JP6958458B2 - Electric car - Google Patents

Description

The present invention relates to an electric vehicle, and more particularly to an electric vehicle having a plurality of temperature sensors in a heat release part of an air conditioner, a storage part for accommodating a motor, and the like, and performing an abnormality diagnosis of the temperature sensor when the system is started.

Conventionally, as this kind of technology, two cooling water temperature sensors for detecting the temperature of the cooling water of the engine are provided, the estimated temperature which is an estimated value of the cooling water temperature is calculated, and the detection of the two cooling water temperature sensors is performed. It has been proposed to determine the presence or absence of abnormality in two cooling water temperature sensors based on a value and an estimated temperature (see, for example, Patent Document 1). In this technology, the estimated temperature at a certain point in time is set as the reference temperature, the estimated temperature has changed from the reference temperature by the judgment temperature as the judgment permission condition, and the two cooling water temperature sensors at the time when the judgment permission condition is satisfied When the deviation of the detected values is less than the normal temperature below the judgment temperature, it is determined that the two cooling water temperature sensors are normal.

Japanese Unexamined Patent Publication No. 2017-141763

In an electric vehicle, an air conditioner that harmonizes the air in the passenger compartment is generally driven by electric power from an on-board battery. Therefore, the air conditioner can be driven to harmonize the passenger compartment with air while the system is stopped by using a timer or the like. The heat release part and the compressor due to the heat exchange of the air conditioner are housed in the space in front of or behind the vehicle together with the motor and the like. A plurality of temperature sensors are attached to such a storage space, and an abnormality diagnosis is performed on these temperature sensors at the time of system startup or the like. In the abnormality diagnosis, the temperatures detected by a plurality of temperature sensors are usually compared, and when there is no discrepancy, it is determined to be normal. However, when the air conditioner is driven while the system is stopped, the temperature in the storage space becomes high due to the heat from the heat release part of the air conditioner and the heat of the compressor. At this time, since the temperature rise differs depending on each location of the storage space, an abnormality is detected when an abnormality diagnosis of the temperature sensor is performed at the time of system startup.

The main object of the electric vehicle of the present invention is to more appropriately perform an abnormality diagnosis on a plurality of temperature sensors attached to a storage space even when the air conditioner is driven while the system is stopped.

The electric vehicle of the present invention has adopted the following means in order to achieve the above-mentioned main object.

The electric vehicle of the present invention
With a driving motor
A power storage device that supplies electric power to the motor,
An air conditioner that uses electric power from the power storage device to harmonize the air in the passenger compartment,
At least a plurality of temperature sensors attached to a storage unit for accommodating the heat release unit of the air conditioner and the motor, and
A control device that diagnoses an abnormality of each temperature sensor by comparing the respective temperatures detected by the plurality of temperature sensors, and
It is an electric car equipped with
When the control device performs the abnormality diagnosis when the system is started after driving the air conditioner while the system is stopped, the temperature rise based on the operating amount of the air conditioner is estimated for each of the plurality of temperature sensors. Then, the abnormality diagnosis is performed using the temperature corrected by the estimated rise temperature with respect to the temperature detected by each of the plurality of temperature sensors.
It is characterized by that.

In the electric vehicle of the present invention, an abnormality of each temperature sensor is usually performed by comparing the respective temperatures detected by a plurality of temperature sensors attached to the heat release part of the air conditioner and the storage part accommodating the motor. Make a diagnosis. When performing an abnormality diagnosis at the time of system startup after driving the air conditioner with the system stopped, the temperature rise based on the operating amount of the air conditioner is estimated for each of the multiple temperature sensors, and each of the multiple temperature sensors is used. Abnormality diagnosis of each temperature sensor is performed by comparing the detected temperature with the temperature corrected by the estimated rising temperature. As a result, even when the air conditioner is driven while the system is stopped, it is possible to more appropriately diagnose an abnormality with a plurality of temperature sensors attached to the storage space.

It is a block diagram which shows the outline of the structure of the electric vehicle 20 as an Example of this invention. It is a flowchart which shows an example of the abnormality diagnosis processing routine executed by the electronic control unit 50. It is explanatory drawing which shows an example of the map for setting a rise temperature. It is explanatory drawing which shows an example of the time change of the temperature Ta, Tb detected by the temperature sensor 72a, 72b.

Next, a mode for carrying out the present invention will be described with reference to examples.

FIG. 1 is a configuration diagram showing an outline of the configuration of an electric vehicle 20 as an embodiment of the present invention. As shown in the figure, the electric vehicle 20 of the embodiment includes a motor 32, an inverter 34, a battery 36 as a power storage device, a charger 40, an air conditioner compressor 44a, an air conditioner heat release unit 44b, and electronic control. It includes a unit 50 and.

The motor 32 is configured as, for example, a synchronous motor generator, and the rotor is connected to a drive shaft 26 connected to the drive wheels 22a and 22b via a differential gear 24. The inverter 34 is used to drive the motor 32 and is connected to the battery 36 via the power line 38. The motor 32 is rotationally driven by switching control of a plurality of switching elements (not shown) of the inverter 34 by the electronic control unit 50. The battery 36 is configured as, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery.

The charger 40 is connected to the power line 38, and the vehicle-side connector 42 is connected to the equipment-side connector 92 from an external power source 91 such as a household power supply or an industrial power supply in the charging equipment 90 at home or a charging station. The battery 36 can be charged by using the electric power from the external power source 91. The charger 40 is controlled by the electronic control unit 50.

The air conditioner is an air conditioner (air conditioner) that harmonizes the air in the passenger compartment, and includes an air conditioner compressor 44a and a heat radiating unit 44b such as a heat exchanger. The air conditioner compressor 44a is driven by the electric power from the battery 36. The air conditioner compressor 44a and the heat radiating unit 44b are housed in the storage space 70 in front of the vehicle together with the motor 32.

Although not shown, the electronic control unit 50 is configured as a microprocessor centered on a CPU, and in addition to the CPU, a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and communication. It has a port.

Signals from various sensors are input to the electronic control unit 50 via input ports. The signals input to the electronic control unit 50 include, for example, the rotation position θm of the rotor of the motor 32 from a rotation position sensor (not shown) that detects the rotation position of the rotor of the motor 32, and the phase of each phase of the motor 32. Phase currents Iu, Iv, Iw of each phase of the motor 32 from a current sensor (not shown) that detects the current can be mentioned. Further, the voltage Vb of the battery 36 from the voltage sensor 36a attached between the terminals of the battery 36, the current Ib of the battery 36 from the current sensor 36b attached to the output terminal of the battery 36, and the temperature attached to the battery 36. The temperature Tb of the battery 36 from the sensor 36c can also be mentioned. A connection detection signal from the connection detection sensor 43, which is attached to the vehicle-side connector 42 and detects the connection between the vehicle-side connector 42 and the equipment-side connector 92, can also be mentioned. The ignition signal from the ignition switch 60 and the shift position SP from the shift position sensor 62 that detects the operation position of the shift lever 61 can also be mentioned. Accelerator opening Acc from the accelerator pedal position sensor 64 that detects the amount of depression of the accelerator pedal 63, brake pedal position BP from the brake pedal position sensor 66 that detects the amount of depression of the brake pedal 65, and vehicle speed V from the vehicle speed sensor 68. And so on. Further, the temperatures Ta and Tb from the plurality of temperature sensors 72a and 72b attached to the storage space 70 can also be mentioned.

Various control signals are output from the electronic control unit 50 via the output port. Examples of the signal output from the electronic control unit 50 include a control signal to the inverter 34, a control signal to the charger 40, and a drive control signal to the air conditioner compressor 44a.

The operation of the electric vehicle 20 of the embodiment configured in this manner, particularly the operation of the plurality of temperature sensors 72a and 72b attached to the storage space 70 at the time of abnormality diagnosis will be described. FIG. 2 is a flowchart showing an example of an abnormality diagnosis processing routine executed by the electronic control unit 50. This routine is executed when the system boots.

When the abnormality diagnosis processing routine is executed, the electronic control unit 50 first determines whether or not the system has been stopped for a long time (step S100). Here, the long time is longer than the time for repeatedly executing the abnormality diagnosis of the temperature sensors 72a and 72b, and for example, 8 hours or 10 hours can be considered. When it is determined that the system has not been stopped for a long time, it is determined that it is not necessary to perform an abnormality diagnosis, and this routine is terminated.

When it is determined in step S100 that the system has been stopped for a long time, it is determined whether or not the air conditioner has been driven while the system is stopped (step S110). When the air conditioner is not driven while the system is stopped, an abnormality diagnosis is performed using the temperatures Ta and Tb detected by the temperature sensors 72a and 72b (step S120), and this routine is terminated. The abnormality diagnosis can be performed, for example, by diagnosing normal when the difference ΔT of the temperatures Ta and Tb detected by the temperature sensors 72a and 72b is less than the threshold value, and diagnosing abnormality when the difference ΔT is equal to or more than the threshold value.

When it is determined in step S110 that the air conditioner has been driven while the system is stopped, the temperature rise (rise temperature) from the temperature originally detected by the temperature sensors 72a and 72b is calculated based on the operating amount (power consumption and drive time) of the air conditioner. Estimate (step S130). As for the rising temperature, in the embodiment, the relationship between the power consumption by the air conditioner, the driving time, and the rising temperature is determined in advance by experiments or the like for each temperature sensor and stored as a map for setting the rising temperature, and the power consumption and driving by the air conditioner are stored. Given the time, it was estimated by deriving the corresponding temperature rise from the map. FIG. 3 shows an example of a map for setting the rising temperature. As shown in the figure, the rising temperature is estimated to be higher as the power consumption is larger and higher as the driving time is longer. Then, the temperature for abnormality diagnosis is calculated by subtracting the rising temperature from the temperatures Ta and Tb from the temperature sensors 72a and 72b (step S140), and the abnormality diagnosis is performed using the temperature for abnormality diagnosis (step S150). End this routine.

FIG. 4 is an explanatory diagram showing an example of the time change of the temperatures Ta and Tb detected by the temperature sensors 72a and 72b. In the figure, the alternate long and short dash line is the temperature Ta detected by the temperature sensor 72a, the solid line is the temperature Tb detected by the temperature sensor 72b, and the alternate long and short dash line indicates the temperature for determining abnormality of the temperature sensor 72a. When the system is stopped at time T1, the temperatures Ta and Tb gradually decrease and approach the outside air temperature. When the air conditioner is driven at the time T2, the temperature Ta of the temperature sensor 72a in the vicinity of the air conditioner compressor 44a and the heat radiating unit 44b becomes high, but the temperature Tb of the temperature sensor 72b away from these maintains the vicinity of the outside air temperature. When the system is started at time T3 and the abnormality diagnosis processing routine is executed, the temperature rise of the temperature sensor 72a is estimated, and the temperature rise is subtracted from the temperature Ta detected by the temperature sensor 72a to determine the temperature for abnormality diagnosis (in FIG. 4). Two-dot chain line) is calculated. The abnormality diagnosis is performed by comparing the temperature for abnormality diagnosis of the temperature sensor 72a with the temperature Tb (or the temperature for abnormality diagnosis) of the temperature sensor 72b.

In the electric vehicle 20 of the above-described embodiment, when an abnormality diagnosis is performed when the system is started after the air conditioner is driven while the system is stopped, the temperature sensors 72a and 72b are used based on the operating amount (power consumption and driving time) of the air conditioner. The temperature rise (rise temperature) is estimated from the originally detected temperature, the temperature rise is subtracted from the temperatures Ta and Tb from the temperature sensors 72a and 72b to calculate the temperature for abnormality diagnosis, and the temperature for abnormality diagnosis is used to calculate the abnormality. Make a diagnosis. As a result, even when the air conditioner (air conditioner) is driven while the system is stopped, the abnormality diagnosis can be performed more appropriately on the plurality of temperature sensors 72a and 72b attached to the storage space 70.

The electric vehicle 20 of the embodiment includes a charger 40 that charges the battery 36 by using the electric power from the external power source 91 when the vehicle side connector 42 and the equipment side connector 92 are connected. In addition to or in place of the charger 40, a charger may be provided that receives power from an external power source in a non-contact manner to charge the battery 36.

In the electric vehicle 20 of the embodiment, the battery 36 is used as the power storage device, but a capacitor may be used instead of the battery 36.

In the examples, the present invention has been described as being applied to the electric vehicle 20, but it may be applied to a hybrid vehicle equipped with an engine.

The correspondence between the main elements of the examples and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the motor 32 corresponds to the "motor", the battery 36 corresponds to the "storage device", the air conditioner compressor 44a, and the air conditioner having the heat release unit 44b correspond to the "air conditioner", and the storage space. 70 corresponds to the “storage unit”, the temperature sensors 72a and 72b correspond to the “plurality of temperature sensors”, and the electronic control unit 50 corresponds to the “control device”.

Regarding the correspondence between the main elements of the examples and the main elements of the invention described in the column of means for solving the problem, the invention described in the column of means for solving the problem in the examples is carried out. Since it is an example for specifically explaining the form for solving the problem, the elements of the invention described in the column of means for solving the problem are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be performed based on the description in the column, and the examples are the inventions described in the column of means for solving the problem. It is just a concrete example.

Although the embodiments for carrying out the present invention have been described above with reference to examples, the present invention is not limited to these examples, and various embodiments are used without departing from the gist of the present invention. Of course, it can be done.

The present invention can be used in the manufacturing industry of electric vehicles and the like.

20 electric vehicle, 22a, 22b drive wheel, 24 differential gear, 26 drive shaft, 32 motor, 34 inverter, 36 battery, 36a voltage sensor, 36b current sensor, 36c temperature sensor, 38 power line, 40 charger, 42 vehicle side Connector, 43 connection detection sensor, 44a air conditioner compressor, 44b heat release unit, 50 electronic control unit, 60 ignition switch, 61 shift lever, 62 shift position sensor, 63 accelerator pedal, 64 accelerator pedal position sensor, 65 brake pedal, 66 Brake pedal position sensor, 68 vehicle speed sensor, 70 storage space, 72a, 72b temperature sensor, 90 charging equipment, 91 external power supply, 92 equipment side connector.

Claims (1)

With a driving motor
A power storage device that supplies electric power to the motor,
An air conditioner that uses electric power from the power storage device to harmonize the air in the passenger compartment,
At least a plurality of temperature sensors attached to a storage unit for accommodating the heat release unit of the air conditioner and the motor, and
A control device that diagnoses an abnormality of each temperature sensor by comparing the respective temperatures detected by the plurality of temperature sensors, and
It is an electric car equipped with
When the control device performs the abnormality diagnosis when the system is started after driving the air conditioner while the system is stopped, the temperature rise based on the operating amount of the air conditioner is estimated for each of the plurality of temperature sensors. Then, the abnormality diagnosis is performed using the temperature corrected by the estimated rise temperature with respect to the temperature detected by each of the plurality of temperature sensors.
An electric vehicle characterized by that.

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