CN104713605B - Electric automobile cooling system coolant rate deficiency method for diagnosing faults - Google Patents
Electric automobile cooling system coolant rate deficiency method for diagnosing faults Download PDFInfo
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- CN104713605B CN104713605B CN201310689073.1A CN201310689073A CN104713605B CN 104713605 B CN104713605 B CN 104713605B CN 201310689073 A CN201310689073 A CN 201310689073A CN 104713605 B CN104713605 B CN 104713605B
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Abstract
The invention discloses a kind of electric automobile cooling system coolant rate deficiency method for diagnosing faults, completed by demarcating a temperature rise table, according to the power device temperature of the motor in electric automobile driver detected in real time, power device temperature rise actual in the unit interval is calculated in real time, with according to coolant temperature, power device temperature, power consumption summation, which looks into temperature rise table and obtains rational power device temperature rise in the unit interval, in the power device unit interval is compared, it is too fast that if power device temperature rise actual in the unit interval is calculated in real time, then illustrate coolant rate deficiency.The electric automobile cooling system coolant rate deficiency method for diagnosing faults of the present invention, can be not equipped with diagnosing the hardware cost that whether current coolant rate is insufficient, reduces by software in the case of flow sensor on vehicle.
Description
Technical field
It is of the invention and electronic（Pure electric vehicle, hybrid power）Automotive engineering, more particularly to a kind of electric automobile cooling system are cold
But flow quantity deficiency method for diagnosing faults.
Background technology
It is electronic（Pure electric vehicle, hybrid power）The motor driver PEU of automobile can produce substantial amounts of heat when work,
These heats can be dissipated by the way of water cooling.But when the cooling system coolant rate of electric automobile is insufficient, meeting
Cause the power device of motor driver（Such as IGBT, insulated gate bipolar transistor）Temperature is excessive, so as to motor driving occur
The phenomenon of device excess temperature.
Common electric-motor drive unit PEU excess temperature protection methods are, when the power device temperature of motor driver PEU exceedes
After limit value, output torque is limited, so as to reach the defencive function to motor driver PEU.
If the failure of the cooling system coolant rate deficiency of electric automobile is diagnosed to be, it is necessary to add in a cooling system
Become a mandarin quantity sensor, this can greatly increase the cost of cooling system.
The cooling system used on electric automobile, due to cost the problem of, will not usually install flow sensor additional to supervise at any time
The flow of coolant is surveyed, so while situations such as coolant rate is insufficient caused by a variety of causes is with regard to None- identified and diagnosis.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of electric automobile cooling system coolant rate deficiency failure to examine
Disconnected method, can be not equipped with current coolant rate being diagnosed by software whether in the case of flow sensor on vehicle
Deficiency, reduces the hardware cost of system.
In order to solve the above technical problems, electric automobile cooling system coolant rate deficiency fault diagnosis provided by the invention
Method, comprises the following steps：
One, demarcates a temperature rise table, including power device temperature rise, coolant temperature, power device temperature, unit interval internal strength
Four parameters of rate device power consumption summation；Each power device temperature rise, corresponding to a coolant temperature, a power device temperature and one
Power consumption summation in the power device unit interval；
Two, detect the coolant temperature of electric automobile cooling system, the power device of motor in electric automobile driver in real time
Temperature, and power consumption summation in the power device unit interval of calculating motor in electric automobile driver in real time；
Coolant temperature that three, are obtained according to step 2, power device temperature, power consumption is total in the power device unit interval
With by looking into the temperature rise table, obtain rational power device temperature rise in the unit interval；
The power device temperature of the motor in electric automobile driver detected in real time according to step 2, is calculated unit in real time
Actual power device temperature rise in time；
If actual power device temperature rise exceedes rational power device temperature rise in the unit interval and reaches in four, unit interval
Setting value, then export electric automobile cooling system coolant rate deficiency fault message.
Preferably, in step 3, the corresponding power device temperature rise temperature rise table will be looked into obtaining, then carry out linearization process
Obtain rational power device temperature rise in the unit interval.
Preferably, the scaling method of the temperature rise table is：
Keep the coolant temperature of electric automobile cooling system, the power device temperature of motor in electric automobile driver not
Become, change the power consumption of the power device of motor in electric automobile driver by varying the output torque of motor in electric automobile, survey
Power consumption summation in the power device unit interval of amount motor in electric automobile driver reaches N number of different expection power consumption number and divides
Power device temperature rise in the not corresponding unit interval, record data to the relevant position of the temperature rise table of N*N*N；
Keep coolant temperature, the output torque of motor in electric automobile of electric automobile cooling system constant, by varying
The power device temperature of motor in electric automobile driver, in the power device unit interval for measuring motor in electric automobile driver
Power consumption summation reach N number of different expection power consumption number power device temperature rise in the corresponding unit interval, record data
To the relevant position of the temperature rise table of N*N*N；
Keep power device temperature, the output torque of motor in electric automobile of motor in electric automobile driver constant, pass through
Change the coolant temperature of electric automobile cooling system, in the power device unit interval for measuring motor in electric automobile driver
Power consumption summation reach N number of different expection power consumption number power device temperature rise in the corresponding unit interval, record data
To the relevant position of the temperature rise table of N*N*N.
Preferably, if step 4 exports electric automobile cooling system coolant rate deficiency fault message, to electronic
The output torque of electric motor of automobile is limited..
The present invention electric automobile cooling system coolant rate deficiency method for diagnosing faults, by demarcate a temperature rise table come
Complete, according to the power device temperature of the motor in electric automobile driver detected in real time, be calculated in real time in the unit interval real
The power device temperature rise on border, and according to coolant temperature, power device temperature, power consumption summation looks into temperature in the power device unit interval
Liter table obtains rational power device temperature rise in the unit interval and is compared, if be calculated in real time actual in the unit interval
Power device temperature rise is too fast, then illustrates coolant rate deficiency.After the failure of coolant rate deficiency is diagnosed to be, then to electronic
The output torque of electric motor of automobile is limited, so that achieve the purpose that limiting motor driver output power, motor driver
Power device temperature is not up to upper limit value.Utilize the electric automobile cooling system coolant rate deficiency fault diagnosis of the present invention
Whether not method, can be not equipped with current coolant rate being diagnosed by software in the case of flow sensor on vehicle
Foot, the hardware cost reduced, and can be in the case where the power device temperature of motor driver is not reaching to upper limit value to electricity
Machine output torque is limited, and carries out overheat protector to motor driver in advance.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the required attached drawing of the present invention is made below simple
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, without creative efforts, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is one embodiment of the electric automobile cooling system coolant rate deficiency method for diagnosing faults signal of the present invention
Figure；
Fig. 2 is the temperature-responsive speed of the temperature sensor of power device and power consumption summation in the unit interval of power device
Relation schematic diagram；
Fig. 3 is that the temperature-responsive speed of the temperature sensor of power device and the Current Temperatures relation of power device are illustrated
Figure；
Fig. 4 is the temperature-responsive speed of the temperature sensor of power device and the present flow rate relation schematic diagram of coolant；
Fig. 5 is the temperature-responsive speed of the temperature sensor of power device and the Current Temperatures relation schematic diagram of coolant.
Embodiment
Below in conjunction with attached drawing, clear, complete description is carried out to the technical solution in the present invention, it is clear that described
Embodiment is the part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this area is general
All other embodiment that logical technical staff is obtained on the premise of creative work is not made, belongs to protection of the present invention
Scope.
Embodiment one
Electric automobile cooling system coolant rate deficiency method for diagnosing faults, as shown in Figure 1, comprising the following steps：
One, demarcates a temperature rise table, including power device temperature rise, coolant temperature, power device temperature, unit interval internal strength
Four parameters of rate device power consumption summation；Each power device temperature rise, corresponding to a coolant temperature, a power device temperature and one
Power consumption summation in the power device unit interval；
Two, detect the coolant temperature of electric automobile cooling system, the power device of motor in electric automobile driver in real time
Temperature, and power consumption summation in the power device unit interval of calculating motor in electric automobile driver in real time；
Coolant temperature that three, are obtained according to step 2, power device temperature, power consumption is total in the power device unit interval
With by looking into the temperature rise table, obtain rational power device temperature rise in the unit interval；
The power device temperature of the motor in electric automobile driver detected in real time according to step 2, is calculated unit in real time
Actual power device temperature rise in time；
If actual power device temperature rise exceedes rational power device temperature rise in the unit interval and reaches in four, unit interval
Setting value, then export electric automobile cooling system coolant rate deficiency fault message.
Preferably, in step 3, the corresponding power device temperature rise temperature rise table will be looked into obtaining, then carry out linearization process
Obtain rational power device temperature rise in the unit interval.Since temperature rise table is some discrete values, when reality diagnoses, temperature rise is being looked into
After the corresponding power device temperature rise that table obtains, it can be obtained in the more accurately unit interval reasonably by carrying out linearization process
Power device temperature rise.
Preferably, power device is IGBT（Insulated gate bipolar transistor）.Coolant temperature, power device temperature can be with
Gathered respectively by temperature sensor.
The temperature-responsive speed of the temperature sensor of the power device of motor in electric automobile driver, with motor in electric automobile
Power consumption summation, Current Temperatures in the unit interval of the power device of driver, and the coolant of electric automobile cooling system
Present flow rate, Current Temperatures have certain relation, for a real system, what its relation was to determine, from qualitatively angle
Have Fig. 2, Fig. 3, Fig. 4, Fig. 5 represent respectively the temperature sensor of power device temperature-responsive speed and power device unit when
Interior power consumption summation, Current Temperatures, and with the present flow rate of coolant, the relation of Current Temperatures.
The temperature-responsive speed and the relation of these variables of the temperature sensor of power device are extremely complex, it is difficult to pass through
One functional relation represents.For the water pump control method of switching mode, flow only has a value, it is possible to by testing,
Come nominal power device temperature rise, most end form according to the Current Temperatures of the current power consumption of power device, Current Temperatures, and coolant
Into a form.Analyzed more than, the temperature-responsive speed of the temperature sensor of the power device of motor in electric automobile driver
Degree（Power device temperature rise）Only and in coolant temperature, and the unit interval of power device power consumption summation, Current Temperatures are related,
By individually being set to these three parameters, the temperature rise table of the power device of motor in electric automobile driver can be obtained.
The electric automobile cooling system coolant rate deficiency method for diagnosing faults of embodiment one, by demarcating a temperature rise table
To complete, according to the power device temperature of the motor in electric automobile driver detected in real time, it is calculated in real time in the unit interval
Actual power device temperature rise, and according to coolant temperature, power device temperature, power consumption summation is looked into the power device unit interval
Temperature rise table obtains rational power device temperature rise in the unit interval and is compared, if be calculated in real time actual in the unit interval
Power device temperature rise it is too fast, then illustrate coolant rate deficiency.After the failure of coolant rate deficiency is diagnosed to be, then to electricity
The output torque of electrical automobile motor is limited, so as to achieve the purpose that limiting motor driver output power, motor driver
Power device temperature be not up to upper limit value.Examined using the electric automobile cooling system coolant rate deficiency failure of the present invention
Disconnected method, can be not equipped with current coolant rate being diagnosed by software whether in the case of flow sensor on vehicle
Deficiency, the hardware cost reduced, and can be right in the case where the power device temperature of motor driver is not reaching to upper limit value
Motor output torque is limited, and carries out overheat protector to motor driver in advance.
Embodiment two
Electric automobile cooling system coolant rate deficiency method for diagnosing faults based on embodiment one, the temperature rise table
Scaling method is：
Keep the coolant temperature of electric automobile cooling system, the power device temperature of motor in electric automobile driver not
Become, change the power consumption of the power device of motor in electric automobile driver by varying the output torque of motor in electric automobile, survey
Power consumption summation in the power device unit interval of amount motor in electric automobile driver reaches N number of different expection power consumption number and divides
Power device temperature rise in the not corresponding unit interval, record data to the relevant position of the temperature rise table of N*N*N；
Keep coolant temperature, the output torque of motor in electric automobile of electric automobile cooling system constant, by varying
The power device temperature of motor in electric automobile driver, in the power device unit interval for measuring motor in electric automobile driver
Power consumption summation reach N number of different expection power consumption number power device temperature rise in the corresponding unit interval, record data
To the relevant position of the temperature rise table of N*N*N；
Keep power device temperature, the output torque of motor in electric automobile of motor in electric automobile driver constant, pass through
Change the coolant temperature of electric automobile cooling system, in the power device unit interval for measuring motor in electric automobile driver
Power consumption summation reach N number of different expection power consumption number power device temperature rise in the corresponding unit interval, record data
To the relevant position of the temperature rise table of N*N*N.
Preferably, N is 5.
The temperature of coolant, can be by cooling fluid supply default static temperature；The temperature of power device, can pass through
Power device environment temperature is set to set static temperature；The power consumption of power device turns with busbar voltage, output current and motor
Speed has relation, and real-time power device power consumption can be shown that the unit interval power consumption of internal power device is total by these three parameters
With can be calculated by the method for integration.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of protection of the invention.
Claims (5)
1. a kind of electric automobile cooling system coolant rate deficiency method for diagnosing faults, it is characterised in that comprise the following steps：
One, demarcates a temperature rise table, including power device temperature rise, coolant temperature, power device temperature, power device unit interval
Interior four parameters of power consumption summation；Each power device temperature rise, corresponding to a coolant temperature, a power device temperature and a power
Power consumption summation in the device unit interval；
Two, detect the coolant temperature of electric automobile cooling system, the power device temperature of motor in electric automobile driver in real time,
And power consumption summation in the power device unit interval of calculating motor in electric automobile driver in real time；
Coolant temperature that three, are obtained according to step 2, power device temperature, power consumption summation in the power device unit interval, lead to
Cross and look into the temperature rise table, obtain rational power device temperature rise in the unit interval；
The power device temperature of the motor in electric automobile driver detected in real time according to step 2, is calculated the unit interval in real time
Interior actual power device temperature rise；
If actual power device temperature rise subtracts the difference of rational power device temperature rise in the unit interval in four, unit interval
Up to setting value, then electric automobile cooling system coolant rate deficiency fault message is exported.
2. electric automobile cooling system coolant rate deficiency method for diagnosing faults according to claim 1, its feature exist
In,
In step 3, the corresponding power device temperature rise temperature rise table will be looked into obtaining, then when carrying out linearization process and obtaining unit
Interior rational power device temperature rise.
3. electric automobile cooling system coolant rate deficiency method for diagnosing faults according to claim 1, its feature exist
In,
The scaling method of the temperature rise table is：
Keep coolant temperature, the power device of motor in electric automobile driver of electric automobile cooling system temperature-resistant, lead to
Cross and change the output torque of motor in electric automobile to change the power consumption of the power device of motor in electric automobile driver, measurement is electronic
Power consumption summation in the power device unit interval of electric motor of automobile driver reaches N number of different expection power consumption number and corresponds to respectively
Unit interval in power device temperature rise, record data are to the relevant position of the temperature rise table of N*N*N；
Keep coolant temperature, the output torque of motor in electric automobile of electric automobile cooling system constant, by varying electronic
The power device temperature of electric motor of automobile driver, measures the power consumption in the power device unit interval of motor in electric automobile driver
Summation reach N number of different expection power consumption number power device temperature rise in the corresponding unit interval, record data to N*
The relevant position of the temperature rise table of N*N；
Keep power device temperature, the output torque of motor in electric automobile of motor in electric automobile driver constant, by varying
The coolant temperature of electric automobile cooling system, measures the power consumption in the power device unit interval of motor in electric automobile driver
Summation reach N number of different expection power consumption number power device temperature rise in the corresponding unit interval, record data to N*
The relevant position of the temperature rise table of N*N.
4. electric automobile cooling system coolant rate deficiency method for diagnosing faults according to claim 3, its feature exist
In,
N is 5.
5. according to claim 1 to 4 any one of them electric automobile cooling system coolant rate deficiency method for diagnosing faults,
It is characterized in that,
If step 4 exports electric automobile cooling system coolant rate deficiency fault message, to the defeated of motor in electric automobile
Go out moment of torsion to be limited.
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| CN107196585B (en) * | 2017-06-11 | 2019-04-19 | 天津恒天新能源汽车研究院有限公司 | A method of inhibiting electric car synchronous motor controller overheat |
| CN108548570B (en) * | 2018-05-10 | 2021-03-19 | 蔚来(安徽)控股有限公司 | Coolant flow estimation method, coolant temperature estimation device, coolant temperature estimation system and vehicle |
| CN109540538B (en) * | 2018-08-27 | 2021-06-18 | 浙江中车电车有限公司 | Failure analysis method for passenger car cooling system |
| EP3672007A1 (en) * | 2018-12-17 | 2020-06-24 | Siemens Aktiengesellschaft | Determination of the flow speed in a coolant circuit |
| CN110614919B (en) * | 2019-09-23 | 2023-04-28 | 联合汽车电子有限公司 | Cooling liquid flow monitoring method and liquid cooling electric drive system |
| CN112484807A (en) * | 2020-12-01 | 2021-03-12 | 潍柴动力股份有限公司 | Liquid level detection method, device, equipment and computer readable storage medium |
| CN116095801B (en) * | 2023-04-13 | 2023-06-30 | 中国电信股份有限公司浙江分公司 | High-reliability energy-saving method and device for base station equipment |
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