Control device of vehicle

Abstract

To provide a control device of a vehicle which is capable of charging a battery while restraining precision of abnormality diagnosis of the control device from being deteriorated.SOLUTION: In a control device of a vehicle which is installed on the vehicle including an engine and a battery and controls charging of the battery, it comprises an internal temperature acquisition part which acquires internal temperature of the control device, an intake temperature acquisition part which acquires intake temperature of the engine, a diagnosis part which executes abnormal diagnostic process of the control device on the basis of the internal temperature and the intake temperature by switching the control device from off-state to on-state in condition of ignition-on and a charging part which executes charge processing of the battery by switching the control device from off-state to on-state in condition of ignition-off. The charging part interrupts the charge processing by turning off the control device if the internal temperature becomes threshold value or more during the charge processing and before the execution of diagnostic process. The diagnosis part executes the diagnostic process after interruption of the charge processing. The charging part resumes the charge processing after execution of the diagnostic process if the charge processing is interrupted.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a vehicle control device. [Background technology]

[0002] There is a technique for executing a predetermined control based on the internal temperature of a control device of a vehicle having an engine (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2011 / 117969 Summary of the Invention [Problem to be solved by the invention]

[0004] It is conceivable to execute a diagnosis process for an abnormality in the control device based on the internal temperature of the control device and the intake air temperature of the engine. The control device may also control charging of a battery mounted on a vehicle. When the battery is being charged, the internal temperature of the control device rises. If the diagnosis process is executed in such a state where the internal temperature of the control device is high, there is a risk that the accuracy of the abnormality diagnosis will decrease.

[0005] SUMMARY OF THE PRESENT DISCLOSURE In view of the above, an object of the present invention is to provide a vehicle control device that is capable of charging a battery while suppressing a decrease in the accuracy of abnormality diagnosis of the control device. [Means for solving the problem]

[0006] The above object can be achieved by a vehicle control device that is mounted on a vehicle having an engine and a battery and controls charging of the battery, comprising an internal temperature acquisition unit that acquires an internal temperature of the control device, an intake temperature acquisition unit that acquires an intake temperature of the engine, a diagnosis unit that switches the control device from off to on when the ignition is off and performs a diagnosis process for an abnormality of the control device based on the internal temperature and the intake air temperature, and a charging unit that switches the control device from off to on when the ignition is off and performs a charging process for the battery, wherein when the internal temperature becomes equal to or higher than a threshold value during the charging process and before the diagnostic process is performed, the charging unit turns off the control device and interrupts the charging process, the diagnostic unit performs the diagnostic process after the charging process is interrupted, and when the charging process is interrupted, the charging unit resumes the charging process after the diagnostic process is performed.

[0007] After the diagnosis process is completed, the charging unit may resume the charging process regardless of a diagnosis result of the diagnosis process.

[0008] The charging unit may resume the charging process when a diagnosis result of the diagnostic process is normal, and may not resume the charging process when a diagnosis result of the diagnostic process is abnormal.

[0009] The vehicle may have a motor which is a driving power source, a motor control device which controls the motor, and a battery control device which controls the battery, and the control device may control the engine and the motor control device, and perform the charging process by controlling the battery control device. Effect of the Invention

[0010] According to the present invention, it is possible to provide a vehicle control device that is capable of charging a battery while suppressing a decrease in accuracy of abnormality diagnosis of the control device. [Brief description of the drawings]

[0011] [Figure 1]FIG. 1 is a schematic diagram of a hybrid vehicle. [Diagram 2] 4 is a flowchart illustrating a charging control. [Diagram 3] 4 is a flowchart illustrating a diagnostic charging resumption control. [Figure 4] 4 is a timing chart illustrating charging control and diagnostic charging resumption control. [Diagram 5] 13 is a flowchart of a modified example of diagnostic charging resumption control. [Figure 6] 13 is a timing chart of a modified example of charging control and diagnostic charging resumption control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [General configuration of hybrid vehicle] 1 is a schematic diagram of a hybrid vehicle 1. The hybrid vehicle 1 is a plug-in hybrid vehicle that can charge a battery 40 from an external power source (hereinafter referred to as external charging). The hybrid vehicle 1 includes an engine 10, a motor 20, drive wheels 30, a battery 40, a DCDC converter 45, an auxiliary battery 50, an auxiliary device 55, a charger 60, and a plug 65. The engine 10 and the motor 20 function as a driving power source. Driving force generated by the engine 10 and the motor 20 is transmitted to the drive wheels 30, and the hybrid vehicle 1 runs. The engine 10 is a gasoline engine, but may be a diesel engine.

[0013] The motor 20 is driven by power supplied from the battery 40. The motor 20 generates driving force for the vehicle in response to the power supply from the battery 40. The motor 20 generates electricity using power from the engine 10 and the drive wheels 30. The electricity generated by the motor 20 is charged into the battery 40. As described above, the battery 40 can be charged externally via the charger 60 and the plug 65.

[0014] The auxiliary battery 50 has a lower voltage than the battery 40. The auxiliary battery 50 supplies power to the auxiliary device 55. The auxiliary battery 50 is connected to the battery 40 via a DCDC converter 45. By controlling the DCDC converter 45, the auxiliary battery 50 can be charged (hereinafter referred to as pumping charging) by the power of the battery 40. The auxiliary device 55 is, for example, an air conditioner device or a power steering device mounted on the hybrid vehicle 1.

[0015] The hybrid vehicle 1 is equipped with an integrated ECU (Electronic Control Unit) 70, a motor ECU 72, a battery ECU 74, and a power supply ECU 76. The motor ECU 72 controls the operation of the motor 20. The battery ECU 74 controls the charging and discharging of the battery 40 and the DCDC converter 45. The power supply ECU 76 controls the charger 60. The integrated ECU 70 controls the operation of the engine 10 and also controls the motor ECU 72, the battery ECU 74, and the power supply ECU 76. These ECUs are electronic control units that include a calculation processing circuit that performs various calculation processes and a memory that stores control programs and data. The integrated ECU 70 is an example of a control device for the hybrid vehicle 1. The integrated ECU 70 functionally realizes an internal temperature acquisition unit, an intake temperature acquisition unit, a diagnosis unit, and a charging unit, which will be described later.

[0016] The sensor group S3 is connected to the integrated ECU 70. The sensor group S3 includes, for example, a vehicle speed sensor, an accelerator opening sensor, a brake opening sensor, a motor rotation speed sensor, a crank angle sensor, a shift position sensor, a coolant temperature sensor, and a SOC (State Of Charge) sensor.

[0017] The integrated ECU 70 controls the operation of the engine 10 based on the detection values ​​of the above sensors. That is, the integrated ECU 70 has the function of an engine ECU. The integrated ECU 70 also outputs an operation command for the motor 20 to the motor ECU 72 based on the detection values ​​of these sensors. The motor ECU 72 controls the operation of the motor 20 according to the operation command from the integrated ECU 70. The motor ECU 72 is an example of a motor control device. The integrated ECU 70 also outputs an operation command for the battery 40 and the auxiliary battery 50 to the battery ECU 74 based on the detection values ​​of these sensors. The battery ECU 74 controls the battery 40 and the auxiliary battery 50 according to the operation command from the integrated ECU 70.

[0018] As described above, the integrated ECU 70 has the function of the engine ECU and the function of controlling the motor ECU 72 and the battery ECU 74. For example, compared to a case where an engine ECU, a motor ECU 72, a battery ECU 74, and an ECU that performs integrated control of these are provided separately, the integrated ECU 70 of this embodiment has the function of the engine ECU, so that the number of ECUs can be reduced, thereby reducing costs.

[0019] The ignition switch S1 is connected to the power supply ECU 76. When the ignition switch S1 is switched from off to on, the power supply ECU 76 outputs an ignition signal to the integrated ECU 70. This turns the integrated ECU 70 on. The integrated ECU 70 turns on the motor ECU 72 and the battery ECU 74. In the ignition on state, the integrated ECU 70 controls the driving of the engine 10 and also controls the motor ECU 72 and the battery ECU 74. When the ignition switch S1 is switched from on to off, the power supply ECU 76 issues a command to the integrated ECU 70, and the integrated ECU 70 turns off the motor ECU 72 and the battery ECU 74 and also turns off the integrated ECU 70 itself.

[0020] The intake air temperature sensor S2 detects the temperature of the intake air introduced into the engine 10. The intake air temperature sensor S2 is connected to the integrated ECU 70. The integrated ECU 70 obtains the temperature of the intake air based on the detection value of the intake air temperature sensor S2.

[0021] The internal temperature sensor S7 detects the internal temperature of the integrated ECU 70. The internal temperature sensor S7 is connected to the integrated ECU 70. The integrated ECU 70 acquires the internal temperature of the integrated ECU 70 based on the detection value of the internal temperature sensor S7. The integrated ECU 70 includes a housing and a circuit board housed in the housing. The internal temperature sensor S7 is disposed in the housing and electrically connected to the circuit board.

[0022] The integrated ECU 70 includes a soak timer T7. The soak timer T7 includes a counter for measuring the elapsed time after the ignition is turned off. The soak timer T7 is driven by a backup power supply provided in the integrated ECU 70. Therefore, the soak timer T7 measures the elapsed time even when the integrated ECU 70 is turned off.

[0023] When the plug 65 is connected to an external power source with the ignition off, the power supply ECU 76 turns on the integrated ECU 70, and the integrated ECU 70 turns on the battery ECU 74. The integrated ECU 70 issues a command to the battery ECU 74 to execute a charging process for externally charging the battery 40. When a predetermined time has elapsed with the ignition off, the power supply ECU 76 turns on the integrated ECU 70, and the integrated ECU 70 turns on the battery ECU 74. In this case, the integrated ECU 70 issues a command to the battery ECU 74 to control the DCDC converter 45, and executes a charging process for pumping and charging the auxiliary battery 50. In this way, the integrated ECU 70 controls the charging of the battery 40 and the auxiliary battery 50.

[0024] When a predetermined time has elapsed with the ignition off, the integrated ECU 70 is switched from off to on, and a diagnosis process for an abnormality of the integrated ECU 70 is executed. The diagnosis process is executed based on the detection value of the internal temperature sensor S7 by turning on the integrated ECU 70 with the ignition off. In detail, when the difference between the intake temperature and the internal temperature of the integrated ECU 70 is less than a predetermined temperature based on the detection values ​​of the intake temperature sensor S2 and the internal temperature sensor S7, the integrated ECU 70 is provisionally diagnosed as normal. When the difference is equal to or greater than the predetermined temperature, the integrated ECU 70 is provisionally diagnosed as abnormal. The diagnosis process is executed three times with a predetermined time interval in the ignition off state. In the provisional diagnosis, the integrated ECU 70 is switched from off to on. Therefore, the integrated ECU 70 is switched from off to on three times with the ignition off. For example, when the integrated ECU 70 is provisionally diagnosed as normal three times, the integrated ECU 70 is finally diagnosed as normal. When the integrated ECU 70 is provisionally diagnosed as abnormal three times in succession, the integrated ECU 70 is finally diagnosed as abnormal. If at least one of the three tests results in a provisional diagnosis of an abnormality, the actual diagnosis is not performed. The execution times (hereinafter referred to as diagnosis times) of the three provisional diagnoses performed after the ignition is turned off are preset. The diagnosis process is an example of a process executed by the diagnosis unit.

[0025] [Charging control, diagnostic charging restart control] Fig. 2 is a flowchart illustrating the charging control. Fig. 3 is a flowchart illustrating the diagnostic charging restart control. Fig. 4 is a timing chart illustrating the charging control and the diagnostic charging restart control. Fig. 4 shows the presence or absence of a charging request, the on / off state of the integrated ECU 70, the coolant temperature, the internal temperature of the integrated ECU 70, and the changes in the intake air temperature. The coolant temperature is the temperature of the coolant for the engine 10.

[0026] First, the charging control will be described with reference to Figures 2 and 4. The power supply ECU 76 determines whether the ignition is off (step S1). If the result in step S1 is No, the charging control ends.

[0027] If the answer is Yes in step S1 (time t1), the coolant temperature starts to drop. The intake air temperature rises once when the engine 10 is stopped and then starts to drop. The integrated ECU 70 is de-energized when the ignition is turned off. Therefore, the internal temperature of the integrated ECU 70 also starts to drop. If the answer is Yes in step S1, the integrated ECU 70 determines whether or not there is a charging request (step S2). If the answer is No in step S2, charging control ends.

[0028] If the answer is Yes in step S2 (time t2), the integrated ECU 70 switches from OFF to ON (step S3), and the integrated ECU 70 executes a charging process (step S4). The internal temperature of the integrated ECU 70 increases as a result of the charging process. Note that the coolant temperature and the intake air temperature decrease even during the charging process.

[0029] The integrated ECU 70 determines whether the internal temperature of the integrated ECU 70 is equal to or higher than a threshold value based on the detection value of the internal temperature sensor S7 (step S5). The threshold value is set to a normal value for the internal temperature of the integrated ECU 70 that rises during the execution of the charging process. Step S5 is an example of a process executed by the internal temperature acquisition unit and the charging unit. If the result of step S5 is No, the integrated ECU 70 determines whether the charging process is completed (step S6). If the result of step S6 is No, step S4 is executed again. If the result of step S6 is Yes, the integrated ECU 70 is turned off (step S9).

[0030] If the answer is Yes in step S5 (time t3), the integrated ECU 70 interrupts the charging process (step S7), reserves the time to resume the charging process (step S8), and turns off (step S9). The restart time is set to a time a predetermined time after the time the diagnostic process ends. In other words, the charging process is resumed after the diagnostic process is executed. When the charging process is interrupted, the integrated ECU 70 stores the interruption history in memory. When the integrated ECU 70 is turned off, the internal temperature of the integrated ECU 70 drops. Steps S7 and S8 are an example of processing executed by the charging unit.

[0031] Next, the diagnostic charging restart control will be described with reference to FIG. 3 and FIG. 4. The power supply ECU 76 judges whether the ignition is off (step S11). If the result in step S11 is No, the diagnostic control ends. If the result in step S11 is Yes, the soak timer T7 judges whether the measured time is the diagnosis time (step S12). If the result in step S12 is Yes (time t4), the integrated ECU 70 turns on (step S13), and the integrated ECU 70 executes the diagnostic process based on the detection values ​​of the intake air temperature sensor S2 and the internal temperature sensor S7 (step S14). As described above, since the charging process is interrupted before the execution of the diagnostic process (time t3), the internal temperature of the integrated ECU 70 has decreased when the diagnostic process is executed (time t4). Therefore, the deterioration of the accuracy of the abnormality diagnosis of the integrated ECU 70 is suppressed. Step S14 is an example of the process executed by the intake air temperature acquisition unit and the diagnosis unit.

[0032] Thereafter, the integrated ECU 70 is switched off (step S15). After step S15, or if step S12 is No, the soak timer T7 determines whether the measured time is the time to resume the charging process (step S16). If step S16 is No, this diagnostic control ends. When this diagnostic control is started again and step S11 is Yes and it is time to diagnose again (time t5, step S12 is Yes), the integrated ECU 70 is turned on again, the diagnostic process is executed, and then the integrated ECU 70 is turned off (steps S13, S14, S15). The same is true at time t6.

[0033] When the restart time arrives (time t7, Yes in step S16), the integrated ECU 70 turns on (step S17) and determines whether there is a history of interruption of the charging process (step S18). If Yes in step S18, the integrated ECU 70 resumes the charging process (step S19) and determines whether the charging process has been completed (step S20). If No in step S20, the processing of step S19 is executed again. If No in step S18 or Yes in step S20, the integrated ECU 70 turns off (step S21). Step S19 is an example of processing executed by the charging unit. It should be noted that if Yes in step S20, the integrated ECU 70 deletes the interruption history from the memory.

[0034] As described above, the charging process is interrupted before the execution of the diagnostic process, and the diagnostic process is executed after that. Therefore, the influence of the internal temperature of the integrated ECU 70 during the execution of the charging process can be suppressed, and the abnormality diagnosis of the integrated ECU 70 can be executed with high accuracy. Moreover, the charging process is resumed after the end of the diagnostic process regardless of the diagnosis result. Therefore, the effectiveness of charging can be ensured.

[0035] [Variations] Next, a modified example of the above-mentioned control will be described. FIG. 5 is a flowchart of a modified example of the diagnostic charging restart control. FIG. 6 is a timing chart of a modified example of the charging control and the diagnostic charging restart control. FIG. 6 corresponds to FIG. 4. Note that in the charging control of this modified example, the reservation of the restart time of the charging process shown in FIG. 2 (step S8) is not executed. Other than this point, the charging control of this modified example is the same as the charging control shown in FIG. 2. Therefore, also in this modified example, the charging process is interrupted before the execution of the diagnostic process, and the diagnostic process is executed thereafter. The diagnostic charging restart control of this modified example will be described in detail below.

[0036] If the answer is No in step S11 or S12, this control ends. If the answer is Yes in steps S11 and S12 and steps S13 and S14 are executed (time t4), the integrated ECU 70 judges whether the result of the provisional diagnosis is normal (step S15a). If the answer is Yes in step S15a, the integrated ECU 70 judges whether there is an interruption history (step S16a). If the answer is No in step S15a or S16a, the integrated ECU 70 is turned off (step S23a).

[0037] If the results of steps S15a and S16a are Yes, the charging process is resumed (step S17a). That is, if the result of the provisional diagnosis is normal, the charging process is resumed without switching off the integrated ECU 70. Step S17a is an example of a process executed by the charging unit.

[0038] Next, the integrated ECU 70 judges whether or not the diagnosis time has come during the execution of the charging process (step S18a). If the answer is Yes in step S18a (time t5), the integrated ECU 70 executes the diagnosis process (step S19a). Next, the integrated ECU 70 judges whether or not the result of the provisional diagnosis is abnormal (step S20a). If the answer is No in step S18a or S20a, the integrated ECU 70 judges whether or not the charging process has been completed (step S21a). If the answer is No in step S21a, step S17a is executed again. That is, as long as the result of the provisional diagnosis is normal, the charging process is continued (time t6). If the answer is Yes in step S21a, the integrated ECU 70 is turned off (step S23a).

[0039] If the result of step S20a is Yes, the integrated ECU 70 suspends the charging process (step S22a), and the integrated ECU 70 is turned off (step S23a). That is, if the provisional diagnosis result is an abnormality, the charging process is suspended. Step S22a is an example of a process executed by the charging unit.

[0040] As described above, since the charging process is resumed when the diagnosis process is executed, the charging process can be completed early. Also, if the result of the provisional diagnosis is abnormal, the charging process is not resumed or is interrupted and the integrated ECU 70 is turned off. This makes it possible to prevent the integrated ECU 70 from overheating.

[0041] In the above diagnostic process, an example in which the provisional diagnosis is performed three times has been described, but the number of times the diagnosis is performed is not limited to this, and the diagnosis may be performed only once.

[0042] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0043] 10 Engine 20 Motor 40 Battery 50 Auxiliary battery 70 Integrated ECU (control unit, internal temperature acquisition unit, intake temperature acquisition unit, charging unit, diagnostic unit) 72 Motor ECU (Motor Control Unit) 74 Battery ECU (Battery Control Unit) S2 Intake air temperature sensor S7 Internal Temperature Sensor

Claims

1. A vehicle control device that is mounted on a vehicle having an engine and a battery and controls charging of the battery, An internal temperature acquisition unit that acquires an internal temperature of the control device; an intake temperature acquisition unit that acquires an intake temperature of the engine; a diagnosis unit that switches the control device from off to on while the ignition is off and executes a diagnosis process for an abnormality of the control device based on the internal temperature and the intake air temperature; a charging unit that switches the control device from off to on when the ignition is off to execute a charging process for the battery, When the internal temperature becomes equal to or higher than a threshold value during the execution of the charging process and before the execution of the diagnostic process, the charging unit turns off the control device to interrupt the charging process; The diagnostic unit executes the diagnostic process after the charging process is interrupted, A control device for a vehicle, wherein, when the charging process is interrupted, the charging unit resumes the charging process after executing the diagnosis process.

2. The control device for a vehicle according to claim 1 , wherein the charging unit restarts the charging process after the diagnostic process ends, regardless of a diagnosis result of the diagnostic process.

3. The control device for a vehicle according to claim 1 , wherein the charging unit resumes the charging process when a diagnosis result of the diagnostic process is normal, and does not resume the charging process when a diagnosis result of the diagnostic process is abnormal.

4. The vehicle includes a motor that is a driving power source, a motor control device that controls the motor, and a battery control device that controls the battery, 4. The vehicle control device according to claim 1, wherein the control device controls the engine and the motor control device, and controls the battery control device to execute the charging process.

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