JP2021127722A - Control device of vehicle - Google Patents

Abstract

To provide a control device of a vehicle capable of ensuring more opportunities to start an engine with a motor.SOLUTION: A control device of a vehicle 30 includes an engine 2, a motor 3, a stator 4, a traveling battery 5, and a temperature sensor 7 a current sensor 8, and a voltage sensor 9 that measure the temperature, current and voltage of either one or both of the motor 3 and the traveling battery 5, respectively. While the engine 2 is stopped, in the case of the following (a) or (b), the engine 2 is started with the motor 3. (a) The abnormality of the temperature sensor 7 or the current sensor 8 is detected and the abnormality of the voltage sensor 9 is not detected. (b) The abnormality of the voltage sensor 9 is detected, and the voltage to other units is normal. In the case of the following (c), the engine 2 is started with the starter 4. (c) The abnormality of the voltage sensor 9 is detected, and the voltage to other units is abnormal.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle control device.

There are known vehicles in which the engine can be started by a motor or starter.
For example, Patent Document 1 discloses a hybrid vehicle control device in which an engine is normally started by a motor, and when the temperature of the motor or battery is out of a predetermined range, the engine is started by a starter.

Japanese Unexamined Patent Publication No. 2001-065437

When starting the engine with the starter, the 12V battery that supplies power to the starter consumes a large amount of current. Therefore, the voltage supplied to the electronic devices connected to the 12V battery is greatly reduced. As a result, the power of electronic devices is temporarily turned off due to insufficient voltage, and when the voltage returns after the starter stops operating, a phenomenon occurs in which the electronic devices are restarted.

Electronic devices connected to a 12V battery include, for example, meters and car navigation systems. If a restart occurs at a timing not intended by the user, there is a concern that the commercial value of these products may deteriorate. As a solution to this problem, it is conceivable to equip the vehicle with a BBC (backup boost converter). The BBC boosts the voltage supplied to these devices to prevent them from restarting when the engine is restarted by the starter.

On the other hand, unlike the starter that operates with a 12V battery, the motor is driven by a high-voltage battery. Therefore, if the engine is started by the motor instead of the starter, the 12V battery is not affected and the meter and the like are not restarted. Starting an engine with a motor also has the advantage of being superior in sound, vibration, responsiveness, etc. at the time of starting as compared with the case of starting an engine with a starter.

If the engine can be started by a motor, the problem of restarting the equipment can be solved without mounting the BBC, which is also desirable from the viewpoint of cost reduction. When the BBC is not installed, in order to prevent the problem of restarting the equipment as much as possible, the engine should be started by the starter only when it is unavoidable such as when a part fails, and in other cases, the engine by the motor is used as much as possible. It is required to start.

In the hybrid vehicle control device disclosed in Patent Document 1, the engine is usually started by a motor, and when the temperature of the motor or the power drive unit starts the engine by the motor, these parts are damaged or the life is extended. When the temperature has reached a risk of shortening, the engine is switched to start by a starter.
However, the hybrid vehicle control device of Patent Document 1 has not sufficiently increased the chances of starting the engine by the motor.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a vehicle control device capable of securing more opportunities for starting an engine by a motor.

The vehicle control device according to the present invention is connected to the engine, the motor for starting and generating the engine, the starter for starting the engine, the motor and other units, and is used for traveling the vehicle. A vehicle control device including a motor, a temperature sensor that measures the temperature, current, and voltage of either or both of the motor and the traveling battery, a current sensor, and a voltage sensor, which is the engine. In the case of the following (a) or (b), the engine is started by the motor while the engine is stopped.
(A) When the abnormality of the temperature sensor or the current sensor is detected and the abnormality of the voltage sensor is not detected (b) The abnormality of the voltage sensor is detected and the other is supplied from the traveling battery. When the voltage to the unit is normal In the following case (c), the engine is started by the starter.
(C) When an abnormality of the voltage sensor is detected and the voltage to the other unit supplied from the traveling battery is abnormal With such a configuration, more opportunities for starting the engine by the motor can be secured. A vehicle control device can be provided.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a vehicle control device that can secure more opportunities for starting an engine by a motor.

It is a block diagram which shows the structure of the control device of the vehicle which concerns on embodiment. It is a flowchart which shows the process of the control device of the vehicle which concerns on embodiment. It is a flowchart which shows the process of the control device of the vehicle which concerns on embodiment.

Hereinafter, the vehicle control device according to the embodiment of the present invention will be described with reference to FIG. In FIG. 1, the vehicle 30 includes an engine 2, a motor 3, a starter 4, a traveling battery 5, and an auxiliary battery 6. The traveling battery 5 is provided with a temperature sensor 7, a current sensor 8 and a voltage sensor 9 for measuring the temperature, current and voltage of the traveling battery 5, respectively.

The engine 2 is configured as an internal combustion engine that outputs power using gasoline or the like as fuel.
The motor 3 receives electric power from the traveling battery 5, operates by electric energy, and outputs power. The motor 3 has a function of a starter motor for starting the engine 2. When the vehicle 30 is decelerating, the motor 3 functions as a generator by converting kinetic energy from drive wheels (not shown) into electrical energy and charging the traveling battery 5.
The starter 4 is a starter motor dedicated to starting the engine, which is used for starting the engine 2.

The driving force of the engine 2 and the motor 3 is transmitted to the driving wheels via the transmission 12. The vehicle 30 is a hybrid vehicle that can be driven by either the power output from the engine 2 and the motor 3. The vehicle 30 has an idling stop function that automatically stops the engine 2 when waiting for a traffic light at an intersection or the like.

The traveling battery 5 is provided as a power source for driving the motor 3, and supplies electric power to the motor 3. The traveling battery 5 is, for example, a high-voltage battery having a battery voltage of 300 V, which is configured by connecting a plurality of modules in series with a module in which a plurality of cells are connected in series as one unit.

The auxiliary machine battery 6 is provided as a power source for driving various auxiliary machines, and supplies electric power to the various auxiliary machines. The auxiliary battery 6 has a lower voltage than the traveling battery 5. The auxiliary battery 6 is, for example, a low voltage battery having a battery voltage of 12 V. The auxiliary battery 6 is connected to the traveling battery 5 via the DC / DC converter 13.

The DC / DC converter 13 powers the HV power supply line 24 that connects the motor 3 and the traveling battery 5 with a change in voltage between the auxiliary power supply line 23 that connects the starter 4 and the auxiliary battery 6. To exchange.

The temperature sensor 7 measures the temperature of the traveling battery 5 and transmits a signal representing the temperature to the control device 1.
The current sensor 8 measures the current flowing into the traveling battery 5 or the current flowing out from the traveling battery 5, and transmits a signal representing the current to the control device 1.
The voltage sensor 9 measures the voltage of the traveling battery 5 and transmits a signal representing the voltage to the control device 1.

The electric load 14 is connected to the auxiliary battery 6 and is activated by the electric power supplied from the auxiliary battery 6. The electric load 14 is, for example, a meter, a car navigation system, or the like.
The air conditioner compressor 11 compresses the refrigerant of the air conditioner device mounted on the vehicle 30.

The control device 1 is connected to the engine 2, the motor 3, the starter 4, and the like, and controls the vehicle 30. The control device 1 is configured as a microprocessor centered on a CPU. In addition to the CPU, it has a ROM for storing processing programs, a RAM for temporarily storing data, an input / output port, and a communication port. Signals from various sensors required for controlling the vehicle 30 are exchanged via input / output ports.
The control device 1 acquires the electric energy SOC charged in the traveling battery 5 by a well-known method based on the signals transmitted from the temperature sensor 7, the current sensor 8, and the voltage sensor 9.

The control device 1 has a diagnostic (self-diagnosis) function for detecting an abnormality in each sensor provided in the vehicle 30. A process performed by the control device 1 when a sensor abnormality is detected by the diagnostic function of the control device 1 will be described.

When some sensor abnormality is detected by the diagnostic function of the control device 1, if the engine 2 is operating, the control device 1 is used to avoid starting the engine 2 by the starter 4 after the engine 2 is stopped. , The control for prohibiting the stop of the engine 2 itself is performed. For example, when a sensor abnormality is detected while the vehicle 30 is running, the control device 1 controls the vehicle 30 so as not to stop idling even if the user stops the vehicle 30 to wait for a signal. The control device 1 shifts the vehicle 30 to the fail-safe operation as it is.

When some sensor abnormality is detected by the diagnostic function of the control device 1 and the engine 2 is stopped, the control device 1 can start the engine 2 by the motor 3 based on the content of the detected sensor abnormality. Judge whether or not. The details of the judgment will be described later. When the control device 1 determines that the engine 2 can be started by the motor 3, the motor 3 starts the engine 2, and when it determines that the engine 2 cannot be started, the control device 1 starts the engine 2 by the starter 4. After that, the control device 1 shifts the vehicle 30 to the fail-safe operation.

A method of determining whether or not the control device 1 can start the engine 2 by the motor 3 based on the content of the detected sensor abnormality will be described.

When the control device 1 detects an abnormality in the temperature sensor 7, as a fail-safe method, it is conceivable to turn off the system main relay (not shown) to cut off the connection with the traveling battery 5. However, since it is unlikely that the temperature of the traveling battery 5 will rise sharply, if there is no sensor abnormality other than the temperature sensor 7, the control device 1 will fail-safe the vehicle 30 after the engine 2 is started by the motor 3. Move to operation.

When the control device 1 detects an abnormality in the current sensor 8, as a fail-safe method, as in the case of an abnormality in the temperature sensor 7, the system main relay is turned off to cut off the connection with the traveling battery 5. Can be considered. If the current cannot be detected due to an abnormality in the current sensor 8, the traveling battery 5 may be damaged and the SOC cannot be calculated. However, as compared with the case where the engine 2 is started by the starter 4, the influence on the traveling battery 5 and the user is smaller when the engine 2 is started by the motor 3 once. Therefore, if there is no sensor abnormality other than the current sensor 8, the control device 1 starts the engine 2 by the motor 3 and then shifts the vehicle 30 to the fail-safe operation.

When the control device 1 detects an abnormality in the voltage sensor 9, as a fail-safe method, as in the case of the abnormality in the temperature sensor 7 and the current sensor 8, the system main relay is turned off and the connection with the traveling battery 5 is established. It is possible to block it.

Here, even if an abnormality occurs in the voltage sensor 9, it is possible to measure substantially the same voltage as the voltage sensor 9 in other units while the system main relay is on. The other unit is, for example, a motor 3 or a DC / DC converter 13. Therefore, when an abnormality of the voltage sensor 9 is detected, the control device 1 determines whether or not the voltage of the other unit is normal, thereby determining whether or not the engine 2 can be started by the motor 3. do. If the voltage of the other unit is within the normal value range, there is a high possibility that the voltage sensor 9 is simply abnormal. Therefore, the control device 1 starts the engine 2 by the motor 3 and then the vehicle 30. To fail-safe operation.

On the other hand, when the voltage of the other unit shows an abnormal value, it can be determined that the voltage of the traveling battery 5 itself is abnormal, not just an abnormality of the voltage sensor 9. In that case, since it is impossible to start the engine 2 by the motor 3, the control device 1 starts the engine 2 by the starter 4, and then shifts the vehicle 30 to the fail-safe operation.

When the sensor whose abnormality is detected by the diagnostic function of the control device 1 is neither the temperature sensor 7, the current sensor 8 nor the voltage sensor 9, the control device 1 is driven by the motor 3 due to the characteristics of the detected abnormality. Whether or not the engine 2 can be started is individually determined. When there are a plurality of detected abnormalities, if there is even one that cannot start the engine 2 by the motor 3, the control device 1 determines that the engine 2 cannot be started by the motor 3.

Subsequently, the process executed by the control device 1 will be described with reference to the flowchart shown in FIG.
First, the control device 1 determines whether or not a sensor abnormality is detected by the diagnostic (step S11). The control device 1 proceeds to the next step when a sensor abnormality is detected (YES in step S11), and ends this process when no sensor abnormality is detected (NO in step S11).

Next, the control device 1 determines whether or not the engine 2 is stopped (step S12). When the engine 2 is stopped (YES in step S12), the control device 1 determines whether or not the engine 2 can be started by the motor 3 (step S13). Details will be described later. When the engine 2 is not stopped (NO in step S12), the control device 1 shifts the vehicle 30 to the fail-safe operation (step S16).

When the control device 1 determines that the engine 2 can be started by the motor 3 (YES in step S13), the control device 1 starts the engine 2 by the motor 3 (step S14). When the control device 1 determines that the engine 2 cannot be started by the motor 3 (NO in step S13), the control device 1 starts the engine 2 by the starter 4 (step S15).

After starting the engine 2 by the motor 3 or the starter 4, the control device 1 shifts the vehicle 30 to the fail-safe operation (step S16).

Next, a method of determining whether or not the engine 2 can be started by the motor 3 by the control device 1 will be described with reference to the flowchart shown in FIG.
First, the control device 1 determines whether or not an abnormality has been detected in the temperature sensor 7 (step S21). When the abnormality of the temperature sensor 7 is detected (YES in step S21), the control device 1 determines whether or not the abnormality is detected in the sensors other than the temperature sensor 7 (step S22), and other sensors. If there is no abnormality (NO in step S22), it is determined that the engine 2 can be started by the motor 3 (step S30).

When no abnormality is detected in the temperature sensor 7 (NO in step S21) or when an abnormality is detected in a sensor other than the temperature sensor 7 (YES in step S22), the control device 1 moves to the next step. move on.

Next, the control device 1 determines whether or not an abnormality has been detected in the current sensor 8 (step S23). When an abnormality is detected in the current sensor 8 (YES in step S23), the control device 1 determines whether or not an abnormality is detected in a sensor other than the current sensor 8 (step S24), and another sensor. If no abnormality is detected in (NO in step S24), it is determined that the engine 2 can be started by the motor 3 (step S30).

When no abnormality is detected in the current sensor 8 (NO in step S23) or when an abnormality is detected in a sensor other than the current sensor 8 (YES in step S24), the control device 1 moves to the next step. move on.

Next, the control device 1 determines whether or not an abnormality has been detected in the voltage sensor 9 (step S25). When an abnormality is detected in the voltage sensor 9 (YES in step S25), the control device 1 determines whether or not the voltage of the other unit is normal (step S26). When the voltage of the other unit is normal (YES in step S26), the control device 1 determines whether or not there is an abnormality in a sensor other than the voltage sensor 9 (step S27), and the other sensor has an abnormality. If not (NO in step S27), it is determined that the engine 2 can be started by the motor 3 (step S30). If the voltage of the other unit is not normal in step S26 (NO in step S26), the control device 1 determines that the engine 2 cannot be started by the motor 3 (step S31).

When no abnormality is detected in the voltage sensor 9 (NO in step S25) or when an abnormality is detected in a sensor other than the voltage sensor 9 (YES in step S27), the control device 1 moves to the next step. move on.

When there is a sensor in which an abnormality is detected other than the above-mentioned sensors, the control device 1 individually determines whether or not the engine 2 can be started by the motor 3 based on the characteristics of the detected abnormality (step). S28).
The control device 1 determines whether or not there is at least one abnormality in which it is determined that the engine 2 cannot be started by the motor 3 (step S29). When there is at least one abnormality that can be determined that the engine 2 cannot be started by the motor 3 (YES in step S29), the control device 1 determines that the engine 2 cannot be started by the motor 3 (step). S31). When no such abnormality exists (NO in step S29), the control device 1 determines that the engine 2 can be started by the motor 3 (step S30).

As described above, according to the control device 1 according to the present embodiment, it is appropriately determined whether or not the engine 2 can be started by the motor 3 based on the content of the sensor abnormality, and the engine 2 by the motor 3 More opportunities for starting can be secured.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. For example, although the starter 4 has been described using a starter motor dedicated to starting the engine, which is used for starting the engine 2, the starter 4 may be used for driving the wheels. Further, although the high-voltage battery having a battery voltage of 300 V has been described as the traveling battery 5, the traveling battery 5 may be, for example, a large-capacity capacitor or the like.

1 Control device 2 Engine 3 Motor 4 Starter 5 Driving battery 6 Auxiliary battery 7 Temperature sensor 8 Current sensor 9 Voltage sensor 11 Air conditioner compressor 12 Transmission 13 DC / DC converter 14 Electric load 23 Auxiliary power supply line 24 HV power supply line 30 vehicle

Claims (1)

With the engine
The motor that starts the engine and generates electricity,
The starter that starts the engine and
A traveling battery connected to the motor and other units and used for traveling the vehicle,
A temperature sensor, a current sensor, and a voltage sensor that measure the temperature, current, and voltage of either or both of the motor and the traveling battery, respectively.
It is a vehicle control device equipped with
While the engine is stopped,
In the case of the following (a) or (b), the engine is started by the motor, and the engine is started.
(A) When the abnormality of the temperature sensor or the current sensor is detected and the abnormality of the voltage sensor is not detected (b) The abnormality of the voltage sensor is detected and the other is supplied from the traveling battery. When the voltage to the unit is normal In the following case (c), the engine is started by the starter.
(C) When the abnormality of the voltage sensor is detected and the voltage to the other unit supplied from the traveling battery is abnormal. The vehicle control device.

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