CN207881949U - A vehicle after-processing sensor simulation device - Google Patents

Abstract

A simulation device for a finished automobile aftertreatment sensor is used for simulating a circuit formed by a single resistor of a resistor type sensor and a circuit formed by two resistors connected in series and used for simulating a voltage type sensor, and is arranged on a circuit board, and pins of each circuit are connected with a hot test wire harness end plug or a rack end wire harness plug through a wire harness. The utility model discloses to different sensor types, the design corresponds analog circuit, makes each sensor analog state in reasonable within range, avoids appearing influencing the trouble of engine performance in the engine test process, guarantees the normal hot examination of engine.

Description

A vehicle after-processing sensor simulation device

technical field

The utility model relates to the technical field of engine manufacturing, in particular to the technical field of engine hot test.

Background technique

When the engine was tested on the hot test bench, since there was no post-processing device for the whole vehicle, various post-processing-related sensor failures occurred in the ECU, resulting in limited engine power, and it was impossible to verify whether the engine performance was up to standard. In order to solve the problem of engine ECU reporting faults, there are the following two solutions:

Solution 1. Adjust the ECU electronic control data for a version of the test. After shielding the whole vehicle in the data, deal with all related faults to meet the normal test of the engine on the hot test bench. After the test is completed, the normal ECU electronic control data needs to be written to the engine In the ECU.

Plan 2: install the post-processing device of the whole vehicle on the hot test bench, fill the urea tank with urea solution, and add a urea recovery device at the urea nozzle.

Disadvantages of option one:

1) Increase the workload of R&D personnel and technical personnel to modify, maintain and manage ECU electronic control data;

2) Increase the workload of workers writing ECU electronic control data;

3) After the hot test is completed, the correctness of the ECU electronic control data flashed cannot be verified;

4) After the hot test is completed, it is necessary to rewrite the ECU electronic control data. After the rewriting, there is no re-verification link, and there is a risk of missing the rewriting.

Disadvantages of option two:

1) After adding a post-processing device on the hot test bench, the complexity of the bench will be increased, which is not conducive to the maintenance and repair of the hot test bench;

2) The post-processing device contains wearing parts, and the maintenance cost is high;

3) The urea solution is a consumable product, which needs to be added regularly, and the cost is high;

4) The urea solution needs to be recycled and added regularly, increasing the workload of workers.

Utility model content

In order to avoid failures affecting engine performance during the engine test and to ensure normal engine hot test, the utility model provides a sensor simulation device for after-treatment of the whole vehicle.

The technical scheme adopted by the utility model to achieve the above object is: a sensor simulation device for after-treatment of the whole vehicle, a resistance sensor simulation circuit circuit composed of a single resistor for simulating a resistance sensor and a circuit circuit for simulating a voltage sensor A voltage-type sensor analog circuit composed of two resistors in series is installed on the circuit board, and the pins of each circuit are connected to the hot test harness end plug 2 or the bench end harness plug 1 through a wire harness.

The resistance sensor simulation circuit includes: urea nozzle metering valve simulation circuit 3, exhaust valve simulation circuit 5, SCR inlet temperature sensor simulation circuit 6, SCR atmospheric temperature sensor simulation circuit 7, urea tank heating valve simulation circuit 8, urea pipe Heating relay simulation circuit 9 , urea pump heating relay simulation circuit 10 , urea liquid level simulation circuit 11 and urea temperature simulation circuit 12 .

The voltage sensor simulation circuit includes a urea pressure sensor simulation circuit 4 .

The hot test wire harness end plug 2, the bench end wire harness plug 1 and the circuit board are installed in the control box.

The vehicle post-processing sensor simulation device of the utility model is designed with corresponding simulation circuits for different sensor types, so that the simulation state of each sensor is within a reasonable range, avoiding failures that affect engine performance during the engine test process, and ensuring the normal hot test of the engine. The post-processing sensor simulation circuit is installed inside the harness control box of the bench, which ensures the reliability of the device; no additional operation by workers is required to ensure the work cycle; the post-processing sensor simulation device does not contain wearing parts and does not require daily maintenance, which reduces maintenance costs ; Directly use the vehicle ECU electronic control data test, that is, the accuracy of the tested ECU electronic control data also avoids the quality risk caused by rewriting the ECU electronic control data.

Description of drawings

Fig. 1 is a structural diagram of a wiring harness plug at the bench end of the vehicle post-processing sensor simulation device of the utility model.

Fig. 2 is a structural diagram of a hot test wire harness end plug of the vehicle after-treatment sensor simulation device of the present invention.

Fig. 3 is a simulation circuit diagram of the vehicle after-processing sensor of the present invention.

Figure 4 is a schematic diagram of the simulation of a resistive sensor.

Figure 5 is a schematic diagram of the voltage sensor simulation.

In the figure: 1. Wire harness plug at bench end, 2. Hot test wire harness end plug, 3. Urea nozzle metering valve simulation circuit, 4. Urea pressure sensor simulation circuit, 5. Exhaust valve simulation circuit, 6. SCR inlet temperature sensor Analog circuit, 7. SCR atmospheric temperature sensor analog circuit, 8. Urea tank heating valve analog circuit, 9. Urea pipe heating relay analog circuit, 10. Urea pump heating relay analog circuit, 11. Urea liquid level analog circuit, 12. Urea Temperature simulation circuit, 13. ECU diagnostic instrument, 14. Resistance box, 15. ECU power supply/control system, 16. Engine ECU.

Detailed ways

The vehicle post-processing sensor simulation device of the utility model can be simulated by using resistances with corresponding resistance values for temperature sensors and liquid level sensors; for electromagnetic relays and electromagnetic valves, can be simulated with resistances with corresponding resistance values; for pressure sensors , can be simulated with corresponding voltage values. Install the harness end plug 1 of the bench, the hot test harness end plug 2, and the sensor simulation circuit in the control box, and connect the electronic components together through the wire harness to realize the simulation of the vehicle after-treatment device. The harness end plug of the bench 1 As shown in Figure 1, it is used to supply power to the device, the plug model: Y2M-36ZJBM. The plug 2 at the end of the hot test harness is shown in Figure 2 and is used to connect the hot test harness. The plug model is Y2M-50ZKBM. The analog circuit of the sensor and the connecting terminal with the plug are shown in Figure 3, which includes a resistive analog circuit: urea nozzle metering valve analog circuit 3, exhaust valve analog circuit 5, SCR inlet temperature sensor analog circuit 6, SCR atmospheric temperature sensor analog circuit Circuit 7, urea tank heating valve simulation circuit 8, urea pipe heating relay simulation circuit 9, urea pump heating relay simulation circuit 10, urea liquid level simulation circuit 11 and urea temperature simulation circuit 12. The voltage sensor simulation circuit includes a urea pressure sensor simulation circuit 4 . The vehicle after-processing sensor simulation device is small in size, easy to install, low in cost, reliable in operation, and requires no routine maintenance or additional operation. For different sensor types, the corresponding analog circuits are designed so that the simulated state of each sensor is within a reasonable range, avoiding failures that affect engine performance during the engine test, and ensuring the normal hot test of the engine.

The resistance value in the analog circuit is determined by:

By querying the schematic diagram and technical requirements of the external circuit of the engine ECU, the simulation mode of each sensor is determined, and the specific range of the parameters is determined at the same time.

For the resistance type sensor, connect the resistance box to the corresponding pin of the ECU through the wire harness, as shown in Figure 4, adjust the resistance value of the resistance box 14, and read the display value of the ECU 16 with the diagnostic instrument 13 until the data displayed by the ECU is within a reasonable range. Intermediate value, record the resistance box resistance value at this time.

For the voltage sensor, connect the two resistance boxes in series and connect them to the corresponding pins of the ECU through the wiring harness, as shown in Figure 5, adjust the resistance values of the two resistance boxes 14 respectively, and use the diagnostic instrument 13 to read the displayed value of the ECU 16 at the same time until The ECU shows that the data is in the middle of a reasonable range, and records the resistance values of the two resistance boxes at this time.

After all parameters are determined, fix the circuit board with soldered resistors in the control box, and connect the pins to the corresponding pins of the hot test harness end plug. A fuse is added to the main power supply in the harness box to protect the inside of the harness box. Electrical devices are not burned.

Claims (4)

1. a kind of vehicle aftertreatment sensors simulator, it is characterised in that：Resistance type sensor analog circuit and voltage-type pass Sensor analog circuit is installed on circuit board, and resistance type sensor analog circuit is made of a resistance, and resistance both ends pass through electricity Harness connects two pins；Voltage sensor analog circuit is made of two resistance, and two resistance both ends and centre pass through electricity Harness connects three pins, and the pin of each circuit connects heat examination harness end plug by wirning harness（2）Or rack end harness connector plug （1）.

2. a kind of vehicle aftertreatment sensors simulator according to claim 1, it is characterised in that：The resistor-type passes Sensor analog circuit includes：Urea nozzle metering valve analog circuit（3）, air bleeding valve analog circuit（5）, SCR inlet temperature sensing Device analog circuit（6）, SCR atmosphere temperature transducer analog circuits（7）, urea box heating valve analog circuit（8）, urea tube heating Relay analog circuit（9）, urea pump heat relay analog circuit（10）, urea level analog circuit（11）And urea temperature Analog circuit（12）.

3. a kind of vehicle aftertreatment sensors simulator according to claim 1, it is characterised in that：The voltage-type passes Sensor analog circuit includes urea pressure sensor analog circuit（4）.

4. a kind of vehicle aftertreatment sensors simulator according to claim 1, it is characterised in that：The heat examination harness Hold plug（2）, rack end harness connector plug（1）It is installed in control box with circuit board.