CN214751467U - Retarder electric control unit function test system - Google Patents
Retarder electric control unit function test system Download PDFInfo
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- CN214751467U CN214751467U CN202121420912.6U CN202121420912U CN214751467U CN 214751467 U CN214751467 U CN 214751467U CN 202121420912 U CN202121420912 U CN 202121420912U CN 214751467 U CN214751467 U CN 214751467U
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Abstract
The utility model discloses an automatically controlled unit functional test system of retarber. The system comprises a test control circuit, a functional signal output circuit, an execution output circuit and a test indication circuit; the functional signal control end of the test control circuit is electrically connected with the control end of the functional signal output circuit; the test control circuit controls the functional signal output circuit to output different functional signals; the functional signal output end of the functional signal output circuit is electrically connected with the functional signal receiving end of the retarder electronic control unit; the control signal output end of the retarder electric control unit is electrically connected with the control end of the execution output circuit; the retarder electric control unit controls the execution output circuit to output different voltage signals according to the function signal; and a voltage signal receiving end of the test control circuit is electrically connected with a voltage signal output end of the execution output circuit, and the test control circuit controls the test indicating circuit to generate a test result of the functional diagnosis of the retarder electric control unit according to the voltage signal output by the execution output circuit.
Description
Technical Field
The embodiment of the utility model provides an embodiment relates to the automatically controlled unit functional diagnosis technique of retarber, especially relates to an automatically controlled unit functional test system of retarber.
Background
The hydrodynamic retarder is an auxiliary braking device, and the hydrodynamic retarder generates braking torque based on the fluid dynamics principle. The hydrodynamic retarder comprises two impellers, a rotor is arranged on an input shaft of the retarder, and a stator is fixed on a shell of the retarder. When the retarder is started, liquid is squeezed into a working cavity between the rotating wheel and the fixed wheel, and the liquid sealed in the working cavity is accelerated by the rotating motion of the rotating wheel. The liquid is pushed to the outer diameter to enter the fixed wheel, the inner ring in the working cavity returns to the rotating wheel after the liquid changes the direction in the stator, and the energy consumed (absorbed) by the accelerated liquid comes from the kinetic energy of the vehicle running, so that the liquid has a strong retarding effect. The liquid energy generated in the buffering process is converted into heat, and in order to dissipate the heat energy, part of the oil in the working cycle is continuously pumped from the wheel through the heat exchanger and is directly led into the working cycle again through the oil filling channel. In the heat exchanger, the heat of the oil is transferred to the cooling water and dissipated through the vehicle cooling device.
The hydraulic retarder system mainly comprises a retarder body and a retarder electric control unit. The retarder body comprises a fixed wheel and a pump wheel, and a cavity between the fixed wheel and the pump wheel is filled with working medium (hydraulic oil). The electric control unit of the retarder mainly works to receive message signals of vehicle speed, engine rotating speed, various sensors and the like and realize target braking torque by controlling the capacity of hydraulic oil in the retarder. The sensors comprise a water temperature sensor, an oil temperature sensor and an air pressure sensor; wherein the actuator comprises a proportional solenoid valve.
In the working process of the hydraulic retarder system, the retarder electric control unit can control the opening of the proportional electromagnetic valve according to signals output by the water temperature sensor, the oil temperature sensor and the air pressure sensor. In the prior art, in order to detect whether the retarder electronic control unit can accurately control the opening of the proportional solenoid valve, a field tester can manually judge the opening of the proportional solenoid valve, so that the problems that manual testing is long in time consumption, low in precision, poor in consistency, incapable of realizing automatic testing and the like are caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides an automatically controlled unit functional test system of retarber has realized the full automatization functional test to the automatically controlled unit of retarber.
The embodiment of the utility model provides a retarder electronic control unit function test system, this system includes test control circuit, functional signal output circuit, carries out output circuit and test indicating circuit;
the functional signal control end of the test control circuit is electrically connected with the control end of the functional signal output circuit; the test control circuit is used for controlling the functional signal output circuit to output different functional signals;
the functional signal output end of the functional signal output circuit is electrically connected with the functional signal receiving end of the retarder electronic control unit;
the control signal output end of the retarder electric control unit is electrically connected with the control end of the execution output circuit; the retarder electric control unit is used for controlling the execution output circuit to output different voltage signals according to the function signal;
the voltage signal receiving end of the test control circuit is electrically connected with the voltage signal output end of the execution output circuit, and the indication signal output end of the test control circuit is electrically connected with the indication control end of the test indication circuit; the test control circuit is used for controlling the test indication circuit to generate a test result of the functional diagnosis of the retarder electric control unit according to the voltage signal output by the execution output circuit.
Optionally, the functional signal output circuit comprises a water temperature sensor simulation circuit;
the function signal control end comprises a water temperature signal control end; the functional signal receiving end comprises a water temperature signal input end;
the water temperature sensor simulation circuit is electrically connected between the water temperature signal control end and the water temperature signal output end.
Optionally, the water temperature sensor simulation circuit includes a plurality of water temperature sensor driving circuits, a plurality of water temperature sensor switch circuits, and a plurality of first resistors;
the water temperature signal control end comprises a plurality of water temperature driving ends; the water temperature signal input end comprises a first water temperature signal input end and a second water temperature signal input end;
the driving ends of the water temperature sensor driving circuits are electrically connected with the water temperature driving ends in a one-to-one correspondence manner; the output end of the driving circuit of each water temperature sensor is electrically connected with the control end of the switch circuit of each water temperature sensor in a one-to-one correspondence manner; the first resistors are electrically connected between the input end and the output end of the water temperature sensor switch circuit in a one-to-one correspondence manner, and are sequentially connected between the first water temperature signal input end and the second water temperature signal input end in series;
and the water temperature sensor driving circuits are used for driving the water temperature sensor switching circuits to be switched on or switched off in a one-to-one correspondence manner under the control of the test control circuit.
Optionally, the functional signal output circuit includes an oil temperature sensor simulation circuit;
the function signal control end comprises an oil temperature signal control end; the functional signal receiving end comprises an oil temperature signal input end;
the oil temperature sensor simulation circuit is electrically connected between the oil temperature signal control end and the oil temperature signal input end.
Optionally, the oil temperature sensing simulation circuit includes a plurality of oil temperature sensor driving circuits, a plurality of oil temperature sensor switching circuits, and a plurality of second resistors;
the oil temperature signal control end comprises a plurality of oil temperature driving ends; the oil temperature signal input end comprises a first oil temperature signal input end and a second oil temperature signal input end;
the driving end of each oil temperature sensor driving circuit is electrically connected with each oil temperature driving end in a one-to-one correspondence manner; the output end of the driving circuit of each oil temperature sensor is electrically connected with the control end of the switching circuit of each oil temperature sensor in a one-to-one correspondence manner; the second resistors are electrically connected between the input end and the output end of the oil temperature sensor switching circuit in a one-to-one correspondence manner, and are sequentially connected between the first oil temperature signal input end and the second oil temperature signal input end in series;
and the oil temperature sensor driving circuits are used for driving the oil temperature sensor switching circuits to be switched on or switched off in a one-to-one correspondence manner under the control of the test control circuit.
Optionally, the functional signal output circuit further includes an air pressure sensor simulation circuit;
the function signal control end also comprises an air pressure signal control end, and the function signal receiving end also comprises an air pressure signal receiving end;
the air pressure sensor simulation circuit is electrically connected between the air pressure signal control end and the air pressure signal receiving end;
the test control circuit also comprises a vehicle speed signal output end and an accelerator pedal signal output end; the retarder electric control unit also comprises a vehicle speed signal receiving end and an accelerator pedal signal receiving end; the vehicle speed signal receiving end is electrically connected with the vehicle speed signal output end, and the accelerator pedal signal receiving end is electrically connected with the accelerator pedal signal output end;
the retarder electronic control unit is also used for controlling the execution output circuit to output a voltage signal according to the simulation vehicle speed signal and the simulation accelerator pedal release signal output by the test control circuit;
the test control circuit is also used for controlling the air pressure sensor simulation circuit to output an air pressure sensing signal according to the voltage signal output by the execution output circuit;
the retarder electric control unit is also used for controlling the execution output circuit to output a voltage signal according to the air pressure sensing signal.
Optionally, the air pressure sensor includes a filter and an operational amplifier;
the filter is electrically connected between the air pressure signal control end and the positive phase input end of the operational amplifier; the negative phase input end of the operational amplifier is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is also electrically connected with the air pressure signal receiving end.
Optionally, the method further includes: a voltage acquisition circuit; the voltage acquisition circuit is electrically connected between the voltage signal output end and the voltage signal receiving end.
Optionally, the test control circuit includes a single chip microcomputer and a keyboard;
the keyboard is used for generating a function instruction according to an operation instruction of a user;
the single chip microcomputer is electrically connected with the instruction output end of the keyboard, the function signal control end, the voltage signal receiving end and the indication signal output end respectively; the single chip microcomputer is used for controlling the functional signal output circuit to output different functional signals according to the functional instruction, and controlling the test indicating circuit to generate a test result of the functional diagnosis of the retarder electric control unit according to the voltage signal output by the execution output circuit.
Optionally, the test indication circuit comprises a plurality of indicator lights and a display;
the test control circuit is used for controlling the indicator lamps to emit light and controlling the display to display according to the different voltage signals.
The embodiment of the utility model provides a, through the different function signal of test control circuit control function signal output circuit output, make the automatically controlled unit of retarber carry out the different voltage signal of output circuit output according to function signal control, and adopt test control circuit according to the voltage signal who carries out output circuit output, control test indicating circuit generates the functional diagnosis's of the automatically controlled unit of retarber test result, realized the automatically controlled unit full automatization functional test of retarber, the opening that the tester of scene can manually judge among the prior art carries out output circuit has been solved, it is long to cause manual test to consume like this, the precision is low, the uniformity is poor, can't realize the automation test scheduling problem.
Drawings
Fig. 1 is a schematic structural diagram of a functional test system for an electric control unit of a retarder according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a function test system for an electric control unit of another retarder according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a simulation circuit of an air pressure sensor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a water temperature sensor simulation circuit provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an oil temperature sensor simulation circuit provided in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a voltage acquisition circuit provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a functional test system for an electric control unit of a retarder according to an embodiment of the present invention, as shown in fig. 1, the test system includes a test control circuit 10, a functional signal output circuit 20, an execution output circuit 30, and a test indication circuit 40; the control end of the functional signal of the test control circuit 10 is electrically connected with the control end of the functional signal output circuit 20; the test control circuit 10 is used for controlling the functional signal output circuit 20 to output different functional signals; the functional signal output end of the functional signal output circuit 20 is electrically connected with the functional signal receiving end of the retarder electronic control unit 001; the control signal output end of the retarder electronic control unit 001 is electrically connected with the control end of the execution output circuit 30; the retarder electronic control unit 001 is used for controlling the execution output circuit 30 to output different voltage signals according to the function signals; a voltage signal receiving end of the test control circuit 10 is electrically connected with a voltage signal output end of the execution output circuit 30, and an indication signal output end of the test control circuit 10 is electrically connected with an indication control end of the test indication circuit 40; the test control circuit 10 is configured to control the test instruction circuit 40 to generate a test result of the functional diagnosis of the retarder electronic control unit 001 according to the voltage signal output by the execution output circuit 30.
The hydraulic retarder system mainly comprises a retarder body and a retarder electric control unit. The retarder body comprises a fixed wheel and a pump wheel, and a cavity between the fixed wheel and the pump wheel is filled with working medium (hydraulic oil). The electric control unit of the retarder mainly works to realize target braking torque by controlling the opening of the proportional electromagnetic valve so as to control the capacity of hydraulic oil in the retarder according to received message signals of vehicle speed, engine rotating speed, various sensors and the like, so that the braking torque is superposed on an output shaft of a gearbox, and the aim of reducing the speed of a vehicle is fulfilled. In order to detect whether the retarder electronic control unit can accurately control the opening of the proportional solenoid valve, the technical scheme controls the functional signal output circuit 20 to output different functional signals through the test control circuit 10, and the functional signal output circuit 20 comprises a water temperature sensor simulation circuit, an oil temperature sensor simulation circuit and an air pressure sensor simulation circuit in an exemplary manner; the retarder electronic control unit 001 controls the execution output circuit 30 to output different voltage signals according to the function signal; illustratively, the execution output circuit 30 includes a proportional solenoid valve 31 and a sampling resistor 32, and the control signal output end of the retarder electronic control unit 001 includes a proportional solenoid valve high-level control signal output end and a proportional solenoid valve low-level control signal output end; the high-level control signal output end of the proportional solenoid valve is electrically connected with the control end of the proportional solenoid valve; the output end of the proportional solenoid valve 31 is electrically connected with the first end of the sampling resistor 32, the second end of the sampling resistor 32 is electrically connected with the low-level control signal output end of the proportional solenoid valve, and the first end of the sampling resistor 32 is simultaneously used as a voltage signal output end and is electrically connected with a voltage signal receiving end of the test control circuit 10; the retarder electronic control unit 001 controls the opening degree of the proportional solenoid valve 31 according to the function signal, so that the sampling resistor 32 correspondingly outputs different voltage signals; the test control circuit 10 compares the received voltage signal with the expected voltage signal according to the voltage signal output by the sampling resistor 32, and if the output voltage signal is matched with the expected voltage signal, the retarder electronic control unit 001 has a function of controlling the proportional solenoid valve 31 to execute, and controls the test indication circuit 40 to generate a correct test result. If the output voltage signal does not match the expected voltage signal, the retarder electronic control unit 001 does not have the function of controlling the proportional solenoid valve 31 to execute, and the test indication circuit 40 is controlled to generate an error test result. Therefore, the full-automatic test of the function diagnosis of the retarder electronic control unit 001 is realized through the test control circuit, and the problems that in the prior art, the manual test is long in time consumption, low in precision, poor in consistency, incapable of realizing the automatic test and the like because the opening degree of the proportional electromagnetic valve is directly judged manually by field testers are solved.
Optionally, fig. 2 is a schematic structural diagram of a function testing system of an electronic control unit of a retarder according to an embodiment of the present invention, as shown in fig. 2, a function signal output circuit 20 includes an air pressure sensor simulation circuit 21; the function signal control end comprises an air pressure signal control end, and the function signal receiving end comprises an air pressure signal receiving end; the air pressure sensor simulation circuit 21 is electrically connected between the air pressure signal control end and the air pressure signal receiving end;
the test control circuit 10 further comprises a vehicle speed signal output end and an accelerator pedal signal output end; the retarder electronic control unit 001 further comprises a vehicle speed signal receiving end and an accelerator pedal signal receiving end; the vehicle speed signal receiving end is electrically connected with the vehicle speed signal output end, and the accelerator pedal signal receiving end is electrically connected with the accelerator pedal signal output end; the retarder electronic control unit 001 is further configured to control the sampling resistor 32 in the execution output circuit 30 to output a voltage signal according to the simulated vehicle speed signal and the simulated accelerator pedal release signal output by the test control circuit 10; the test control circuit 10 is used for controlling the air pressure sensor simulation circuit 21 to output an air pressure signal according to the voltage signal output by the sampling resistor 32 in the execution output circuit 30; the retarder electronic control unit 001 is configured to control the sampling resistor 32 in the execution output circuit 30 to output a voltage signal according to the air pressure signal.
When the retarder system is started, when the retarder electronic control unit 001 receives a simulated vehicle speed signal output by the test control circuit 10 and is greater than a preset vehicle speed and receives a simulated accelerator pedal release signal, the retarder electronic control unit 001 is automatically activated, the retarder electronic control unit 001 controls the proportional electromagnetic valve 31 to be opened at the moment, and the sampling resistor 32 correspondingly outputs a certain voltage signal; the test control circuit 10 can collect the voltage signal output by the sampling resistor 32 through the internal ADC function, and output the air pressure signal to the air pressure sensor simulation circuit 21 according to the proportional relationship between the voltage signal and the air pressure signal; the retarder electronic control unit 001 corrects the opening of the proportional electromagnetic valve 31 in real time according to the received air pressure signal, and the sampling resistor 32 outputs a corrected voltage signal in real time; the test control circuit 10 compares the received correction voltage signal with the expected correction voltage signal, if the received correction voltage signal is matched with the expected correction voltage signal, the retarder electronic control unit 001 has the function of controlling the proportional solenoid valve 31 to execute, and the test indication circuit 40 is controlled to generate a correct test result; if the received correction voltage signal does not match the expected correction voltage signal, the retarder electronic control unit 001 does not have the function of controlling the proportional solenoid valve 31 to execute, and the test instruction circuit 40 is controlled to generate an erroneous test result.
Optionally, fig. 3 is a schematic structural diagram of an air pressure sensor simulation circuit provided in an embodiment of the present invention, and as shown in fig. 3, the air pressure sensor simulation circuit 21 includes a filter 211 and an operational amplifier 212; the filter 211 is electrically connected between the air pressure signal control end and the positive phase input end of the operational amplifier 212; the inverting input terminal of the operational amplifier 212 is electrically connected to the output terminal thereof, and the output terminal of the operational amplifier 212 is further electrically connected to the air pressure signal receiving terminal of the retarder electronic control unit 001. Specifically, the filter 211 includes a first resistor R1 and a first capacitor C1; the first end of the first resistor R1 is electrically connected to the air pressure signal control end of the test control circuit 10, the second end of the first resistor R1 is electrically connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded.
The test control circuit 10 outputs an air pressure signal with a variable duty ratio through the PWM unit, the first resistor R1 and the first capacitor C1 form a filter 211, the air pressure signal is filtered, and then the air pressure signal is amplified through the operational amplifier 212, and a simulated air pressure signal is output at the output end of the operational amplifier 212, so as to simulate the working air pressure value of the air pressure sensor simulation circuit 21, so that the retarder electronic control unit 001 controls the proportional solenoid valve 31 to open a certain opening degree according to the air pressure signal.
Optionally, with continued reference to fig. 2, the functional signal output circuit 20 further includes a water temperature sensor emulation circuit 22; the function signal control end comprises a water temperature signal control end; the functional signal receiving end comprises a water temperature signal input end; the water temperature sensor simulation circuit 22 is electrically connected between the water temperature signal control end and the water temperature signal output end.
In the working process of the practical retarder system, liquid is squeezed into a working cavity between the rotating wheel and the fixed wheel, the rotating motion of the rotating wheel accelerates the liquid sealed in the working cavity, so that the liquid is pushed to the outer diameter to enter the fixed wheel, the moving direction of the liquid in the fixed wheel is changed and then returns to the rotating wheel from an inner ring in the working cavity, the energy of the liquid generated in the middle is converted into heat energy, the liquid is continuously pumped into the heat exchanger from the rotating wheel, and in the heat exchanger, the heat of the liquid oil is exchanged into cooling water and is dissipated out through the automobile cooling device. In the technical scheme, the test control circuit 10 controls the water temperature sensor simulation circuit 22 to output an excess water temperature signal; the retarder electronic control unit 001 receives the water temperature exceeding signal, controls the proportional electromagnetic valve 31 in the execution output circuit 30 to be completely closed, the sampling resistor 32 outputs a voltage signal correspondingly, and the whole retarder system quits the function of retarding to play a role of protecting the retarder system; at this time, the test control circuit 10 receives the voltage signal output by the sampling resistor 32, and compares the voltage signal with the expected voltage signal, if the received output voltage signal matches the expected voltage signal, the retarder electronic control unit 001 controls the test instruction circuit 40 to output a correct test result, otherwise, an incorrect test result is output.
Optionally, fig. 4 is a schematic structural diagram of a water temperature sensor simulation circuit provided in an embodiment of the present invention, and as shown in fig. 4, the water temperature sensor simulation circuit 22 includes a plurality of water temperature sensor driving circuits 221, a plurality of water temperature sensor switching circuits 222, and a plurality of first resistors R; the water temperature signal control end comprises a plurality of water temperature driving ends; the water temperature signal input end comprises a first water temperature signal input end and a second water temperature signal input end; the driving ends of the water temperature sensor driving circuits are electrically connected with the water temperature driving ends in a one-to-one correspondence manner; the output end of the driving circuit 221 of each water temperature sensor is electrically connected with the control end of each water temperature sensor switch circuit 222 in a one-to-one correspondence manner; each first resistor R is electrically connected between the input end and the output end of the water temperature sensor switch circuit 222 in a one-to-one correspondence manner, and each first resistor R is sequentially connected between the first water temperature signal input end and the second water temperature signal input end in series; the water temperature sensor driving circuits 221 are used to drive the water temperature sensor switching circuits 222 to be turned on or off in a one-to-one correspondence manner under the control of the test control circuit 10.
When the test control circuit 10 controls the water temperature sensor driving circuits 221 to correspondingly drive the water temperature sensor switch circuits 222 to be turned on, the first water temperature signal input end and the second water temperature signal input end of the retarder electronic control unit 001 are directly connected together through the water temperature sensor switch circuits 222; when the test control circuit 10 controls the water temperature sensor driving circuits 221 to correspondingly drive the water temperature sensor switch circuits 222 to be turned off, the first water temperature signal input end and the second water temperature signal input end of the retarder electronic control unit 001 are connected together through the first resistors R; that is, when all the water temperature sensor switch circuits 222 are turned on, the first water temperature signal input terminal and the second water temperature signal input terminal are not electrically connected to any first resistor R; when all the water temperature sensor switch circuits 222 are turned off, all the first resistors R are connected in series between the first water temperature signal input end and the second water temperature signal input end; in this way, by controlling the water temperature sensor driving circuits 221 to drive the water temperature sensor switching circuits 222 to be turned on or off in a one-to-one correspondence manner, the number of the first resistors R connected in series to the first water temperature signal input terminal and the second water temperature signal input terminal can be controlled, thereby realizing control of the voltage signals collected by the first water temperature signal input terminal and the second water temperature signal input terminal.
For example, with continued reference to fig. 4, the water temperature sensor driving circuit 221 includes an inverter formed by a first transistor Q1 and a second transistor Q2, a first fet T1, a resistor R1, a resistor R2, and a resistor R3; the water temperature sensor switch circuit 222 includes a relay K1; the test control circuit 10 controls the first transistor Q1 to be conducted, the first fet T1 to be conducted, and the relay K1 to be conducted, so as to connect one of the first resistors R; it can be understood that, when simulating the water temperature signal, the multi-channel water temperature sensor driving circuit 221 is controlled to be turned on, and the multi-channel water temperature sensor switching circuit 222 is controlled to be turned on, so as to access the plurality of first resistors R, so that the water temperature sensor simulation circuit 22 simulates an output ultra-high temperature signal, so that the retarder electronic control unit 001 controls the proportional solenoid valve 31 to be completely closed according to the received ultra-high temperature signal.
Optionally, with continued reference to fig. 2, the functional signal output circuit 20 further includes an oil temperature sensor simulation circuit 23; the function signal control end comprises an oil temperature signal control end; the functional signal receiving end comprises an oil temperature signal input end; the oil temperature sensor simulation circuit 23 is electrically connected between the oil temperature signal control end and the oil temperature signal input end.
Wherein, the liquid returns to the runner again from the inner ring in the working chamber after the motion direction change in the fixed wheel, and the liquid energy that produces in the middle of this is higher. According to the technical scheme, the test control circuit 10 controls the oil temperature sensor simulation circuit 23 to output an oil temperature exceeding signal; the retarder electronic control unit 001 receives the over-oil temperature signal, controls the proportional solenoid valve 31 in the execution output circuit 30 to close, and the sampling resistor 32 in the execution output circuit 30 outputs a voltage signal correspondingly, so that the whole retarder system quits the function of retarding; at this time, the test control circuit 10 compares the received voltage signal with the expected voltage signal, if the received voltage signal matches the expected voltage signal, the retarder electronic control unit 001 controls the test instruction circuit 40 to output a correct test result, otherwise, an incorrect test result is output.
Optionally, fig. 5 is a schematic structural diagram of an oil temperature sensor simulation circuit provided in the embodiment of the present invention, as shown in fig. 5, the oil temperature sensor simulation circuit 23 includes a plurality of oil temperature sensor driving circuits 231, a plurality of oil temperature sensor switching circuits 232, and a plurality of second resistors r; the oil temperature signal control end comprises a plurality of oil temperature driving ends; the oil temperature signal input end comprises a first oil temperature signal input end and a second oil temperature signal input end; the driving end of each oil temperature sensor driving circuit 231 is electrically connected with each oil temperature driving end in a one-to-one correspondence manner; the output end of the drive circuit 231 of each oil temperature sensor is electrically connected with the control end of the switch circuit 232 of each oil temperature sensor in a one-to-one correspondence manner; the second resistors r are electrically connected between the input end and the output end of the oil temperature sensor switching circuit 232 in a one-to-one correspondence manner, and are sequentially connected between the first oil temperature signal input end and the second oil temperature signal input end in series; each oil temperature sensor driving circuit 231 is used for driving each oil temperature sensor switching circuit 232 to be turned on or off in a one-to-one correspondence manner under the control of the test control circuit.
When the test control circuit 10 controls the oil temperature sensor driving circuits 231 to correspondingly drive the water temperature sensor switching circuits 232 to be conducted, the first oil temperature signal input end and the second oil temperature signal input end of the retarder electric control unit 001 are directly connected together through the oil temperature sensor switching circuits 232; when the test control circuit 10 controls the oil temperature sensor driving circuits 231 to correspondingly drive the oil temperature sensor switching circuits 232 to be turned off, the first oil temperature signal input end and the second oil temperature signal input end of the retarder electric control unit are connected together through the second resistors r; that is, when all the oil temperature sensor switching circuits 222 are turned on, the first oil temperature signal input terminal and the second oil temperature signal input terminal are not electrically connected to any second resistor r; when all the oil temperature sensor switch circuits 222 are turned off, all the second resistors r are connected in series at the first oil temperature signal input end and the second oil temperature signal input end; thus, the oil temperature sensor driving circuits 221 are controlled to correspondingly drive the oil temperature sensor switching circuits 222 to be switched on or switched off, the number of the second resistors r connected in series to the first oil temperature signal input end and the second oil temperature signal input end can be controlled, and therefore the voltage signals collected by the first oil temperature signal input end and the second oil temperature signal input end are controlled, the oil temperature sensor simulation circuit 23 is enabled to output ultra-high temperature signals in a simulation mode, and the retarder electronic control unit 001 is enabled to control the proportional solenoid valve 31 to be completely switched off according to the received ultra-high temperature signals.
Optionally, with continued reference to fig. 2, the test system further includes a voltage acquisition circuit 50; the voltage acquisition circuit 50 is electrically connected between the voltage signal output terminal and the voltage signal receiving terminal.
The sampling resistor 32 in the execution output circuit 30 outputs a certain analog voltage signal, and the voltage acquisition circuit 50 may receive the analog voltage signal output by the sampling resistor 32 and send the voltage signal to the test control circuit 10.
Exemplarily, fig. 6 is a schematic structural diagram of a voltage acquisition circuit provided in the embodiment of the present invention, and as shown in fig. 6, the voltage acquisition circuit 50 includes a one-way diode D1, a third resistor R3, a fourth resistor R4, a second capacitor C2, and a zener diode Z1; the voltage signal output end of the execution output circuit 30 is electrically connected with the input end of the one-way diode D1; the output end of the unidirectional diode D1 is electrically connected with the first end of the third resistor R3, and the second end of the third resistor R3 is electrically connected with the first end of the fourth resistor R4, the first end of the second capacitor C2 and the first end of the zener diode Z1; the first end of the zener diode Z1 is electrically connected to the voltage signal receiving end of the test control circuit 10, and the second end of the fourth resistor R4, the second end of the second capacitor C2, and the second end of the zener diode Z1 are all grounded. The voltage acquisition circuit 50 may acquire the analog voltage signal output by the sampling resistor 32 in the execution output circuit 30 and send the analog voltage signal to the test control circuit 10, and the test control circuit 10 further includes an ADC conversion module, through which the test control circuit 10 converts the analog voltage signal into a digital voltage signal.
Optionally, with continued reference to fig. 2, the test control circuit 10 includes a single chip microcomputer 11 and a keyboard 12; the keyboard 12 is used for generating a function instruction according to an operation instruction of a user; the singlechip 11 is respectively electrically connected with an instruction output end, a function signal control end, a voltage signal receiving end and an indication signal output end of the keyboard 12; the single chip 12 is configured to control the functional signal output circuit 20 to output different functional signals according to the functional instruction, and control the test instruction circuit 40 to generate a test result of the functional diagnosis of the retarder electronic control unit 001 according to the voltage signal output by the execution output circuit 30. Wherein, the single chip microcomputer 11 can adopt an MC9S12G128 Freescale single chip microcomputer.
Optionally, with continued reference to fig. 2, the test indication circuit 40 includes a plurality of indicator lights 41 and a display 42; the test control circuit 10 is used for controlling the indicator lamps to emit light and controlling the display to display according to different voltage signals. Each indicator lamp 41 can indicate the test result of the retarder electronic control unit 001 through different lighting colors; the display 42 may display the test results for subsequent query of the test results for each failed loop.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A functional test system of an electric control unit of a retarder is characterized by comprising a test control circuit, a functional signal output circuit, an execution output circuit and a test indication circuit;
the functional signal control end of the test control circuit is electrically connected with the control end of the functional signal output circuit; the test control circuit is used for controlling the functional signal output circuit to output different functional signals;
the functional signal output end of the functional signal output circuit is electrically connected with the functional signal receiving end of the retarder electronic control unit;
the control signal output end of the retarder electric control unit is electrically connected with the control end of the execution output circuit; the retarder electric control unit is used for controlling the execution output circuit to output different voltage signals according to the function signal;
the voltage signal receiving end of the test control circuit is electrically connected with the voltage signal output end of the execution output circuit, and the indication signal output end of the test control circuit is electrically connected with the indication control end of the test indication circuit; the test control circuit is used for controlling the test indication circuit to generate a test result of the functional diagnosis of the retarder electric control unit according to the voltage signal output by the execution output circuit.
2. The retarder electronic control unit function testing system of claim 1, wherein the function signal output circuit comprises a water temperature sensor emulation circuit;
the function signal control end comprises a water temperature signal control end; the functional signal receiving end comprises a water temperature signal input end;
the water temperature sensor simulation circuit is electrically connected between the water temperature signal control end and the water temperature signal output end.
3. The retarder electronic control unit function testing system of claim 2, wherein the water temperature sensor emulation circuit comprises a plurality of water temperature sensor drive circuits, a plurality of water temperature sensor switch circuits, and a plurality of first resistors;
the water temperature signal control end comprises a plurality of water temperature driving ends; the water temperature signal input end comprises a first water temperature signal input end and a second water temperature signal input end;
the driving ends of the water temperature sensor driving circuits are electrically connected with the water temperature driving ends in a one-to-one correspondence manner; the output end of the driving circuit of each water temperature sensor is electrically connected with the control end of the switch circuit of each water temperature sensor in a one-to-one correspondence manner; the first resistors are electrically connected between the input end and the output end of the water temperature sensor switch circuit in a one-to-one correspondence manner, and are sequentially connected between the first water temperature signal input end and the second water temperature signal input end in series;
and the water temperature sensor driving circuits are used for driving the water temperature sensor switching circuits to be switched on or switched off in a one-to-one correspondence manner under the control of the test control circuit.
4. The retarder electronic control unit function testing system of claim 1, wherein the function signal output circuit comprises an oil temperature sensor emulation circuit;
the function signal control end comprises an oil temperature signal control end; the functional signal receiving end comprises an oil temperature signal input end;
the oil temperature sensor simulation circuit is electrically connected between the oil temperature signal control end and the oil temperature signal input end.
5. The retarder electronic control unit function testing system according to claim 4, wherein the oil temperature sensing simulation circuit comprises a plurality of oil temperature sensor driving circuits, a plurality of oil temperature sensor switching circuits, and a plurality of second resistors;
the oil temperature signal control end comprises a plurality of oil temperature driving ends; the oil temperature signal input end comprises a first oil temperature signal input end and a second oil temperature signal input end;
the driving end of each oil temperature sensor driving circuit is electrically connected with each oil temperature driving end in a one-to-one correspondence manner; the output end of the driving circuit of each oil temperature sensor is electrically connected with the control end of the switching circuit of each oil temperature sensor in a one-to-one correspondence manner; the second resistors are electrically connected between the input end and the output end of the oil temperature sensor switching circuit in a one-to-one correspondence manner, and are sequentially connected between the first oil temperature signal input end and the second oil temperature signal input end in series;
and the oil temperature sensor driving circuits are used for driving the oil temperature sensor switching circuits to be switched on or switched off in a one-to-one correspondence manner under the control of the test control circuit.
6. The retarder electronic control unit function testing system of claim 1, wherein the function signal output circuit further comprises an air pressure sensor simulation circuit;
the function signal control end also comprises an air pressure signal control end, and the function signal receiving end also comprises an air pressure signal receiving end;
the air pressure sensor simulation circuit is electrically connected between the air pressure signal control end and the air pressure signal receiving end;
the test control circuit also comprises a vehicle speed signal output end and an accelerator pedal signal output end; the retarder electric control unit also comprises a vehicle speed signal receiving end and an accelerator pedal signal receiving end; the vehicle speed signal receiving end is electrically connected with the vehicle speed signal output end, and the accelerator pedal signal receiving end is electrically connected with the accelerator pedal signal output end;
the retarder electronic control unit is also used for controlling the execution output circuit to output a voltage signal according to the simulation vehicle speed signal and the simulation accelerator pedal release signal output by the test control circuit;
the test control circuit is also used for controlling the air pressure sensor simulation circuit to output an air pressure sensing signal according to the voltage signal output by the execution output circuit;
the retarder electric control unit is also used for controlling the execution output circuit to output a voltage signal according to the air pressure sensing signal.
7. The retarder electronic control unit function testing system of claim 6, wherein the air pressure sensor comprises a filter and an operational amplifier;
the filter is electrically connected between the air pressure signal control end and the positive phase input end of the operational amplifier; the negative phase input end of the operational amplifier is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is also electrically connected with the air pressure signal receiving end.
8. The retarder electronic control unit function testing system of claim 1, further comprising: a voltage acquisition circuit; the voltage acquisition circuit is electrically connected between the voltage signal output end and the voltage signal receiving end.
9. The retarder electronic control unit function testing system of claim 1, wherein the test control circuit comprises a single chip microcomputer and a keyboard;
the keyboard is used for generating a function instruction according to an operation instruction of a user;
the single chip microcomputer is electrically connected with the instruction output end of the keyboard, the function signal control end, the voltage signal receiving end and the indication signal output end respectively; the single chip microcomputer is used for controlling the functional signal output circuit to output different functional signals according to the functional instruction, and controlling the test indicating circuit to generate a test result of the functional diagnosis of the retarder electric control unit according to the voltage signal output by the execution output circuit.
10. The retarder electronic control unit function testing system of claim 1, wherein the test indication circuit comprises a plurality of indicator lights and a display;
the test control circuit is used for controlling the indicator lamps to emit light and controlling the display to display according to the different voltage signals.
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| CN202121420912.6U CN214751467U (en) | 2021-06-24 | 2021-06-24 | Retarder electric control unit function test system |
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| CN202121420912.6U CN214751467U (en) | 2021-06-24 | 2021-06-24 | Retarder electric control unit function test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115303239A (en) * | 2022-08-09 | 2022-11-08 | 一汽解放汽车有限公司 | Vehicle brake system control method, apparatus, device, medium, and product |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115303239A (en) * | 2022-08-09 | 2022-11-08 | 一汽解放汽车有限公司 | Vehicle brake system control method, apparatus, device, medium, and product |
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