CN101201619A - General module for bus vehicle mounted network and information integration control system - Google Patents

Abstract

The invention discloses a general-purpose module used in an on-board network and information integrated control system of a passenger car, including a microcontroller, CAN communication, frequency quantity collection, analog quantity collection, switch quantity collection, resistive load drive, and inductive load drive , power supply and reset circuit; the microcontroller is connected to the output terminals of the eight circuits respectively through its data bus; the CAN communication circuit receives the switch quantity acquisition circuit, the frequency quantity acquisition circuit and the analog quantity acquisition circuit from the sending module through the CAN bus The control signal and related information are processed by the microcontroller to form control information, which is sent to the receiving module through the CAN bus to make the resistive load drive circuit and the inductive load drive circuit operate. This module is universal, easy to debug and maintain, and reduces the overall cost; it can meet the needs of the on-board network system of ordinary buses and realize personalized customization; it realizes bus-based control, high reliability, and the scalability of system functions has been enhanced. .

Description

General-purpose module used in bus on-board network and information integrated control system

technical field

The invention belongs to the field of automotive electronics, in particular to a general-purpose module used in a vehicle-mounted network and information integrated control system.

Background technique

With the improvement of people's requirements for the power, safety and comfort of passenger cars, the ECU (Electronic Control Unit, electronic control unit) and electronic control devices of passenger cars are also increasing. The traditional point-to-point communication method can no longer meet the distributed real-time control of automobiles. need. The geometric growth of the number of wires due to the continuous increase of electronic equipment also makes it more and more difficult to wire in the limited space in the car, which limits the further expansion of the internal control function of the bus. On the other hand, the bus ECU is not simply connected to the load equipment, but more to exchange information with peripheral equipment and other ECUs, and issue control commands through complex control decision-making calculations. In order to improve the utilization rate of signals, a large amount of data information is required to be exchanged and shared among different bus ECUs. Therefore, the adoption of in-vehicle network and information integration technology is an inevitable trend in the development of automotive electronics.

Bus on-board network and information integrated control system is a control system that uses modern electronic information technology to improve the safety and comfort of passenger cars. It uses bus control technology to eliminate the constraints brought by traditional passenger car electronic control systems. , Improve performance and reduce the bottleneck of overall cost, use software control instead of direct wiring harness control, greatly improve reliability, and the system function expansion is not limited.

With the development of the bus network and information integration control system and the continuous expansion of the application range, the loading of the vehicle network and information integration system on high-end buses and high-end tourist coaches is increasing, but there are generally many modules in the system, The main reason for problems such as high price and high module maintenance and repair costs is that the modules have not adopted a standardized and generalized design scheme, resulting in a wide variety of modules with specific functions and cannot be interchanged.

The Chinese patent "Passenger Car Network Control System" (publication number CN 2810051) discloses a vehicle-mounted network control system aimed at improving the driving safety and comfort of passenger cars, including a front light control unit, a rear light control unit, an engine signal unit, Instrument display unit and central control unit. The Chinese patent "Vehicle Network Diagnosis System and Its Vehicle Control Device" (publication number CN 1945257) discloses a vehicle control device that uses multiple electronic control devices to realize the diagnosis and control of the vehicle network, including numbers 10-14, 20- 21, 30, 40, 130 and other electronic control devices. The article "Research and Design of Automobile Body Control System Based on CAN Bus" in the "China Excellent Ph.D. Design. The disadvantage of the above technologies is that the control modules in the vehicle network system have not been standardized and generalized, and the number of control modules is large, and the overall cost is high, which is not conducive to the popularization of the vehicle network technology.

Contents of the invention

The technical problem to be solved by the present invention is to provide a generalized module in the bus on-board network and information integrated control system that can realize standardization and generalization, so as to overcome the deficiencies of the existing bus on-board network and information integrated control system.

The technical solution adopted by the present invention to solve the technical problem is: including CAN (Controller Area Network, controller local area network) communication circuit, frequency quantity acquisition circuit, analog quantity acquisition circuit, switch quantity acquisition circuit, resistive load drive circuit, inductive load drive Circuit, power circuit and reset circuit, CAN is the English abbreviation of "Controller Area Network". It also includes a microcontroller, which is respectively connected to the output ends of the eight circuits through its data bus; the CAN communication circuit receives the switch quantity acquisition circuit, the frequency quantity acquisition circuit and the analog quantity acquisition circuit from the sending module through the CAN bus The control signal and related information of the circuit are processed by the microcontroller to form control information, which is sent to the receiving module through the CAN bus to drive the corresponding resistive load drive circuit and inductive load drive circuit.

Because the present invention applies the universal design scheme to the vehicle-mounted network information integration system, it is especially suitable for urban high-level buses and high-level tourist buses. Therefore compared with the prior art, it has the following main advantages:

(1) The control module of the bus on-board network system is universal, which is convenient for debugging and maintenance, and reduces the overall cost; (2) Meets the needs of ordinary bus on-board network systems, and can realize personalized customization; (3) Realize bus Control, the reliability of control has been improved, and the scalability of system functions has been enhanced.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a diagram of a resistive load driving circuit in FIG. 1 .

Fig. 3 is a circuit diagram of switching value detection in Fig. 1 .

FIG. 4 is a diagram of the inductive load driving circuit in FIG. 1 .

FIG. 5 is the power circuit selection strategy in FIG. 1 .

Detailed ways

The present invention is a device composed of a microcontroller, a CAN communication circuit, a frequency quantity acquisition circuit, an analog quantity acquisition circuit, a switch quantity acquisition circuit, a resistive load drive circuit, an inductive load drive circuit, a power supply circuit and a reset circuit. It is a general module used in the bus on-board network and information integrated control system (see Figure 1). The microcontroller adopts a 16-bit single-chip microcomputer, which integrates a CAN controller and has 16 A/D conversion channels with 8-bit precision and a programmable frequency acquisition channel. The data bus of the controller is connected with the analog quantity acquisition circuit and the frequency quantity acquisition circuit. The CAN communication circuit receives the control signals and related information from the switching quantity acquisition circuit, frequency quantity acquisition circuit and analog quantity acquisition circuit of the sending module through the CAN bus, and forms control information after being processed by the microcontroller, and sends it to the receiving module through the CAN bus. Drive the corresponding resistive load drive circuit and inductive load drive circuit to act. The CAN controller of the CAN communication circuit is realized by the CAN controller integrated in the microcontroller, and the analog quantity and frequency quantity collection are respectively realized by the analog quantity collection input interface and the frequency quantity collection input interface integrated in the microcontroller.

The present invention will be described in further detail below in conjunction with the accompanying drawings, but the present invention is not limited.

The core component of the resistive load drive circuit in the present invention is the power drive chip UP1, which can use MC33286 or other similar chips. See Figure 2: the control signal input pins are A3 (IN1) and A4 (IN2); the power output pins are A7 (OUT1) and A8 (OUT2); the output status feedback pins are A2 (CUR R) and A5 ( STATUS); chip ground pin is A1 (GND); chip power pin is A6 (VBAT). The A7 and A8 pins of the power driver chip UP1 are used to connect the resistive load; the A3 and A4 pins are respectively connected to the I/O port PA0 and PA1 pins of the microcontroller; the A2 and A5 pins are respectively connected to the microcontroller’s The I/O port PB0 is connected to the analog quantity acquisition port AN01; the A6 pin is connected to the positive terminal VPWR of the vehicle power supply; the A1 pin is connected to the +5V power supply ground; the resistor R1 is a pull-down resistor, connected to the A2 pin of UP1 and then connected to + 5V power supply ground GND; R2 is a pull-up resistor, connected to the A5 pin of UP1 and then connected to +5V power supply VDD; C1 is a filter capacitor, connected between the positive terminal VPWR of the car power supply and the negative terminal VPWR- of the car power supply.

The switch detection circuit in the utility model can be composed of a switch value detection chip UP3 and its peripheral circuits. UP3 is the core component of the circuit, and it can use MC33993 or other similar chips. See Figure 3: UP3 includes 4 programmable switch detection ports and 8 low-end switch detection ports, of which 4 programmable switch detection ports are set as high-end switch access through software, and the switch detection chip and the microcontroller pass through SPI communication interface communication. The high-end switch signal SH0 is connected to the programmable switch detection port X6 of the switch detection chip UP3 after being stepped down by the resistor RP1. The diode D1 is used to limit the level input to the X6 port. And connected between the X6 port and the +5V power ground GND for filtering; the low-end switch signal SL0 is connected to the switch value detection port X7 of the switch value detection chip, and the capacitor C4 is parallel connected between the X7 port and the +5V power ground GND Between, used for filtering; the switching value detection chip UP3 communicates with the microcontroller through the SPI communication interface, and the related pins are X2, X3, X4 and X5; the X9 pin of the switching value detection chip UP3 is an analog multiple output pin , connected to the analog input interface AN03 of the microcontroller, and grounded through the capacitor C5; the X10 pin is the interrupt signal output pin, connected to the I/O port PA6 of the microcontroller; C6 is the filter capacitor, connected to the car power supply Between the positive terminal VPWR and the negative terminal VPWR- of the car power supply.

The core component of the inductive load drive circuit in the present invention is the power drive chip UP2, which can adopt the MC33887 model or other similar chips. See Figure 4: The control signal input pins are B3 (IN1) and B4 (IN2); the power output pins are B10 (OUT1) and B11 (OUT2); the power output control pins are B5 (D1) and B6 (D2) ; The output state feedback pins are B2 (/FS) and B8 (FB); the chip power pin is B7 (V+); the chip ground pin is B9 (PGND); the charge pump pin is B12 (CCP); the chip uses The energy output pin is B13 (EN); the chip cooling pin is B14 (TAB). The B10 and B11 pins of the power driver chip UP2 are used to connect inductive loads; the B3 and B4 pins are respectively connected to the I/O ports PA2 and PA3 of the microcontroller; the B5 pin is connected to the I/O port PA5 of the microcontroller ; B6 pin is connected to +5V power supply; A2 and A8 pins are respectively connected to the I/O port PB1 of the microcontroller and the analog input interface AN02, and the resistor R4 and pole are connected in parallel between the B8 pin and the +5V power supply ground GND The positive capacitor CE1 is used for filtering; the B7 pin is connected to the positive terminal VPWR of the vehicle power supply; the B12 pin is connected to the +5V power supply ground GND through the capacitor C2; CE2 is a filter capacitor, connected to the positive terminal VPWR of the vehicle power supply and the negative terminal VPWR of the vehicle power supply -between.

In Figure 5, the general module parses the information message of switching on or off the main power switch received from the CAN bus. If the main power switch is turned on (logic "1"), it is enabled to connect to the working power supply and the normal power supply. The output of the power chip of the load; if the main power switch is off (logic "0"), the output of the power chip connected to the normally-on power supply load is enabled.

In the general module provided by the present invention, its normal working power supply can be provided by a power supply circuit and a reset circuit to provide a +5 volt regulated power supply and a +5 volt isolated regulated power supply.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (10)

1. the general module that is used for bus carried network and information integration control system, comprise CAN telecommunication circuit, frequency quantity Acquisition Circuit, analog acquisition circuit, switch acquisition circuit, resistive load driving circuit, Perceptual Load Drive Circuit, power circuit and reset circuit, CAN is the english abbreviation of " controller local area network ", it is characterized in that also comprising microcontroller, this microcontroller links to each other with the output terminal of described eight circuit respectively by its data bus; The CAN telecommunication circuit is by control signal and the relevant information of CAN bus reception from switch acquisition circuit, frequency quantity Acquisition Circuit and the analog acquisition circuit of sending module, handle the back by microcontroller and form control information, send to receiver module by the CAN bus, drive the action of corresponding resistive load driving circuit and Perceptual Load Drive Circuit.

2. require described general module as right 1, it is characterized in that: microcontroller adopts 16 single-chip microcomputers.

3. require described general module as right 2, it is characterized in that: in the inside of microcontroller, be integrated with the CAN controller, and have 16 tunnel 8 accuracy A/D ALT-CH alternate channels and programmable frequency quantity acquisition channel.

4. general module as claimed in claim 3 is characterized in that: the A/D ALT-CH alternate channel links to each other with the frequency quantity Acquisition Circuit with the analog acquisition circuit by the data bus of microcontroller respectively with the frequency quantity acquisition channel.

5. require described general module as right 1, it is characterized in that: the core parts of resistive load driving circuit are power drive chip UP1, the control signal input pin is A3 and A4, the power output pin is A7 and A8, the output state feedback pin is A2 and A5, the chip grounding pin is A1, and the chip power pin is A6;

The annexation of each pin of UP1 is: A7 and A8 pin are used to connect resistive load; A3 links to each other with the PA1 pin with micro controller I/O mouth PA0 respectively with the A4 pin; A2 links to each other with analog acquisition mouth AN01 with micro controller I/O mouth PB0 respectively with the A5 pin; The A6 pin links to each other with automobile power source anode VPWR; The A1 pin links to each other with+5V power supply ground; Resistance R 1 is a pull down resistor, and connects+5V power supply ground GND after the A2 pin of UP1 links to each other; R2 is a pull-up resistor, and connects+5V power vd D after the A5 pin of UP1 links to each other; Filter capacitor C1 is connected between automobile power source anode VPWR and the automobile power source negative terminal VPWR-.

6. require described general module as right 1, it is characterized in that: the core parts of Perceptual Load Drive Circuit are power drive chip UP2, the control signal input pin is B3 and B4, and the power output pin is B10 and B11, and power output control pin is B5 and B6, the output state feedback pin is B2 and B8, the chip power pin is B7, and the chip grounding pin is B9, and the charge pump pin is B12, the chip enable output pin is B13, and the chip cooling pin is B14;

The annexation of each pin of UP2 is: B10 and B11 pin are used to connect inductive load; B3 links to each other with PA3 with micro controller I/O mouth PA2 respectively with the B4 pin; The B5 pin links to each other with micro controller I/O mouth PA5; The B6 pin connects+the 5V power supply; A2 links to each other with analog quantity input interface AN02 with micro controller I/O mouth PB1 respectively with the A8 pin; The B8 pin and+5V power supply ground GND between and connection electrical resistance R4 and polar capacitor CE1, be used for filtering; The B7 pin links to each other with automobile power source anode VPWR; The B12 pin connects+5V power supply ground GND by capacitor C 2; CE2 is a filter capacitor, is connected between automobile power source anode VPWR and the automobile power source negative terminal VPWR-.

7. require described general module as right 1, it is characterized in that: the switch testing circuit is made up of switching value detection chip UP3 and peripheral circuit thereof; UP3 comprises 4 road programmable switch amount detection port and 8 tunnel low-end switch detection port, wherein 4 road programmable switch amount detection port are that high-end switch inserts by software setting, before inserting, high-end switch amount signal, inserts high-end switch amount detection port then by resistance R P1 and diode D1 amplitude limit; Low-end switch amount signal directly inserts low-end switch amount detection port; The switching value detection chip is communicated by letter by the SPI communication interface with microcontroller.

8. require described general module as right 7, it is characterized in that: described switching value detection chip UP3, it is X6 that the programmable switch amount detects pin, it is X7 that the low-end switch amount detects mouth, and the relevant pin of SPI communication is X2, X5, X3 and X4, and the chip grounding pin is X1, chip+5V power pins is X8, chip+24V level pin is X11, and analog quantity multichannel output pin is X10, and the look-at-me output pin is X10;

The annexation of each pin of UP3 is: high-end switch signal SH0 links to each other with the SP0 pin of switching value detection chip UP3 after resistance R P1 step-down; Diode D1 is used for the level of input X6 pin mouth is carried out amplitude limit, the highest automobile power source VPWR that is no more than; Filter capacitor C3 be attempted by the X6 pin and+5V power supply ground GND between; Low-end switch signal SL0 links to each other with the X7 pin, filter capacitor C4 be attempted by the X6 pin and+5V power supply ground GND between; UP3 communicates by letter by the SPI communication interface with microcontroller, and relevant pin is X2, X3, X4 and X5; The X10 pin of UP3 links to each other with the analog quantity input interface AN03 of microcontroller, and by capacitor C 5 ground connection; The X10 pin links to each other with micro controller I/O mouth PA6; Filter capacitor C6 is connected between automobile power source anode VPWR and the automobile power source negative terminal VPWR-.

9. require described general module as right 1, it is characterized in that: described general module is switched on or switched off infomational message by resolving the total power switch that receives from the CAN bus, if total power switch is connected, then enable to connect the power chip output of resistive, the inductive load of working power and normal open power supply; If total power switch disconnects, then enable to connect the power chip output of normal open power source loads.

10. require described general module as right 1, it is characterized in that described general module, its operate as normal power supply is provided+5 volts of stabilized voltage supplys and+5 volts of isolation stabilized voltage supplys by power circuit and reset circuit.

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