CN102889996A - Complete vehicle signal simulation device - Google Patents

Abstract

The invention discloses a whole vehicle signal simulation device, which is used to solve the failure of the after-processing part of the vehicle caused by failure to shield the fault signal of the after-processing part of the vehicle when testing the engine of the vehicle in the prior art The problem that the signal impact test software obtains the fault signal of a component with a higher level of importance. The device includes a plurality of signal simulation components, which are connected with the processor of the engine of the vehicle, and are used for simulating the signals of parts not installed in the vehicle according to the control signal sent by the processor. The device can prevent the test software from reading the fault information of uninstalled parts, thereby preferentially reading the fault information of parts with higher importance levels, and reducing the error rate of fault diagnosis.

Description

A vehicle signal simulation device

technical field

The invention relates to the field of test vehicle communication, in particular to a vehicle signal simulation device.

Background technique

Before the vehicle leaves the factory, the vehicle needs to be tested to check whether the power and torque of the vehicle meet the requirements. Since the parts of the post-processing part of the vehicle are not installed before leaving the factory, during the test, a fault message will appear on the part where the parts are not installed. At present, the method of testing the vehicle mostly uses a junction box, which can ensure the communication between the engine and the seat, but does not shield the fault signals of the after-processing parts of the vehicle. These uninstalled parts do not need to be tested for the pre-factory test of the vehicle. At the same time, test software, such as EOL (End Of Line, engine off-line process) test software, can only read up to 10 fault information , which leads to the fact that the data that needs to be tested may not be readable. For example, the faulty data of the engine, fuel injector, fuel pump metering unit, etc. may not be readable because the faulty data read by the test software has reached the maximum value. Therefore, a method is needed to shield the fault signals of parts that do not need to be detected.

Contents of the invention

The present invention provides a complete vehicle signal simulation device, which is used to solve the problem that the test software cannot be obtained due to failure to shield the fault signal of the post-processing part of the vehicle when the vehicle is tested before leaving the factory in the prior art. Problems with fault signals that need to be tested.

The invention provides a signal simulation device for a whole vehicle, which includes: a plurality of signal simulation components connected with the processor of the vehicle engine and used for simulating signals of parts not installed in the vehicle according to the control signal sent by the processor.

Wherein, the above-mentioned processor is an electronic control unit ECU.

Wherein, the above-mentioned signal simulation components include at least one or a combination of the following: an inductance coil, a resistor, a switch, a power supply, and an indicator light.

Wherein, the above-mentioned signal simulation element is a resistor, and the resistor is respectively connected to two pins of the processor, and is used to simulate the multi-state switch of the car, the indicator light of the water-in-oil sensor and the liquid level sensor of the urea tank.

Among them, the above-mentioned signal simulation components are a plurality of inductance coils, and the two ends of each inductance coil are respectively connected to the two processing pins, which are respectively used to simulate the nozzle of the car, the starting relay, the urea tank heating solenoid valve, the electromagnetic fan, and the urea pressure. sensor and urea return solenoid valve.

Wherein, the above-mentioned signal simulation components are a power supply and an inverter, which are used to provide two voltage signals to simulate the signals when the accelerator pedal of the car is in different gears.

Wherein, the above-mentioned signal simulation components include: a first power supply, a first coil, a second coil and an indicator light; both ends of the indicator light are respectively connected to two pins of the processor; the first power supply is connected to one pin of the processor , one end of the first coil and the second coil are respectively connected to one pin of the processor, and the other end of the first coil and the second coil is connected to one end of the indicator light; when the water in the primary fuel filter storage cup reaches the specified When the water level is reached, the first power supply outputs a control signal to the processor, and the processor controls the indicator light to turn on; when the accumulated water in the water storage cup of the primary fuel filter exceeds the upper limit, the first power supply outputs a control signal to the processor, and the processor controls the indicator light open.

Wherein, the above-mentioned signal simulation components include: a heating relay simulation component, which is used to simulate a heating relay of a car, and the heating relay simulation component includes: a second power supply, a third power supply, a first resistor, and a second resistor; the two ends of the first resistor They are respectively connected to the two pins of the processor, the first end of the second resistor is connected to the first power supply through a switch to form a first branch, and the second end of the second resistor is connected to the second power supply through a switch and then connected to the processor A pin of the device.

Wherein, the above-mentioned signal simulation components are multiple power supplies, which are respectively connected to the pins of the processor, and are used to provide different voltage signals according to the parts of the simulated vehicle.

Wherein, the above-mentioned signal analog components are multiple pulse train output terminals PTO and multiple resistors, the resistors are connected in series, and one end of each resistor is respectively connected to a pulse train output terminal;

The signal input terminal connected with the processor pin is selected to be connected or disconnected with one of the multiple pulse output terminals according to the working condition of the vehicle.

The whole vehicle signal simulation device of the present invention uses the signal simulation element to be connected with the processor to simulate the parts that are not installed in the car, and the processor reads the signal of the signal simulation element to replace the signal of the parts that are not installed in the car, so that it can It prevents the test software from reading the fault information of uninstalled parts, so that the test software can preferentially read the fault information of parts with higher importance, thereby reducing the error rate of fault diagnosis.

Description of drawings

Fig. 1 is the structural representation of the whole vehicle signal simulation equipment of the present invention;

Fig. 2 is the circuit principle diagram of analog car multi-state switch;

Fig. 3 is the circuit principle diagram of the simulation car heating relay group.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

The whole vehicle signal simulation device of the present invention adopts circuit elements such as resistance, inductance coil, power supply and switch to simulate the uninstalled parts of the car, so that when the test software reads the test data of the car, the test results of the uninstalled parts show normal, The test software can preferentially read test data with a higher level of importance.

Fig. 1 is a structural schematic diagram of the whole vehicle signal simulation device of the present invention.

As shown in Figure 1, the vehicle signal simulation device interacts with the processor of the vehicle's engine to simulate the parts that are not installed in the vehicle.

The processor is connected to the engine of the vehicle, and can output control signals to each signal simulation component according to the current working condition of the vehicle, and then read the signal of the signal simulation component, and send the read signal to the external testing equipment. Specifically, the processor can control the connection or disconnection of each signal simulation component by sending a control signal to each pin according to the current working condition of the vehicle, and the processor sends the read signal of the signal simulation component to the test software .

Among them, the processor can use a special automotive microcomputer controller ECU (Electronic Control Unit, electronic control unit). The processor can calculate, process and judge the information input by the air flow meter and various sensors according to the program and data in the memory, and then output instructions to provide an electric pulse signal of a certain width to the fuel injector to control the fuel injection volume.

Wherein, the whole vehicle signal simulation device of the present invention is made up of a plurality of signal simulation elements connected to the processor of the vehicle engine, as shown in Figure 1, signal simulation element 1 to signal simulation element N are connected with the above-mentioned processor, and It is used to simulate the after-treatment parts not installed in the vehicle, and simulate the signal of the uninstalled parts according to the control signal. Wherein, a single signal simulation component can be used to simulate a single part, or multiple signal simulation components can be connected to simulate a single part. Wherein, the signal simulation component may include at least one or a combination of the following: an inductance coil, a resistor, a switch, a power supply, and an indicator light. That is to say, when simulating an uninstalled part of the car, a resistor with a specified resistance value can be used to simulate a part with the same resistance value. For example, the resistance value of the urea sensor of the test car is 5.1 ohms, so it can be directly A 5.1 ohm resistor is directly connected to the two pins of the processor to replace the car's urea sensor. In this way, when the test software EOL reads the test data of the car through the vehicle signal simulation device, it can read If the signal of the urea sensor is normal, otherwise, since the vehicle is not equipped with a urea sensor, the signal of the urea sensor read by the EOL is disconnected, and it will be treated as a fault signal.

Fig. 2 is the circuit schematic diagram of the multi-state switch of the simulated car.

The multi-state switch of the car can switch the gear position of the multi-state switch according to the load of the whole car, so that the whole car can run at different powers, which can save fuel. As shown in Figure 2, four pulse output terminals and four series resistors are used to simulate the multi-state switch of the car, wherein the resistors are connected in series, and one end of each resistor is respectively connected to a pulse train output terminal; the signal connected to the processor pin The input terminal is selected to be connected or disconnected with one of the multiple pulse output terminals according to the working condition of the vehicle. When the signal input terminal is connected to the pulse train output (PulseTrain Output) PTO1, PTO2, PTO3 and PTO4, different resistance values can be connected. It should be noted that any parts not installed in the car that can be simulated by resistors can be simulated in this way.

At the same time, according to the characteristics that the inductance coil can prevent the participation of alternating current from passing, and only allow the passage of direct current, and also has the effect of filtering, the inductance coil can be used to simulate some uninstalled parts, such as the nozzle of the car, the starting relay, and the heating electromagnetic of the urea tank. The valve, electromagnetic fan, urea pressure sensor, and urea return solenoid valve can actually be simulated by connecting an inductance coil to both ends of the processor.

The power supply and the inverter can be connected to the pins of the processor. The power supply provides two voltage signals through the inverter, and at the same time, the signal of the accelerator pedal of the car is simulated when it is in different gears by changing the voltage signal.

The water-in-oil sensor not installed in the car can be simulated by the following components, the first power supply, the first coil, the second coil and the indicator light; where the two ends of the indicator light are connected to the two pins of the processor; The first power supply is connected to a pin of the processor, one end of the first coil and the second coil are respectively connected to one pin of the processor, and the other ends of the first coil and the second coil are connected to one end of the indicator light; When the water in the water collection cup of the air filter reaches the specified water level, the first power supply outputs a signal to the processor, and the processor controls the indicator light to turn on to remind the driver to drain the water. When the accumulated water in the water storage cup of the primary fuel filter exceeds the upper limit, the The first power supply outputs a control signal to the processor, and the processor controls the indicator light to turn on to remind the driver to remove the accumulated water as soon as possible.

Fig. 3 is the circuit principle diagram of the simulation car heating relay group.

The aftertreatment heating relay of the vehicle is used for engine emission treatment, as shown in Figure 3, the following signal simulation components can be used to simulate the heating relay: the second power supply, the third power supply, the first resistor, and the second resistor; the first The two ends of the resistor are respectively connected to the two pins of the processor, the first end of the second resistor is connected to the first power supply through a switch to form a first branch, and the second end of the second resistor is connected to the second power supply through a switch Then connect to a pin of the processor. Since the vehicle needs to be equipped with a heating relay group, multiple simulated heating relay groups with the above structure can be connected to the processor. The heaters of each part of the car’s post-processing are managed by the control logic of the processor. After the processor receives the external heating command of the post-processing system, according to the logic set by the software, the corresponding pins of the analog heating relay are respectively controlled. The signal simulation component sends a control command, turns on the heating device, and sends the feedback signal back to the processor. As shown in the figure, 5V in the simulation device is the feedback signal.

In the present invention, a plurality of power supplies can also be used to connect to the pins of the processor according to the characteristics of the parts of the car to be simulated, and different voltage signals can be provided for the processor according to the parts of the car to be simulated.

The vehicle signal simulation device of the present invention is connected to the processor by adopting components such as resistors, inductance coils, power supplies, and switches, and the processor reads the signals of each component to replace the signals of parts not installed in the vehicle, thereby avoiding testing The software reads the fault information of uninstalled parts, and can preferentially read the fault information of parts with higher importance, thereby reducing the error rate of fault diagnosis.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims (10)

1. A vehicle signal simulation device, characterized in that, comprising: A plurality of signal simulation components are connected with the processor of the engine of the vehicle and used for simulating signals of parts not installed in the vehicle according to the control signals sent by the processor. 2. The apparatus of claim 1, wherein the processor is an electronic control unit (ECU). 3. The device according to claim 1, wherein the signal simulation element comprises at least one or more of the following combinations: Inductor coils, resistors, switches, power supplies, and indicator lights. 4. The device according to claim 1, wherein the signal simulation element is a resistor, and the resistors are respectively connected to two pins of the processor for simulating a multi-state switch of a car, a water-in-oil Sensor indicator light and urea tank liquid level sensor. 5. The device according to claim 1, wherein the signal simulation element is a plurality of inductance coils, and the two ends of each inductance coil are respectively connected to the two pins of the processing, and are respectively used to simulate the Nozzle, starting relay, urea tank heating solenoid valve, electromagnetic fan, urea pressure sensor and urea return solenoid valve. 6 . The device according to claim 1 , wherein the signal simulation components are a power supply and an inverter, which are used to provide two voltage signals to simulate the signals when the accelerator pedal of the car is in different gears. 7. The device according to claim 1, wherein the signal simulation element comprises: a first power supply, a first coil, a second coil and an indicator light; Both ends of the indicator light are respectively connected to two pins of the processor; The first power supply is connected to a pin of the processor, one end of the first coil and the second coil are respectively connected to a pin of the processor, and the other ends of the first coil and the second coil After one end is connected, it is connected to one end of the indicator light; When the water in the water storage cup of the primary fuel filter reaches a specified water level, the first power supply outputs a control signal to the processor, and the processor controls the indicator light to turn on; When the accumulated water in the water storage cup of the primary fuel filter exceeds the upper limit, the first power supply outputs a control signal to the processor, and the processor controls the indicator light to turn on. 8. The device according to claim 1, wherein the signal simulation element comprises: The heating relay simulation element is used to simulate the heating relay of the car, and the heating relay simulation element includes: a second power supply, a third power supply, a first resistor, and a second resistor; Both ends of the first resistor are respectively connected to two pins of the processor, the first end of the second resistor is connected to the first power supply through a switch to form a first branch, and the second resistor The second end is connected to a second power supply through a switch and then connected to a pin of the processor. 9. The device according to claim 1, wherein the signal simulation element is a plurality of power supplies, which are respectively connected to the pins of the processor, and are used to provide different voltage signals according to the parts of the car to be simulated . 10. The device according to claim 1, wherein the signal analog element is a plurality of pulse train output terminals PTO and a plurality of resistors, The resistors are connected in series, and one end of each resistor is respectively connected to a pulse train output end; The signal input terminal connected to the processor pin is selected to be connected or disconnected with one of the plurality of pulse output terminals according to the working condition of the vehicle.

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