CN101237765B - A multi-function car digital instrument system - Google Patents

Abstract

The invention relates to a multifunctional automobile digital instrument system. The system includes a LCD screen and an embedded single-chip microcomputer fixed on the back of the LCD screen. The sensor data is still read through the bus interface of the original analog instrument panel, without changing the installation structure of the original vehicle instrument panel. In addition to all the functions of the car's original analog instrument, the system also has vehicle running status monitoring and fault diagnosis, driver driving status monitoring, vehicle emission status monitoring, vehicle driving recorder, video reversing radar, GPS navigation, GPRS wireless data transmission and other functions. The multifunctional automobile digital instrument system of the present invention can greatly expand the functions of the traditional instrument panel, making it a modern automobile information processing center. The application of this system will help to increase the service life of the vehicle, reduce sudden failures, improve the operation and driving safety of the vehicle, reduce the use and management costs of the vehicle, and realize the informationization of traffic management.

Description

A Multifunctional Automobile Digital Instrument System

technical field

The invention relates to a multifunctional automobile digital instrument system, which belongs to the field of automobile electronic engineering.

Background technique

With the development of the economy, the price of cars will gradually drop, and more and more people will buy cars. The increase of vehicles will lead to an increase in traffic accidents, and the traffic safety situation is very severe. How to ensure the safe operation of vehicles has become a hot spot of concern. Although electronic technology is widely used in vehicles at present, active safety systems such as ABS, parking sensors, infrared anti-collision systems, etc. and passive safety systems such as air bags are widely installed, and the adoption of these technologies has greatly improved driving safety. However, the above technologies cannot eliminate the potential safety hazards caused by sudden car breakdowns, driver fatigue and abnormal driving. At the same time, they cannot monitor the running status of the car and the driving status of the driver. Responsible party. The black box of the car can record the vehicle driving data 20 minutes before the accident, which provides favorable evidence for the correct handling of the traffic accident, but it cannot prevent or control the accident.

Contents of the invention

The purpose of the present invention is to provide a multi-function digital instrument system for automobiles in order to overcome the shortcomings of the existing analog instrument panels of automobiles, such as single function, rigid display, and little information. Vehicle running status monitoring and fault diagnosis, driver driving status monitoring, vehicle driving recorder (black box), video reversing radar, GPS navigation, GPRS wireless data transmission and other functions. The system greatly expands the functions and functions of traditional automotive instruments, and contributes to vehicle operation safety, vehicle driving safety and efficient traffic management.

A kind of multifunctional automobile digital instrument system of the present invention replaces the original analog instrument panel by a high-performance single-chip microcomputer and a liquid crystal screen to display all automobile operating parameters and driver state parameters and has sound and light alarm functions, forming an information technology-based Vehicle operation management system. The system not only has the function of the black box of the car, but also can display the running status of the vehicle in real time, such as cooling water temperature, engine oil temperature, fuel quantity, electricity, engine speed, vehicle speed and other car running status information and the change curve of the above parameters. In addition, during each maintenance, the current total mileage of the vehicle is recorded. When the new cumulative mileage reaches the maintenance mileage interval specified by the manufacturer or user (5000Km or 7500Km or the specified number of kilometers), the total mileage display bar will 64 flashes continuously for 10s, reminding the vehicle to maintain, so that the driver can know the status of the vehicle he is driving, so as to perform technical maintenance on the vehicle on time, which not only improves the life of the vehicle, but more importantly, ensures driving safety. In addition, the system can also monitor the driving state of the driver, and determine the driver's fatigue state and whether it is in an abnormal driving state by analyzing the angular velocity of the steering wheel angle. For drivers whose above parameters exceed the set limits, the system will quickly issue sound and light warnings to slow down or stop. Vehicle speed, for vehicles equipped with electronic accelerator and electronic brake, you can turn off the accelerator and apply the brake.

The system can completely and accurately record the information in the driving state of the car, and can completely record the driving track of the car. In addition to the accident analysis function possessed by the traditional black box, it can also issue an overspeed alarm to remind the driver when the driver is speeding. Slow down, and record in detail the starting time, mileage, driving time, maximum speed and duration of each maximum speed of the vehicle. The system can display the working conditions of the vehicle, conduct self-diagnosis, effectively monitor a series of parameters such as vehicle speed, engine speed, water temperature, oil pressure, fuel volume, fuel consumption and battery voltage, and issue various over-limit alarms through the LCD screen flashing, Effectively prevent and resolve vehicle accidents. The car black box function of the system provides a scientific and authoritative basis for the traffic management department to understand and define the causes of traffic accidents and deal with them fairly. Through continuous recording and analysis of driving speed, braking deceleration, engine temperature, oil pressure, etc., it provides an effective means for timely finding the cause of sudden accidents and reducing vehicle failures, and is helpful for improving vehicle design, reducing costs and Efficient traffic management is of great significance. The multifunctional vehicle digital instrument system will replace the existing monotonous analog instrument panel, and become a vehicle operation safety management system integrating vehicle operation and driving status monitoring and automobile black box, which will greatly improve the driving and driving safety of the vehicle. Provide new means for traffic safety.

In order to achieve the above object, the present invention adopts the following technical solutions. A multifunctional automotive digital instrument system, including an information processing unit 62 and a liquid crystal screen 55 . The sensor signal is input to the information processing unit. The sensor signals include 12 switch signals, 5 analog signals and 3 pulse signals. The 12-way switching signal includes a right turn signal signal 1, a high beam signal 2, a low beam signal 3, an airbag status signal 4, an engine failure status signal 5, a charging status signal 6, a reverse gear signal 7, Parking brake signal 8, automatic anti-lock braking system status signal 9, seat belt status signal 10, left turn signal signal 11, service brake signal 12. The 5-way analog signal is the cooling water temperature signal 17, the engine oil pressure signal 18, the fuel level signal 19, the battery voltage signal 20 and the alcohol sensor signal 21, and the 3-way pulse signal includes the vehicle speed signal 22, the engine speed signal Signal 23 and steering wheel angle signal 24. The 4 road video camera signals are obtained from 4 cameras installed at the rear of the vehicle; the information processing unit 62 includes a pulse signal acquisition module 25, an analog signal acquisition module 26, a video signal acquisition module 27, a switch Signal acquisition module 28, dynamic data storage unit 29, GPS module 31, RS232 serial communication module 44, GPRS module 46, microprocessor 49, CF memory card 51, program code storage unit 61; Described liquid crystal screen 55 is a color liquid crystal screen, embedded in the liquid crystal screen and the liquid crystal screen power drive module 54 that links to each other with microprocessor 49;

The 12-way switching signal is sent to the dynamic data storage unit 29 after being processed by the switching value signal acquisition module 28, and then sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, after being processed by the microprocessor 49 The switching signal of the switch is displayed on the liquid crystal screen 55 in a graphic manner through the liquid crystal screen power drive module 54, and the mode of flashing or lighting indicates that the function works;

The 4-way analog video camera signals are sent to the dynamic data storage unit 29 after being processed by the video signal acquisition module 27, then sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, and processed by the microprocessor 49 The position of the obstacle behind the car is displayed on the liquid crystal screen 55 by the digital video signal of the liquid crystal screen power driver module 54 in a graphical manner;

The 5-way analog signals are sent to the dynamic data storage unit 29 after being processed by the analog signal acquisition module 26, and then sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, and the analog signals processed by the microprocessor 49 The signal displays the cooling water temperature, engine oil pressure, fuel level and battery voltage on the LCD screen 55 through the liquid crystal screen power drive module 54; when the microprocessor 49 judges that the alcohol content exceeds the set value through the alcohol sensor signal, it will drive the alarm The device gives an audible alarm;

The 3-way pulse signal is sent to the dynamic data storage unit 29 after being processed by the pulse signal acquisition module 25, and then sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, and the pulse processed by the microprocessor 49 The signal is displayed on the liquid crystal screen 55 by the power drive module 54 of the liquid crystal screen and the speed of the vehicle and the engine speed;

After the GPS navigation signal 30 from satellite is processed by the GPS module 31, the vehicle speed, time, longitude and latitude data are sent to the microprocessor 49 through the GPS signal output link 32, and the vehicle speed, longitude and latitude after the microprocessor 49 processes Displayed on the electronic map on the liquid crystal screen 55 in a digital or graphical manner by the liquid crystal screen power drive module 54;

The data of 24 sensor signals and GPS navigation signals 30 are stored in the CF memory card 51 through the data exchange link 50 between the CF memory card and the microprocessor after being processed by the microprocessor 49, and then passed through the CF memory card. 51 and the data exchange link 52 between the user's peripherals transmit the data in the instrument panel to the host computer or memory; The analysis and calculation program is sent to the program code storage unit 61 through the microprocessor 49; the peripheral hardware can also send or receive data or codes through the microprocessor 49 through the RS232 serial communication module 44 and the RS232 serial communication link 45;

Instructions from the upper computer platform are transmitted from the GPRS module 46 through the GSM or CDMA mobile public network in the form of short messages or data streams through the input and output signal link 47 between the GPRS module and the upper computer platform, and then passed through the GPRS module and the microcomputer. The input and output signal link 48 between the processors is sent to the microprocessor 49, and the microprocessor 49 performs relevant operations according to the received host computer instructions and sends the specified data to the host computer platform; Remote wireless modification and update of each analysis and control program on the board.

Touch screen 66 is pasted on the described liquid crystal screen 55, and touch screen input system includes touch screen 66, touch screen controller 67; By configuring the coordinates of touch screen 66 and liquid crystal screen 55, realize keystroke command transmission to microprocessor 49; When pressing function When pressing the button 1 or 2 or 3 or 4 or 5, the position coordinates at the button are converted into a digital signal by the touch screen controller 67, and then sent to the microcontroller 49 through the touch screen button signal transmission link 68, and the microcontroller 49 according to the button The position calls the corresponding analysis program, and the corresponding operating parameters are sent to the liquid crystal screen 55 for display.

When the button 3 is pressed, the cooling water temperature signal 17, engine oil pressure signal 18, fuel level signal 19, battery voltage signal 20, vehicle speed signal 22, engine speed signal 23, steering wheel angle signal 24, right turn signal 1. High beam signal 2. Low beam signal 3. Airbag status signal 4. Engine failure status signal 5. Charging status signal 6. Reverse gear status signal 7. Parking brake signal 8. Automatic anti-lock braking system status Signal 9, seat belt status signal 10, left turn signal signal 11 and driving brake signal 12 are processed by corresponding acquisition modules and sent to microprocessor 49. After microprocessor 49 processes these signals, they are processed by microprocessor and liquid crystal. The control data exchange signal link 53 between the screens 55 is displayed on the LCD screen 55 through the LCD screen power drive module 54 .

When the button 1 is pressed, the navigation satellite signal 30 entering the GPS module 31 is sent to the microprocessor 49 through the GPS signal output link 32, and then stored in the program code storage unit through the program code transmission link 34. The navigation map program 37 in 61 is transferred into the microprocessor 49, and realizes the vehicle navigation function by matching the latitude and longitude information in the satellite signal 30 with the digital map.

When the button 2 is pressed: cooling water temperature signal 17, engine oil pressure signal 18, fuel level signal 19, battery voltage signal 20, alcohol sensor signal 21, vehicle speed signal 22, engine speed signal 23, steering wheel angle signal 24 Send into microprocessor 49 after being processed by corresponding collection module respectively, by program code transmission link 34, vehicle state parameter analysis module 35 and driver's driving state analysis module 36 are transferred into microprocessor 49; Vehicle state parameter analysis module 35 pairs Analyze the trend of vehicle speed, engine speed, water temperature, engine oil pressure, battery voltage, etc. within a certain period of time, and calculate the average, maximum, and minimum values of these parameters. If the set limit value is exceeded, the alarm circuit will be driven Send sound and light alarm; driver's driving state analysis module 36 calculates the instantaneous angular acceleration of steering wheel by steering wheel angle signal 24, as exceeding the limit value of setting, then prompt driver's driving state abnormality by sound and light alarm, ignore as driver , the system sends a fuel reduction command to the engine electronic control unit through the control bus to forcibly reduce the speed of the vehicle; the driver's driving state analysis module 36 determines the driver's drinking state based on the output voltage of the alcohol sensor. If the limit value is set, the driver will be reminded that the driver is in the state of drinking and driving through the sound and light alarm;

Microprocessor 49 displays the analysis results of the above-mentioned signals by vehicle state parameter analysis module 35 and driver's driving state analysis module 36 on the liquid crystal screen 55; When the mileage reaches the specified maintenance mileage interval, the total mileage display bar 64 will flash continuously for 10 seconds each time the vehicle is started, prompting the vehicle to be maintained.

When described button 4 is pressed, microprocessor 49 selects the black box status display interface by instrument interface selection program 41, and displays the status signal of strip area around LCD screen by conventional signal display software 42; LCD screen middle area shows black box data and graphic information; the vehicle speed signal 22 is stored in the dynamic data storage unit 29 after the pulse signal acquisition module 25 gathers, and is sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, and the driving brake signal 12 After the switch signal acquisition module 28 gathers, send to microprocessor 49 through the data output link 33 of dynamic data storage unit 29 by dynamic data storage unit; Microprocessor 49 transfers black box data analysis by program code transmission link 34 Program 39 analyzes and processes the received vehicle speed signal 22 and driving brake signal 12 according to the requirements of GB-T19056-2003 national standard for vehicle travel recorders; all black box information is stored by CF under the control of microprocessor 49 The data exchange link 50 between the card and the microprocessor is stored in the CF memory card 51; The black box data is read out and further analyzed and processed on special software to obtain more vehicle operation information.

When the button 5 is pressed or the transmission is in the reverse gear position, the microprocessor 49 receives the reverse gear status signal 7 and calls the instrument interface selection program 41 to select the video reversing radar display interface, and displays the surrounding area of the LCD screen through the conventional signal display software 42 The status signal of the strip area; the image information of the distance and position of the rear of the vehicle displayed from the obstacle in the middle area of the liquid crystal screen; video camera signal 13, video camera signal 14, video camera signal 15, video camera signal 16 through the video signal acquisition module 27 After processing, store in dynamic data storage unit 29, send to microprocessor 49 via the data output link 33 of dynamic data storage unit; Microprocessor 49 transfers camera video signal analysis program 38 by program code transmission link 34 The 4-way video camera signals are digitally filtered, and the image is displayed in the instrument graphic display area 63 on the liquid crystal screen 55 by calling the general video image display software 43 stored in the program code storage unit 61 .

The microprocessor 49 in the information processing unit 62 is an embedded single-chip microcomputer with DSP function, and the information processing unit 62 is embedded with a GPS module and a GPRS module.

The beneficial effect of the present invention is that the function of the traditional analog instrument greatly expanded by the multifunctional digital instrument system based on the high-performance single-chip microcomputer and the liquid crystal screen, from the traditional instrument panel which can only display the state parameters of the vehicle to the one which can display, store and send the vehicle The operation status information, vehicle fault information, emission fault information, driver driving status information, vehicle location information, etc., make the multi-functional digital instrument system become the information center of future vehicles, and provide comprehensive information for safe driving, safe driving, vehicle anti-theft, and vehicles with excessive emissions. It is of great significance to investigate and realize information-based traffic management.

Description of drawings

Fig. 1 schematic diagram of multifunctional digital instrument of the present invention

Figure 2 Schematic diagram of the LCD display area

Fig. 3 LCD display interface of traditional instrument of JEEP 2500 model

Figure 4 Functional display interface of the black box of the multifunctional digital instrument

Figure 5 Multifunctional digital instrument vehicle and driver status analysis display interface

In the figure: 1. Right turn signal signal, 2. High beam signal, 3. Low beam signal, 4. Airbag status signal, 5. Engine failure status signal, 6. Charging status signal, 7. Reverse gear status signal , 8. Parking brake signal, 9. Automatic anti-lock braking system status signal, 10. Seat belt status signal, 11. Left turn signal signal, 12. Driving brake signal, 13. Video camera signal, 14. Video camera Signal, 15. Video camera signal, 16. Road frequency camera signal, 17. Cooling water temperature signal, 18. Engine oil pressure signal, 19. Fuel level signal, 20. Battery voltage signal, 21. Alcohol sensor signal, 22. Vehicle speed Signal, 23, engine speed signal, 24, steering wheel angle signal, 25, pulse signal acquisition module, 26, analog signal acquisition module, 27, video signal acquisition module, 28, switch signal acquisition module, 29, dynamic data storage unit, 30. Navigation satellite signal, 31. GPS module, 32. GPS signal output link, 33. Data output link of dynamic data storage unit, 34. Program code transmission link, 35. Vehicle state parameter analysis program, 36. Driver's driving state analysis program, 37. Navigation map program, 38. Camera video signal analysis program, 39. Black box data analysis program, 40. Host computer communication program, 41. Instrument interface selection program, 42. Conventional signal display software, 43 , video image display software, 44, RS232 serial communication module, 45, RS232 serial communication link, 46, GPRS module, 47, input and output signal link between GPRS module and host computer platform, 48, GPRS module and Input and output signal link between microprocessors (MCU), 49, microprocessor (MCU) 50, data exchange link between CF memory card and microprocessor, 51, CF memory card, 52, CF Data exchange link between memory card and user peripherals, 53. Control data exchange signal link between microprocessor and LCD screen, 54. LCD screen power drive module, 55. LCD screen, 56. Button 1-navigation interface Selection button, 57. Button 2-vehicle and driver state analysis interface selection button, 58. Button 3-traditional instrument display interface selection button, 59. Button 4-black box function interface selection button, 60. Button 5-video reversing radar interface Selection button, 61, program code storage unit, 62, information processing unit, 63, instrument graphic display area, 64, total mileage, 65, single mileage, 66, touch screen, 67, touch screen controller, 68, touch screen Button signal transmission link.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

The system mainly includes sensor signals 1-24 , an information processing unit 62 and a liquid crystal screen 55 . Sensor signals include, 12-way switching signal, namely right turn signal signal 1, high beam signal 2, low beam signal 3, airbag status signal 4, engine failure status signal 5, charging status signal 6, reverse gear signal 7, Parking brake signal 8, automatic anti-lock braking system status signal 9, seat belt status signal 10, left turn signal signal 11, driving brake signal 12, all of which are the original analog instrument panel switch signals; 4 cameras are installed at the rear of the vehicle to obtain 4 video camera signals 13-16 are added signals for this system; 5 analog signals are cooling water temperature signal 17, engine oil pressure signal 18, fuel level signal 19, battery voltage signal 20, alcohol sensor signal 21, of which alcohol The sensor signal 21 is the signal added by the system, and the remaining 4 analog signals are the original analog instrument panel analog signals; 3 pulse signals, the vehicle speed signal 22, the engine speed signal 23 and the steering wheel angle signal 24, wherein the steering wheel angle signal 24 is the signal of the system The added signal, the remaining 2 channels of pulse signals are the original analog instrument panel pulse signals. Information processing unit 62 comprises, pulse signal acquisition module 25, analog signal acquisition module 26, video signal acquisition module 27, switch signal acquisition module 28, dynamic data storage unit 29, GPS module 31, RS232 serial communication module 44, GPRS module 46. Microprocessor (MCU) 49, CF memory card 51, program code storage unit 61. The liquid crystal screen 55 is a high-resolution automobile-specific color liquid crystal screen, and the liquid crystal screen power drive module 54 connected with the microprocessor 49 is embedded in the liquid crystal screen.

The 1-12 switching value signals are sent to the dynamic data storage unit 29 after being processed by the switching value signal acquisition module 28, and then sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, and then sent to the microprocessor 49 through the microprocessor 49 The processed switch signal is graphically displayed on the liquid crystal screen 55 through the liquid crystal screen power drive module 54 , and the function is indicated by the flickering or lighting of the figure.

4 road analog video camera signals 13-16 are sent to dynamic data storage unit 29 after being processed by video signal acquisition module 27, then sent to microprocessor 49 by the data output link 33 of dynamic data storage unit, through microprocessor 49 The processed digital video signal displays the position of the obstacle behind the vehicle on the LCD screen 55 in a graphic manner through the LCD screen power drive module 54 .

The 5-way analog signals 17-21 are sent to the dynamic data storage unit 29 after being processed by the analog signal acquisition module 26, then sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, and processed by the microprocessor 49 The final analog signal is displayed on the LCD screen 55 through the liquid crystal screen power drive module 54 to display the cooling water temperature, engine oil pressure, fuel level and battery voltage. Cooling water temperature, engine oil pressure, fuel level and battery voltage are displayed in digital form, and the display units are ℃, bar, % (volume ratio of fuel remaining to full fuel), V, once the cooling water temperature or (and) When the engine oil pressure or (and) fuel level or (and) battery voltage exceeds the set limit value, the corresponding number will flash on the LCD screen, the more the limit is exceeded, the faster the flashing frequency and a sound prompt will be issued. The alcohol sensor signal 21 shows that the alcohol content exceeds the standard with a sound alarm when the driver carries out the alcohol breath test.

The 3-way pulse signal 22-24 is sent to the dynamic data storage unit 29 after being processed by the pulse signal acquisition module 25, and then sent to the microprocessor 49 through the data output link 33 of the dynamic data storage unit, and processed by the microprocessor 49 The last pulse signal is displayed on the liquid crystal screen 55 by the power drive module 54 of the liquid crystal screen and the speed of the vehicle and the rotational speed of the engine. The vehicle speed and the engine speed are displayed in digital form respectively, and the display units are Km/h and rpm (r/min) respectively. Once the vehicle speed or (and) the engine speed exceeds the set limit value, the corresponding numbers will flash on the LCD screen 55. The more the limit is exceeded, the faster the flashing frequency and a sound prompt will be issued. Steering wheel angle signal 24 is only used when analyzing the driving state of the driver, and is not directly displayed on the LCD screen.

After the GPS navigation signal 30 from satellite is processed by the GPS module 31, the vehicle speed, time, longitude and latitude data are sent to the microprocessor 49 through the GPS signal output link 32, and the vehicle speed, longitude and latitude after the microprocessor 49 processes The electronic map on the liquid crystal screen 55 is displayed digitally or graphically by the liquid crystal screen power drive module 54 to realize vehicle navigation and speed measurement.

The data from signal 1-24 and 30 is stored in the CF memory card 51 through the data exchange link 50 between the CF memory card and the microprocessor after the microprocessor 49 processes, and then through the CF memory card 51 and the The data exchange link 52 between the user peripherals transmits the data in the instrument panel to the upper computer or memory. In addition, the peripheral device (computer) can also send the analysis and calculation program to the program code storage unit 61 through the microprocessor 49 through the data exchange link 52 between the CF memory card 51 and the user's peripheral device. Peripherals can also use the RS232 serial communication module 44 and the RS232 serial communication link 45 to send or receive data or codes through the microprocessor 49 .

Instructions from the upper computer platform (motor vehicle integrated information management center or mobile phone) are transmitted through the GSM or CDMA mobile public network in the form of short messages or data streams through the input and output signal link 47 between the GPRS module and the upper computer platform. The GPRS module 46 is sent to the microprocessor 49 through the input and output signal link 48 between the GPRS module and the microprocessor, and the microprocessor 49 carries out relevant operations according to the received host computer instructions and sends the specified data to the host computer The platform realizes the real-time monitoring of vehicle and driver status information by the host computer platform. In addition, the remote wireless modification and update of each analysis and control program of the instrument panel can be realized through the host computer platform.

Touch screen 66 is pasted on the liquid crystal screen 55, and touch screen input system is made of touch screen 66, touch screen controller 67, micro-controller 49 and corresponding standard software thereof, by configuring the coordinates of touch screen 66 and liquid crystal screen 55, realizes keystroke order transmission to microprocessing device 49. When the function button 1 or 2 or 3 or 4 or 5 is pressed, the position coordinates at the button are converted into digital signals by the touch screen controller 67, and then sent to the microcontroller 49 through the touch screen button signal transmission link 68, and the microcontroller 49 Call the corresponding analysis program according to the position of the key.

Four working modes in this embodiment: the display content of the LCD screen is switched by touching the five function keys 1, 2, 3, 4, and 5 on the LCD screen 55 .

4 working modes of the present embodiment:

1) Traditional instrument interface working mode

After the engine is started, the vehicle key is shifted to the first gear, and the LCD screen displays the traditional instrument panel interface by default, or press button 3, and the position coordinates of the button are converted into digital signals by the touch screen controller 67, and then transmitted through the touch screen button signal The link 68 is sent to the microcontroller 49, and the microcontroller 49 invokes the instrument interface selection program 41 according to the position of the key to enter the traditional instrument interface.

The cooling water temperature signal 17, the engine oil pressure signal 18, the fuel level signal 19, and the battery voltage signal 20 are processed by the analog signal acquisition module 26 and sent to the microprocessor (MCU) 49 through the data output link 33 of the dynamic data storage unit; Vehicle speed signal 22, engine speed signal 23, steering wheel angle signal 24, these signals are sent into microprocessor (MCU) 49 by the data output link 33 of dynamic data storage unit after these signals are processed by pulse signal acquisition module 25; , high beam light signal 2, low beam light signal 3, airbag status signal 4, engine failure status signal 5, charging status signal 6, reverse gear status signal 7, parking brake signal 8, automatic anti-lock braking system status signal 9. Seat belt status signal 10, left turn signal signal 11, driving brake signal 12, these signals are sent to the microprocessor (MCU) 49 by the data output link 33 of the dynamic data storage unit after being shaped by the switch signal acquisition module 28 . After the microprocessor (MCU) 49 processes these signals, the signals are displayed on the LCD screen 55 via the LCD power drive module 54 via the control data exchange signal link 53 between the microprocessor and the LCD screen. Among them, the engine speed and vehicle speed signals are displayed by rotating pointers, the fuel quantity, cooling water temperature, engine oil pressure and battery voltage are displayed by rotating pointers or color bars, and the switching signals are indicated by icons.

The traditional instrument interface of the JEEP 2500 model applied to this system adopts the result of digital display on the LCD screen, as shown in Figure 3. a is the left turn signal light, b is the engine tachometer, c is the fuel gauge, d is the battery voltage indicator bar, e is the high beam light, f is the service brake indicator light, g is the parking brake indicator light, and h is the charging indicator Indicator light, i is ABS fault light, j is total mileage, k is single mileage, l is reverse gear signal, m is single driving time, n is four-wheel drive indicator, o is airbag status, p is engine Fault prompt, q is the oil pressure indicator bar, r is the cooling water temperature indicator bar, s is the speedometer, t is the right turn signal light.

2) Vehicle navigation mode

Including all signals of mode 1, except that these signals are displayed around the LCD screen and some signals are displayed digitally. In addition, the mode 2 also includes a GPS module 31 , a navigation satellite signal 30 , a program code storage unit 61 , and a navigation map program 37 .

Press the button 1, the position coordinates of the button are converted into digital signals by the touch screen controller 67, and then sent to the microcontroller 49 through the touch screen button signal transmission link 68, and the microcontroller 49 invokes the instrument interface selection program according to the position of the button 41 Select the navigation state display interface, and display the state signals in the bar-shaped areas around the liquid crystal screen through the conventional signal display software 42 . The middle area of the LCD screen displays the map and the driving route of the vehicle and provides voice prompts for the driving route. The navigation satellite signal 30 that enters GPS module 31 is sent into microprocessor (MCU) 49 by GPS signal output link 32, and the navigation map program 37 that is stored in the program code memory unit 61 is stored in program code transmission link 34 The microprocessor (MCU) 49 is transferred to realize the vehicle navigation function by matching the latitude and longitude information in the satellite signal 30 with the digital map.

3) Black box interface working mode

Mode 3 includes all signals of mode 1, except that these signals are displayed around the LCD screen and some signals are displayed digitally.

Press the button 4, the position coordinates at the button are converted into digital signals by the touch screen controller 67, and then sent to the microcontroller 49 through the touch screen button signal transmission link 68, and the microcontroller 49 invokes the instrument interface selection program according to the position of the button 41 Select the black box state display interface, and display the state signals in the bar area around the liquid crystal screen through the conventional signal display software 42, as shown in FIG. 4 . The middle area of the LCD screen displays black box data and graphic information. The vehicle speed signal 22 is stored in the dynamic data storage unit 29 after the pulse signal acquisition module 25 gathers, and is sent to the microprocessor (MCU) 49 through the data output link 33 of the dynamic data storage unit, and the service brake signal 12 is passed through After the switch signal acquisition module 28 collects, it is sent to the microprocessor (MCU) 49 through the dynamic data storage unit 29 via the data output link 33 of the dynamic data storage unit. Microprocessor (MCU) 49 transfers black box data analysis program 39 to receiving vehicle speed signal 22 and driving brake signal 12 through program code transmission link 34, analyzes according to the requirement of GB-T19056-2003 national standard for automobile travel recorder and processing, part of the processing results are shown in Figure 4. The first line displays the instantaneous vehicle speed value recorded every 0.2s, and the vehicle speed change during this driving time can be observed by pulling the scroll bar; the second line records the vehicle starting time, stop time, current time and current driving time of this driving mileage; the lower left box is the speeding record of this trip, which records the speed, start time and stop time of 5 times of speeding; the lower right box is the record of the use of running lights, and only the left turn signal 2 was used in this trip Second-rate.

4) Working mode of vehicle and driver status analysis interface

Mode 4 includes all signals of mode 1, except that these signals are displayed around the LCD screen and some signals are displayed digitally.

Press the key 2, the position coordinates at the key are converted into digital signals by the touch screen controller 67, and then sent to the microcontroller 49 through the touch screen key signal transmission link 68, and the microcontroller 49 calls the instrument interface selection program according to the position of the key 41 Select the vehicle and driver state analysis interface, and display the state signals in the bar-shaped areas around the LCD screen through the conventional signal display software 42, as shown in Figure 5. In this example, only the change curve of vehicle speed with time is displayed in the middle area of the LCD screen (the curves of oil pressure and water temperature can also be displayed), indicating that the vehicle speed increases from 20Km/h to 140Km/h within 250s, and between 70-100s and 160-210s Overspeeding in the interval, the vehicle speed dropped to 80Km/h at 250s.

The cooling water temperature signal 17, engine oil pressure signal 18, fuel level signal 19, battery voltage signal 20 and alcohol sensor signal 21 are processed by the analog signal acquisition module 26 and sent to the microprocessor through the data output link 33 of the dynamic data storage unit (MCU) 49; Vehicle speed signal 22, engine speed signal 23, steering wheel angle signal 24 are sent into microprocessor (MCU) 49 by the data output link 33 of dynamic data storage unit after pulse signal acquisition module 25 processes, pass program code The transmission link 34 transfers the vehicle state parameter analysis program 35 and the driver's driving state analysis program 36 into a microprocessor (MCU) 49 . The vehicle state parameter analysis program 35 analyzes the trend of vehicle speed, engine speed, water temperature, engine oil pressure, battery voltage, etc. over time within a certain period of time, and calculates the average value, maximum value, and minimum value of these parameter changes. If the limit value is exceeded, an audible and visual alarm will be issued. If the vehicle speed is lower than the minimum value of the gear, the driver will be prompted to switch into a resisting gear; if the vehicle speed is higher than the maximum value of the gear, the driver will be prompted to switch into a high gear; when the cooling water temperature exceeds the set limit value, it will be prompted to cool down System fault detection. The driver's driving state analysis program 36 calculates the instantaneous angular acceleration of the steering wheel based on the steering wheel angle signal 24. If it exceeds the set limit value, the driver's driving state is abnormally prompted by an audible and visual alarm; the driver's driving state analysis program 36 is based on the alcohol sensor. Output voltage to determine the driver's drinking status. If the output voltage value of the alcohol sensor exceeds the set limit, the driver will be prompted to be in a drinking and driving state through an audible and visual alarm.

The microprocessor (MCU) 49 invokes the vehicle state parameter analysis program 35 and the driver's driving state analysis program 36 to analyze the results of these signals, and display the prompts and suggestions of the vehicle running state and driving state in graphics, data, voice, etc. on the LCD screen 55. The maintenance time is displayed in a countdown mode. If it is overdue, it will first display "It's time for maintenance!" for 5 seconds every time it is started, and then enter the instrument interface.

5) Video reversing radar

Press the button 5 or the speed changer is in the reverse gear position (the reverse gear status signal indicator icon flashes), the microprocessor (MCU) 49 receives the reverse gear status signal 7 and calls the instrument interface selection program 41 to select the video reversing radar display interface, through the conventional signal The display software 42 displays the status signals of the bar-shaped areas around the liquid crystal screen, as shown in FIG. 2 . The middle area of the LCD screen displays image information of the distance and position of the rear of the vehicle from obstacles. After video camera signal 13, video camera signal 14, video camera signal 15, frequency camera signal 16 are processed in video signal acquisition module 27, store in dynamic data storage unit 29, pass through the data output link 33 of dynamic data storage unit Sent to the microprocessor (MCU) 49. Microprocessor (MCU) 49 transfers camera video signal analysis program 38 through program code transmission link 34 and these 4 road video camera signals are digitally filtered, and by calling the general video image display stored in program code storage unit 61 The software 43 displays the image in the instrument graphic display area 63 on the liquid crystal screen 55 .

There are two data communication methods in this embodiment: wired communication and wireless communication

1) Wired communication: read out the black box data stored on the CF memory card 51 through the data exchange link 52 between the CF memory card and the user's peripherals or pass the data and programs in the peripherals through the data exchange link 52 to the CF memory card 51. Peripherals are connected to instrument panel information processing unit 62 through RS232 serial communication module 44, and data and codes in peripherals are transmitted to microprocessor (MCU) 49 through RS232 serial communication link 45, and then by microprocessor 49 Stored in the program code storage unit 61 through the program code transmission link 34. On the contrary, the dynamic data in the microprocessor 49 and the program code and data in the information processing unit 62 can be transmitted to the peripheral device through the serial port 44 .

2) Wireless communication: the microprocessor 49 passes information such as the relevant vehicle running state, driver's driving state, black box, navigation, etc. in the instrument panel information processing unit 62 through the input and output signal chain between the GPRS module and the microprocessor (MCU) Road 48 transmits to GPRS module 46, then sends to upper computer platform (motor vehicle comprehensive information management center) based on mobile public network GSM or CDMA with the form of short message or data stream by the wireless sending port of GPRS module 46; Otherwise, upper computer platform Commands and data can be sent to the GPRS module 46 in the form of short messages or data streams based on the mobile public network GSM or CDMA, and then sent to the microprocessor through the input and output signal link 48 between the GPRS module and the microprocessor (MCU) 49, and can realize the remote wireless modification and update of the code and data in the program code storage unit 61, thereby realizing the wireless monitoring and control of the vehicle running state and the driver's driving state information. Status information includes direct and processed sensor information from sensors 1-24 as well as ECU fault and emissions fault messages sent from the engine computer to the dashboard.

For steps 2), 3), 4) and 5), that is, vehicle navigation, vehicle and driver status analysis, black box and video reversing radar mode, the left turn signal signal 11, cooling water temperature signal 17, Engine oil pressure signal 18, vehicle speed signal 22, engine speed signal 23, fuel level signal 19, battery voltage signal 20, right turn signal signal 1; the bar-shaped area on the left side of the LCD screen displays high beam signal 2, low beam signal 3, Airbag status signal 4, engine failure status signal 5, charging status signal 6; reverse gear status signal 7, parking brake signal 8, automatic anti-lock braking system status signal 9, seat belt status signal displayed in the bar-shaped area on the right side of the LCD screen 10. Driving brake signal 12; total mileage displayed in the strip area below the LCD screen 64, navigation interface selection button 56, vehicle and driver status analysis interface selection button 57, traditional instrument display interface selection button 58, black box function interface selection button 59. The video reversing radar interface selection button 60, single mileage 65.

Working principle of the present invention: the multifunctional digital instrument system includes a liquid crystal screen and an embedded single-chip microcomputer fixed on the back of the liquid crystal screen, and the sensor data is still read through the bus interface of the original analog instrument panel, without changing the installation of the original vehicle instrument panel structure. Based on the selection results of the navigation interface selection button 56, the vehicle and driver state analysis interface selection button 57, the traditional instrument display interface selection button 58, the black box function interface selection button 59, and the video reversing radar interface selection button 60, the microprocessor (MCU) 49 reads the corresponding sensor data and transfers the corresponding analysis program from the program code storage unit 61, so that the instrument is in the traditional instrument display interface or vehicle and driver status analysis interface or navigation interface or video reversing radar interface or black box function interface. Any interface display form retains all the information of the traditional instrument interface, but the display mode of some information is changed from analog graphic display to digital display. All the information displayed on the LCD screen and stored in the CF card can be sent to the upper computer platform - the motor vehicle comprehensive information management center through the mobile public network in the form of text messages or data streams, so as to realize the monitoring of motor vehicle running status, driving status, emission Comprehensive monitoring of status, security status, and more.

The results of the above examples show that the multi-functional vehicle digital instrument system of the present invention can greatly expand the functions of the traditional instrument panel, making it a modern vehicle information processing center. The application of this system will help to increase the service life of the vehicle, reduce sudden failures, improve the operation and driving safety of the vehicle, reduce the use and management costs of the vehicle, and realize the informationization of traffic management.

Claims (7)

1. a multi-function car digital instrument system is characterized in that: comprise information process unit (62) and liquid crystal display screen (55); Sensor signal inputs to information process unit, described sensor signal includes 12 way switch amount signals, 5 tunnel analog signals and 3 road pulse signals, described 12 way switch amount signals include right turn modulating signal (1), high beam signal (2), dipped headlights signal (3), air bag status signal (4), engine failure status signal (5), charged state signal (6), signal (7) reverses gear, parking brake signals (8), automatic anti-lock braking system status signal (9), seat belt status signal (10), left steering modulating signal (11) and service brake signal (12); Described 5 tunnel analog signals include cooling water temperature signal (17), engine oil pressure signal (18), fuel level signal (19), battery tension signal (20) and alcohol sensor signal (21); Described 3 road pulse signals include vehicle speed signal (22), engine rotational speed signal (23) and steering wheel angle signal (24); 4 cameras that 4 road video frequency pick-up head signals are installed from the vehicle afterbody obtain; Described information process unit (62) comprises pulse signal acquisition module (25), collection of simulant signal module (26), video signal collective module (27), switch signal acquisition module (28), dynamic data memory cell (29), GPS module (31), RS232 serial communication module (44), GPRS module (46), microprocessor (49), CF storage card (51), program code memory cell (61); Described liquid crystal display screen (55) is a color LCD screen, and liquid crystal display screen is embedded in the liquid crystal display screen power driver module (54) that links to each other with microprocessor (49);

12 way switch amount signals are delivered to dynamic data memory cell (29) after switching value signal acquisition module (28) is handled, deliver to microprocessor (49) by the data output link (33) of dynamic data memory cell again, switching value signal after microprocessor (49) is handled is presented on the liquid crystal display screen (55) by the mode of liquid crystal display screen power driver module (54) with figure, glimmers or the mode lighted shows this function operation by figure;

4 road analog video camera signals are delivered to dynamic data memory cell (29) after video signal collective module (27) is handled, deliver to microprocessor (49) by the data output link (33) of dynamic data memory cell again, the digital video signal after microprocessor (49) is handled by liquid crystal display screen power driver module (54) with the mode of figure the position display of car and obstruction on liquid crystal display screen (55);

5 tunnel analog signals are delivered to dynamic data memory cell (29) after collection of simulant signal module (26) is handled, deliver to microprocessor (49) by the data output link (33) of dynamic data memory cell again, the analog signal after microprocessor (49) is handled is presented at cooling water temperature, engine oil pressure, fuel level and battery tension on the liquid crystal display screen (55) by liquid crystal display screen power driver module (54); When microprocessor (49) exceeds standard above set point by alcohol sensor signal determining alcohol content, drive warning device and carry out audible alarm;

3 road pulse signals (22-24) are delivered to dynamic data memory cell (29) after pulse signal acquisition module (25) is handled, deliver to microprocessor (49) by the data output link (33) of dynamic data memory cell again, the pulse signal after microprocessor (49) is handled is presented at the speed of a motor vehicle and engine speed on the liquid crystal display screen (55) by liquid crystal display screen power driver module (54);

From Satellite GPS navigation signal (30) after GPS module (31) is handled, the speed of a motor vehicle, time, longitude and latitude data are delivered to microprocessor (49) by gps signal output link (32), and the speed of a motor vehicle, longitude and the latitude after microprocessor (49) is handled is presented on the electronic chart on the liquid crystal display screen (55) in the mode of numeral or figure by liquid crystal display screen power driver module (54);

The data of 24 tunnel sensor signals and GPS navigation signal (30) are handled the back through microprocessor (49) and are stored in the CF storage card (51) by the exchanges data link (50) between CF storage card and microprocessor, pass through again exchanges data link (52) between CF storage card (51) and user's peripheral hardware the transfer of data in the instrument board in host computer or memory; Peripheral hardware also can be delivered to program code memory cell (61) to analysis and calculation procedure by microprocessor (49) by the exchanges data link (52) between CF storage card (51) and user's peripheral hardware; Peripheral hardware can also pass through RS232 serial communication module (44) and RS232 serial communication link (45), sends or receive data or code by microprocessor (49);

Move public network in the mode of note or data flow through GSM or CDMA from the instruction of host computer platform, by the input and output signal link (47) between GPRS module and host computer platform, transmission is from GPRS module (46), deliver to microprocessor (49) by the input and output signal link (48) between GPRS module and microprocessor again, microprocessor (49) carries out associative operation according to the host computer instruction that receives data designated is sent to host computer platform; By host computer platform the long distance wireless of each analysis of instrument board and control program is revised and renewal.

Post touch-screen (66) on the described liquid crystal display screen (55), the touch-screen input system includes touch-screen (66), touch screen controller (67); By the coordinate of configuration touch-screen (66), realize that key commands is transferred to microprocessor (49) with liquid crystal display screen (55); When pressing function button 1 or 2 or 3 or 4 or 5, the position coordinates at button place is after touch screen controller (67) converts digital signal to, deliver to microcontroller (49) by touch-screen push button signalling transmission link (68), microcontroller (49) is delivered to liquid crystal display screen (55) with corresponding operational factor and is shown according to the corresponding routine analyzer of the call by location of this button.

2. a kind of multi-function car digital instrument system according to claim 1, it is characterized in that: when described button 3 is pressed, cooling water temperature signal (17), engine oil pressure signal (18), fuel level signal (19), battery tension signal (20), vehicle speed signal (22), engine rotational speed signal (23), steering wheel angle signal (24), right turn modulating signal (1), high beam signal (2), dipped headlights signal (3), air bag status signal (4), engine failure status signal (5), charged state signal (6), status signal (7) reverses gear, parking brake signals (8), automatic anti-lock braking system status signal (9), seat belt status signal (10), left steering modulating signal (11) and service brake signal (12) are delivered to microprocessor (49) after handling by corresponding acquisition module, microprocessor (49) these signals are handled after between microprocessor and liquid crystal display screen (55) control data switching signal link (53) be presented on the liquid crystal display screen (55) by liquid crystal display screen power driver module (54).

3. a kind of multi-function car digital instrument system according to claim 1, it is characterized in that: when described button 1 is pressed, the navigation satellite signal (30) that will enter GPS module (31) by gps signal output link (32) is sent into microprocessor (49), the navigation map program (37) that will be stored in the program code memory cell (61) by program code transmission link (34) is called in microprocessor (49) again, by matching operation, realize the automobile navigation function with the latitude in the satellite-signal (30) and longitude information and numerical map.

4. a kind of multi-function car digital instrument system according to claim 1 is characterized in that: when described button 2 is pressed; Cooling water temperature signal (17), engine oil pressure signal (18), fuel level signal (19), battery tension signal (20) and alcohol sensor signal (21), vehicle speed signal (22), engine rotational speed signal (23), steering wheel angle signal (24) are sent into microprocessor (49) after handling through corresponding acquisition module respectively, by program code transmission link (34) vehicle-state parameter analysis module (35) and driver's driving condition analysis module (36) are called in microprocessor (49); Vehicle-state parameter analysis module (35) is analyzed the speed of a motor vehicle in the certain hour section, engine speed, water temperature, engine oil pressure, the time dependent trend of battery tension, calculate mean value, maximum, minimum value that these parameters change, the limit value that surpasses setting then drives warning circuit and sends sound and light alarm; Driver's driving condition analysis module (36) is by the intermittent angle acceleration of steering wheel angle signal (24) calculated direction dish, as surpassing the limit value of setting, then unusual by sound and light alarm prompting driver driving condition, ignore as the driver, then system sends to engine electric-controlled unit by control bus and subtracts the oil instruction, reduces the speed of a motor vehicle by force; Driver's driving condition analysis module (36) is determined driver's the state of drinking based on the output voltage of alcohol sensor, surpasses the limit value of setting as the output voltage values of alcohol sensor, then is in the driver from drunk driving state by sound and light alarm prompting driver;

Microprocessor (49) to the analysis result of above-mentioned signal, is presented at vehicle-state parameter analysis module (35) and driver's driving condition analysis module (36) on the liquid crystal display screen (55); Microprocessor (49) record current vehicles total kilometres, the service cycle that reaches appointment when new accumulation distance travelled at interval, total kilometrage show bar (64) glimmered 10 seconds continuously behind then each vehicle launch, the prompting vehicle maintains.

5. a kind of multi-function car digital instrument system according to claim 1, it is characterized in that: when described button 4 is pressed, microprocessor (49) is selected the black box status display interface by instrument interface option program (41), shows the liquid crystal display screen status signal of bar-shaped zone all around by normal signal software for display (42); The liquid crystal display screen zone line shows black box data and graphical information; Vehicle speed signal (22) is after pulse signal acquisition module (25) is gathered, be stored in dynamic data memory cell (29), data output link (33) via the dynamic data memory cell is delivered to microprocessor (49), service brake signal (12) is delivered to microprocessor (49) by dynamic data memory cell (29) via the data output link (33) of dynamic data memory cell after switch signal acquisition module (28) is gathered; Microprocessor (49) calls vehicle speed signal (22) and the service brake signal (12) of black box data routine analyzer (39) to receiving by program code transmission link (34), analyzes and handles according to GB-T19056-2003 automobile travel recorder request of national standard; All black box information are stored in the CF storage card (51) by the exchanges data link (50) between CF storage card and microprocessor under the control of microprocessor (49); The user reads and further analyzes on special-purpose software and handle to obtain more vehicle operating information by the black box data that the exchanges data link (52) between CF storage card and user's peripheral hardware will be stored on the CF storage card (51).

6. a kind of multi-function car digital instrument system according to claim 1, it is characterized in that: described button 5 is pressed or speed changer is in when reversing gear the position, microprocessor (49) receives and reverses gear status signal (7) and call instrument interface option program (41) selection video backing radar display interface, shows the liquid crystal display screen status signal of bar-shaped zone all around by normal signal software for display (42); The liquid crystal display screen zone line shows that the vehicle afterbody is apart from the distance of barrier and the image information of position; Video frequency pick-up head signal (13), video frequency pick-up head signal (14), video frequency pick-up head signal (15), frequency camera signals (16) are after video signal collective module (27) is handled, be stored in dynamic data memory cell (29), deliver to microprocessor (49) via the data output link (33) of dynamic data memory cell; Microprocessor (49) calls camera video signal analysis program (38) by program code transmission link (34) this 4 road video frequency pick-up head signal is carried out digital filtering, and by calling the generic video image software for display (43) that is stored in the program code memory cell (61) this image is presented in the instrument graphical display area (63) on the liquid crystal display screen (55).

7. according to the described a kind of multi-function car digital instrument system of claim 1, it is characterized in that: the microprocessor (49) in the described information process unit (62) is the embedded scm of band DSP function, and information process unit (62) is embedded in GPS module and GPRS module.

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