CN113910908A - New energy automobile driving motor - Google Patents
New energy automobile driving motor Download PDFInfo
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- CN113910908A CN113910908A CN202111147534.3A CN202111147534A CN113910908A CN 113910908 A CN113910908 A CN 113910908A CN 202111147534 A CN202111147534 A CN 202111147534A CN 113910908 A CN113910908 A CN 113910908A
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- 238000001514 detection method Methods 0.000 claims abstract description 68
- 230000017525 heat dissipation Effects 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 10
- 230000003321 amplification Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
Abstract
The invention discloses a new energy automobile driving motor, which effectively solves the problem that the motor cannot be effectively cooled by adopting an air cooling heat dissipation mode in the prior art, and comprises a temperature detection circuit, a vehicle speed detection circuit and an output circuit, wherein the temperature detection circuit detects a temperature signal of the motor by using a temperature sensor U1, subtracts and compares the temperature signal, starts the vehicle speed detection circuit, detects a vehicle speed signal of a new energy automobile, subtracts the vehicle speed signal to obtain a comparison signal, obtains a heat dissipation signal and an alarm signal by using a difference signal, and transmits the alarm signal to an ECU (electronic control unit), thereby providing a better heat dissipation mode for the motor.
Description
Technical Field
The invention relates to the field of new energy automobile protection, in particular to a new energy automobile driving motor.
Background
Research shows that the temperature of the motor influences the service life of the motor, and a traditional motor temperature detection method is to inlay a temperature sensor in the motor and obtain temperature parameters through direct measurement. However, this method depends on the accuracy of the temperature sensors and the motor structure, and is limited in the number and mounting positions of the temperature sensors, failing to provide sufficient thermal protection for the motor.
At present, the heat dissipation of a new energy automobile motor mostly adopts an air cooling mode, the heat dissipation is carried out through a radiator (mostly a heat dissipation fan) or directly by utilizing the air cooling mode without the radiator, namely, the heat dissipation is carried out through the air flow when the automobile runs, when the air cooling heat dissipation mode is adopted, because the traditional motor temperature detection method cannot well detect the temperature comprehensively, when the temperature distribution is uneven, and the speed of the automobile is higher at the moment, a large amount of heat of the motor is taken away by the rapid flow of the air, because the heating position of the motor is not consistent with the position of a temperature sensor, the temperature display measured by the temperature sensor at the moment is normal, but the temperature of the abnormal heating position of the actual motor is too high, a warning control system and a driver need to pay attention to, and the problem is not solved by the technical scheme in the prior art.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a new energy automobile driving motor, which effectively solves the problem that the motor cannot be effectively cooled by adopting an air cooling heat dissipation mode in the prior art.
The technical scheme includes that the motor comprises a temperature detection circuit, a vehicle speed detection circuit and an output circuit, the temperature detection circuit detects a temperature signal of the motor by using a temperature sensor U1, the temperature signal is subjected to subtraction and comparison operation, the vehicle speed detection circuit is started, the vehicle speed detection circuit is used for detecting a vehicle speed signal of the new energy vehicle and performing subtraction operation on the vehicle speed signal to obtain a comparison signal, and the output circuit obtains a heat dissipation signal and an alarm signal by using a difference signal and transmits the alarm signal to an ECU.
Furthermore, the temperature detection circuit comprises a temperature sensor U1, a pin 1 of the temperature sensor U1 is respectively connected with one end of a resistor R17, one end of a resistor R2 and a positive power supply VCC, a pin 2 of the temperature sensor U1 is respectively connected with one end of a resistor R14 and one end of a bidirectional voltage regulator D4, the other end of a resistor R14 is respectively connected with the same-phase end of an operational amplifier U2A, one end of a resistor R18 and the anode of a thyristor Q2, the inverting end of the operational amplifier U2A is respectively connected with one end of a resistor R6 and the other end of a resistor R17, the output end of the operational amplifier U2A is connected with the anode of a diode D2, the cathode of a diode D2 is respectively connected with one end of a capacitor C2 and the control electrode of a thyristor Q2, the cathode of a thyristor Q2 is connected with one end of a resistor R1, the other end of a resistor R1 is respectively connected with one end of a resistor R1 and the same-phase end of an operational amplifier U6 1, and the inverting end of an inverting amplifier U6 is respectively connected with the resistor R1, One end of the resistor R13, the other end of the resistor R13 are respectively connected with the other end of the resistor R3, the other end of the capacitor C2, the other end of the resistor R18, the other end of the bidirectional voltage regulator tube D4 and the upper end of the resistor R6 in parallel and are connected with the ground.
Further, the vehicle speed detection circuit comprises a diode D1, the anode of the diode D1 is connected to one end of a resistor R5, the base of a transistor Q1 and the output end of an operational amplifier U6A in the temperature detection circuit, the collector of a transistor Q1 is connected to pin 1 of a vehicle speed sensor U3 and one end of a resistor R8, the other end of a resistor R8 is connected to one end of a capacitor C1, the emitter of a transistor Q1 is connected to one end of a resistor R5, one end of a resistor R11 and one end of a resistor R2 in the temperature detection circuit are connected to a positive power VCC, pin 2 of the vehicle speed sensor U3 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to the same-phase end of an operational amplifier U7A, the inverting end of an operational amplifier U7A is connected to the other end of a resistor R11 and one end of a resistor R10, and the other end of a resistor R10 is connected to pin 3 of a vehicle speed sensor U1 and the other end of a capacitor C1, The other end of the resistor R3 in the temperature detection circuit is connected in parallel to ground.
Further, the output circuit includes a resistor R9, one end of the resistor R9 is respectively connected to the anode of the diode D3, the base of the triode Q3, and the output end of the operational amplifier U7A in the vehicle speed detection circuit, the cathode of the diode D2 is respectively connected to the pin 1 of the and gate U4A and one end of the relay K1, the pin 16 of the and gate U4A is connected to the cathode of the diode D1 in the vehicle speed detection circuit, the output end of the and gate U4A is connected to the pin 2 of the switch S1, the pin 3 of the switch S1 is respectively connected to one end of the resistor R12 and the collector of the transistor Q3, the emitter of the transistor Q3 is respectively connected to the other end of the resistor R9, one end of the resistor R11 in the vehicle speed detection circuit, one end of the resistor R2 in the temperature detection circuit is connected to the positive polarity power VCC, the pin 1 of the switch S1 is connected to one end of the resistor R15, the other end of the resistor R15 is connected to the phase-matching amplifier U5A, the output end of the operational amplifier U5A is connected with the inverting terminal of the operational amplifier U5A, the ECU and the radiator, respectively, and the other end of the resistor R12 is connected with the other end of the relay K1, the other end of the capacitor C1 in the vehicle speed detection circuit and the other end of the resistor R3 in the temperature detection circuit in parallel and connected with the ground.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
(1) the temperature signal detected by the temperature sensor U1 is compared with the other path of temperature signal to detect whether the motor of the new energy automobile is in a non-uniform temperature state or not and whether the temperature signal exceeds a temperature threshold signal or not, when the temperature signal exceeds the temperature threshold signal, the radiator is started through the vehicle speed detection circuit and the output circuit, and an air-cooled radiating mode is assisted by the radiator to realize a good radiating effect, so that the problem that the motor cannot be effectively radiated by adopting the air-cooled radiating mode in the prior art is solved; meanwhile, the waste of the electric quantity of the battery caused by the fact that the radiator is started all the time is avoided, the selective starting of the radiator can ensure the heat dissipation and optimize the electric quantity.
(2) The speed of a new energy automobile is detected through the speed detection circuit, whether the new energy automobile is in a high-speed state or not is judged, when the new energy automobile is in the high-speed state, an output circuit is used for outputting an alarm signal to the ECU to remind a driver that the temperature of a motor is too high at the moment, the radiator is started to dissipate heat, the speed needs to be reduced to achieve a good heat dissipation effect, and the speed detection circuit is arranged to improve the heat dissipation effect of the radiator started by the output circuit.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a new energy automobile driving motor, the motor includes temperature detection circuitry, speed of a motor vehicle detection circuit, output circuit.
The temperature detection circuit detects a temperature signal on the motor by using a temperature sensor U1, the detected temperature signal is transmitted to an operational amplifier U2A through a resistor R14 to be subtracted with another temperature signal, wherein the another temperature signal is provided by dividing voltage through a resistor R6 and a resistor R17, the resistor R6 is a PTCR type thermistor to detect another temperature signal, when the operational amplifier U2A cannot conduct a diode D2, the motor does not have a problem of obvious temperature unevenness, when the operational amplifier U2A conducts a diode D2, the motor has a problem of obvious temperature unevenness, at this time, the diode D2 conducts a thyristor Q2 through a capacitor C2, the thyristor Q2 transmits the temperature signal to the operational amplifier U6A through a resistor R1, the operational amplifier U6A compares the temperature signal with a temperature threshold signal to detect whether the temperature on the motor exceeds a threshold value, wherein the temperature threshold value is provided by dividing voltage through a resistor R2 and a resistor R13, the bidirectional voltage regulator tube D4 is used for inhibiting a surge phenomenon caused when the amplitude of a temperature signal detected by the temperature sensor U1 is too high, a temperature detection circuit is protected, and the operational amplifier U6A starts the vehicle speed detection circuit.
The temperature sensor U1 and the PTCR thermistor are both located inside the motor stator and symmetrically distributed on the circumferential position, the temperature sensor type, the measuring position and the measuring principle of the temperature sensor U1 are all the prior art and are not repeated herein, and the PTCR thermistor is located on the surface of the stator core.
The temperature detection circuit comprises a temperature sensor U1, wherein a pin 1 of the temperature sensor U1 is respectively connected with one end of a resistor R17 and one end of a resistor R2 and is connected with a positive power supply VCC, a pin 2 of the temperature sensor U1 is respectively connected with one end of a resistor R14 and one end of a bidirectional voltage regulator tube D4, the other end of a resistor R14 is respectively connected with the in-phase end of an operational amplifier U2A, one end of a resistor R18 and the anode of a thyristor Q2, the inverting end of the operational amplifier U2A is respectively connected with one end of a resistor R6 and the other end of a resistor R17, the output end of the operational amplifier U2A is connected with the anode of a diode D2, the cathode of a diode D2 is respectively connected with one end of a capacitor C2 and the control electrode of a thyristor Q2, the cathode of a thyristor Q2 is connected with one end of a resistor R1, the other end of a resistor R1 is respectively connected with one end of a resistor R1 and the in-phase end of an operational amplifier U6 1, One end of the resistor R13, the other end of the resistor R13 are respectively connected with the other end of the resistor R3, the other end of the capacitor C2, the other end of the resistor R18, the other end of the bidirectional voltage regulator tube D4 and the upper end of the resistor R6 in parallel and are connected with the ground.
The vehicle speed detection circuit is conducted by using an operational amplifier U6A in the temperature detection circuit, when the operational amplifier U6A conducts a diode D1, it indicates that the temperature in the range detected by a temperature sensor U1 on the motor is overhigh at the moment, the diode D1 inputs a first high level to the output circuit, and when the operational amplifier U6A conducts a triode Q1, it indicates that the temperature on the motor is uneven but is in a normal state, the triode Q1 conducts a vehicle speed sensor U3, the vehicle speed sensor U1 starts to detect the vehicle speed of the new energy vehicle, the vehicle speed sensor is a mature technology, which is not described in detail herein, the vehicle speed sensor capable of outputting an analog vehicle speed signal in the prior art can be used, the vehicle speed signal is transmitted to the operational amplifier U7A by using a resistor R4, the operational amplifier U7A compares the vehicle speed signal with a standard vehicle speed signal to obtain a comparison signal, wherein the standard vehicle speed signal is a high-speed threshold value, the voltage is divided by a resistor R11 and a resistor R10 to provide, and an operational amplifier U7A starts an output circuit.
The vehicle speed detection circuit comprises a diode D1, the anode of the diode D1 is respectively connected with one end of a resistor R5, the base of a triode Q1 and the output end of an operational amplifier U6A in the temperature detection circuit, the collector of the triode Q1 is connected with a pin 1 of a vehicle speed sensor U3 and one end of a resistor R8, the other end of the resistor R8 is connected with one end of a capacitor C1, the emitter of the triode Q1 is respectively connected with one end of a resistor R5 and one end of a resistor R11, one end of a resistor R2 in the temperature detection circuit is connected with a positive power supply VCC, a pin 2 of a vehicle speed sensor U3 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the in-phase end of an operational amplifier U7A, the inverting end of the operational amplifier U7A is respectively connected with the other end of a resistor R11 and one end of a resistor R10, and the other end of the resistor R10 is respectively connected with a pin 3 of a vehicle speed sensor U1, the other end of a capacitor C1 and the other end of a resistor R3 in the temperature detection circuit and is connected with the ground in parallel.
The output circuit is conducted by using a comparison signal output by an operational amplifier U7A in the vehicle speed detection circuit, when the operational amplifier U7A conducts a triode Q3, a triode Q3 outputs a heat dissipation signal, the heat dissipation signal is transmitted to a pin 1 through a pin 3 of a switch S1, the heat dissipation signal is transmitted to an operational amplifier U5A through a resistor R15 to follow and output to an ECU, and meanwhile, a radiator is started to cool down a motor, so that a better cooling effect is achieved, wherein the switch S1 is a pin switch of a relay K1, when the operational amplifier U7A conducts a diode D3, the vehicle speed of the new energy vehicle is over high at the moment, the operational amplifier U7A conducts a first high level to a pin 1 of an AND gate U4A through a diode D3, when a pin 16 of the AND gate U4A receives a first high level transmitted by a diode D1 at the same time, the AND gate U4A conducts an alarm signal, and the diode D3 conducts the relay 1 at the moment, the 1 pin of the switch S1 is connected with the 2 pin, the alarm signal is transmitted to the operation and amplification device U5A through the resistor R15, the operation and amplification device U5A outputs the signal to the ECU after following, and the radiator is started, so that the driver is reminded that the temperature of the motor is too high at the moment, the radiator is started to dissipate heat, and the speed needs to be reduced to achieve a good heat dissipation effect.
The output circuit comprises a resistor R9, one end of a resistor R9 is respectively connected with the anode of a diode D3, the base of a triode Q3 and the output end of an operational amplifier U7A in the vehicle speed detection circuit, the cathode of a diode D2 is respectively connected with a pin 1 of an AND gate U4A and one end of a relay K1, a pin 16 of the AND gate U4A is connected with the cathode of a diode D1 in the vehicle speed detection circuit, the output end of the AND gate U4A is connected with a pin 2 of a switch S5857323, a pin 3 of the switch S1 is respectively connected with one end of a resistor R12 and the collector of a triode Q3, the emitter of the triode Q3 is respectively connected with the other end of the resistor R9, one end of a resistor R11 in the vehicle speed detection circuit and one end of a resistor R2 in the temperature detection circuit and is connected with a positive polarity power supply VCC, a pin 1 of a switch S1 is connected with one end of a resistor R15, the other end of the resistor R15 is respectively connected with the homophase end of an operational amplifier U36A, and the output end of the operational amplifier U A is respectively connected with the output end of the operational amplifier U A, The other end of the resistor R12 is connected with the other end of the relay K1, the other end of the capacitor C1 in the vehicle speed detection circuit and the other end of the resistor R3 in the temperature detection circuit in parallel connection with the ECU and the radiator.
When the temperature detection circuit is used specifically, the temperature sensor U1 is used to detect the temperature signal on the motor, the detected temperature signal is transmitted to the operational amplifier U2A through the resistor R14 to be subtracted from another temperature signal, wherein the other temperature signal is provided by dividing the voltage through the resistor R6 and the resistor R17, when the operational amplifier U2A cannot turn on the diode D2, it indicates that there is no obvious temperature unevenness in the motor, and when the operational amplifier U2A turns on the diode D2, it indicates that there is obvious temperature unevenness in the motor, at this time, the diode D2 turns on the thyristor Q2 through the capacitor C2, the thyristor Q2 transmits the temperature signal to the operational amplifier U6A through the resistor R1, the operational amplifier U6A compares the temperature signal with the temperature threshold signal, detects that the temperature on the motor exceeds the threshold, the operational amplifier U6A starts the vehicle speed detection circuit, the vehicle speed detection circuit is conducted by an operational amplifier U6A in the temperature detection circuit, when an operational amplifier U6A conducts a diode D1, the diode D1 inputs a first high level to the output circuit, when the operational amplifier U6A conducts a transistor Q1, a transistor Q1 conducts a vehicle speed sensor U3, a vehicle speed sensor U1 starts to detect the vehicle speed of the new energy vehicle, the vehicle speed signal is transmitted to an operational amplifier U7A by a resistor R4, the operational amplifier U7A compares the vehicle speed signal with a standard vehicle speed signal (the standard signal is a vehicle speed threshold signal, such as 100km/h), the output circuit is started by the operational amplifier U7A, the output circuit is conducted by an operational amplifier U7A in the vehicle speed detection circuit, when the operational amplifier U7A conducts the transistor Q3, the transistor Q3 outputs a heat dissipation signal, the heat dissipation signal is transmitted to an operational U5 ECU 5A by a resistor R15 to follow the amplifier, meanwhile, the radiator is started to cool the motor, a better cooling effect is achieved, when the operational amplifier U7A conducts the diode D3, it is indicated that the speed of the new energy automobile is too high at this time, the operational amplifier U7A outputs a second high level to the pin 1 of the AND gate U4A through the diode D3, when the pin 16 of the AND gate U4A receives the first high level transmitted by the diode D1, the AND gate U4A is conducted, an alarm signal is output, the diode D3 conducts the relay K1 at this time, the pin 1 of the switch S1 is connected with the pin 2, the alarm signal is transmitted to the operational amplifier U5A through the resistor R15, the operational amplifier U5A outputs the signal to the ECU after following the signal, the radiator is started, a driver is reminded that the temperature of the motor is too high at this time, the radiator is started to dissipate heat, and the speed needs to be reduced to achieve a better heat dissipation effect.
The temperature signal detected by the temperature sensor U1 is compared with the other path of temperature signal to detect whether the motor of the new energy automobile is in a non-uniform temperature state or not, and whether the temperature signal exceeds a temperature threshold signal or not is detected, when the temperature signal exceeds the temperature threshold signal, the radiator is started through the vehicle speed detection circuit and the output circuit, and the radiator is used for assisting an air-cooling radiating mode to realize a better radiating effect, so that the problem that the motor cannot be effectively radiated by adopting the air-cooling radiating mode in the prior art is avoided.
The speed of a new energy automobile is detected through the speed detection circuit, whether the new energy automobile is in a high-speed state or not is judged, when the new energy automobile is in the high-speed state, an output circuit is used for outputting an alarm signal to the ECU to remind a driver that the temperature of a motor is too high at the moment, the radiator is started to dissipate heat, the speed needs to be reduced to achieve a good heat dissipation effect, and the speed detection circuit is arranged to improve the heat dissipation effect of the radiator started by the output circuit.
Claims (4)
1. The new energy automobile driving motor is characterized by comprising a temperature detection circuit, a vehicle speed detection circuit and an output circuit, wherein the temperature detection circuit detects a temperature signal of the motor by using a temperature sensor U1, the temperature signal is subjected to subtraction and comparison operation, the vehicle speed detection circuit is started, the vehicle speed detection circuit is used for detecting a vehicle speed signal of a new energy automobile and performing subtraction operation on the vehicle speed signal to obtain a comparison signal, and the output circuit obtains a heat dissipation signal and a warning signal by using a difference signal and transmits the warning signal to an ECU.
2. The new energy automobile driving motor as claimed in claim 1, wherein the temperature detection circuit comprises a temperature sensor U1, a pin 1 of the temperature sensor U1 is connected to one end of a resistor R17 and one end of a resistor R2 respectively and is connected to a positive power source VCC, a pin 2 of the temperature sensor U1 is connected to one end of a resistor R14 and one end of a bidirectional regulator D4 respectively, the other end of the resistor R14 is connected to the non-inverting end of an operational amplifier U2A, one end of a resistor R18 and the anode of a thyristor Q2 respectively, the inverting end of the operational amplifier U2A is connected to one end of the resistor R6 and the other end of the resistor R17 respectively, the output end of the operational amplifier U2A is connected to the anode of a diode D2, the cathode of the diode D2 is connected to one end of a capacitor C2 and the control electrode of a thyristor Q2 respectively, the cathode of the thyristor Q2 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to one end of the resistor R3 respectively, The non-inverting end of the operational amplifier U6A and the inverting end of the operational amplifier U6A are respectively connected with the other end of the resistor R2 and one end of the resistor R13, and the other end of the resistor R13 is respectively connected with the other end of the resistor R3, the other end of the capacitor C2, the other end of the resistor R18, the other end of the bidirectional voltage regulator tube D4 and the upper end of the resistor R6 and connected in parallel to the ground.
3. The new energy automobile driving motor as claimed in claim 1, wherein the vehicle speed detection circuit comprises a diode D1, the anode of the diode D1 is connected to one end of a resistor R5, the base of a transistor Q1, and the output end of an amplifier U6A in the temperature detection circuit, the collector of a transistor Q1 is connected to pin 1 of a vehicle speed sensor U3 and one end of a resistor R8, the other end of the resistor R8 is connected to one end of a capacitor C1, the emitter of a transistor Q1 is connected to one end of a resistor R5, one end of a resistor R11, one end of a resistor R2 in the temperature detection circuit and connected to a positive power source VCC, pin 2 of the vehicle speed sensor U3 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to the same phase end of an amplifier U7A, the opposite phase end of the amplifier U7A is connected to the other end of a resistor R11 and one end of a resistor R10, and the other end of the resistor R10 is connected to pin 3 of a vehicle speed sensor U1 The other end of the capacitor C1 and the other end of the resistor R3 in the temperature detection circuit are connected in parallel to ground.
4. The new energy automobile driving motor as claimed in claim 1, wherein the output circuit includes a resistor R9, one end of the resistor R9 is connected to the positive terminal of a diode D3, the base of a transistor Q3, the output terminal of an operator U7A in the vehicle speed detection circuit, the negative terminal of a diode D2 is connected to the 1 pin of an and gate U4A and one end of a relay K1, the 16 pin of the and gate U4A is connected to the negative terminal of a diode D1 in the vehicle speed detection circuit, the output terminal of the and gate U4A is connected to the 2 pin of a switch S1, the 3 pin of the switch S1 is connected to one end of a resistor R12 and the collector of a transistor Q3, the emitter of the transistor Q3 is connected to the other end of a resistor R9, one end of a resistor R11 in the vehicle speed detection circuit and one end of a resistor R2 in the temperature detection circuit, the 1 pin of a switch S1 is connected to one end of a resistor R15, the other end of the resistor R15 is connected with the in-phase end of the operational amplifier U5A, the output end of the operational amplifier U5A is respectively connected with the inverting end of the operational amplifier U5A, the ECU and the radiator, and the other end of the resistor R12 is respectively connected with the other end of the relay K1, the other end of the capacitor C1 in the vehicle speed detection circuit and the other end of the resistor R3 in the temperature detection circuit and is connected with the ground in parallel.
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