JP5942895B2 - Hybrid vehicle travel control device - Google Patents

Description

  The present invention relates to a travel control device for a hybrid vehicle, and more particularly to a travel control device for a hybrid vehicle equipped with a hybrid system that causes the vehicle to travel hybridly, for example, with a motor and an engine.

  2. Description of the Related Art Conventionally, a travel control device for a hybrid vehicle equipped with a hybrid system that causes the vehicle to travel hybridly with a motor and an engine is known (see, for example, Patent Document 1). In this travel control device, as a hybrid system, typically, hybrid travel in which wheels are driven using both a motor that generates torque by supplying power from a battery and an engine that generates torque by supplying fuel can be executed. . On the other hand, if the battery or the inverter interposed between the battery and the motor breaks down while the vehicle is traveling, the battery-less traveling in which the charging / discharging of the battery is prohibited and the wheels are driven only by the engine is performed as the fail-safe mode. .

Claim 8 of JP 2007-203883 A, etc.

  By the way, in a vehicle, the wire harness which connects a battery and the electronic control unit (ECU) of a traveling control apparatus may cause temporary contact failure. If a contact failure occurs during the running of the hybrid vehicle, the power supplied to the ECU is turned off even temporarily, so that the hybrid system is turned off, and thereafter, the hybrid running is impossible in the state as it is. . In order to enable hybrid travel in such a situation, it is necessary for the vehicle driver to start the hybrid system again by operating a start switch for the hybrid system.

  However, the temporary power-off due to the poor contact of the wire harness is not a failure of the unit itself such as a battery or an inverter. In this regard, if such a temporary power-off occurs and the hybrid system is turned off until the vehicle driver operates the start switch, hybrid driving is possible even if no vehicle failure has occurred. However, the switch operation of the vehicle driver is forced, and the convenience of the vehicle driver is impaired.

  The present invention has been made in view of the above points, and can prevent the hybrid system from being turned off due to temporary power-off during traveling from continuing against the intention of the vehicle driver. An object of the present invention is to provide a travel control device for a hybrid vehicle.

  The above object is a travel control device for a hybrid vehicle equipped with a hybrid system that is started by a predetermined switch operation and hybrid-runs the vehicle, and the power supplied to the hybrid system is switched from on to off. After the hybrid system is turned off, a power state discriminating unit that discriminates whether or not the power source is switched from off to on within a predetermined time; and after the hybrid system is turned off by the power source state discriminating unit, the predetermined time When it is determined that the power source has been switched from off to on, the user intention determination means for determining whether or not the hybrid system is off is intended by the vehicle driver, and the user intention determination means Off of hybrid system is not intended by vehicle driver If it is determined, it is achieved by the traveling control apparatus for a hybrid vehicle and a system control means for automatically returning the hybrid system.

  According to the present invention, it is possible to prevent the hybrid system from being turned off due to temporary power-off during traveling from continuing against the intention of the vehicle driver.

1 is a configuration diagram of a travel control device for a hybrid vehicle that is an embodiment of the present invention. FIG. It is a flowchart of an example of the control routine performed in the traveling control apparatus of a present Example. It is a time chart showing the relationship between a power supply state and the on / off state of a hybrid system in the traveling control apparatus of a present Example.

  Hereinafter, specific embodiments of a travel control device for a hybrid vehicle according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration diagram of a system mounted on a hybrid vehicle including a travel control device 10 according to an embodiment of the present invention. The travel control device 10 of the present embodiment is a device that controls the travel of a hybrid vehicle that travels in a hybrid manner using, for example, both a motor and an engine. This hybrid vehicle is equipped with a hybrid system that allows the host vehicle to travel in a hybrid manner.

  As shown in FIG. 1, the hybrid vehicle includes a body electronic control unit (hereinafter referred to as a body ECU) 12 mainly composed of a microcomputer. The body ECU 12 is a device capable of controlling the power position of the own hybrid vehicle. For example, it controls the drive of the power relay (specifically, the ACC relay and the IG relay 14) and controls the generation of the start signal and stop signal of the hybrid system.

  The body ECU 12 is connected to a power switch 16 and a brake switch 18 operated by a vehicle driver. The power switch 16 is a switch that is pressed to switch the power position of the own hybrid vehicle among an off state, an accessory on state, an ignition on state, and a hybrid system on state. The brake switch 18 is a switch that is turned on when the brake pedal is depressed by the vehicle driver. The body ECU 12 determines whether the power switch 16 is pressed and determines whether the brake switch 18 is on / off. Based on the determination result, the power position of the own hybrid vehicle is controlled.

  For example, if the body ECU 12 determines that the power switch 16 is pressed at the same time as the brake switch 18 is turned on in a situation where the hybrid system is in the off state, the body position is changed from the off state, the accessory on state, or the ignition on state. Switch to the hybrid system on state. When such switching is performed, the ACC relay and the IG relay 14 are turned on, and the system main relay of the hybrid system is turned on.

  When the body ECU 12 determines that the power switch 14 is pressed in a state where the hybrid system is in the on state, the body ECU 12 switches the power supply position from the hybrid system on state to the off state or the accessory on state. When such switching is performed, the IG relay 14 is turned off and the system main relay of the hybrid system is turned off.

  It should be noted that the above-described transition of the power supply position may be performed only when collation between the own hybrid vehicle and the portable key carried by the authorized vehicle driver matches. The transition position of the power supply position described above may be varied depending on whether the brake switch 18 is turned on or off, or further whether the shift position of the own hybrid vehicle is in the parking range. Furthermore, the transition from the hybrid system on state to the off state or the accessory on state of the power supply position described above may be performed only when the own hybrid vehicle is stopped.

  Connected to the body ECU 12 is a hybrid electronic control unit (hereinafter referred to as an HV-ECU) 20 mainly composed of a microcomputer. The HV-ECU 20 is a device that controls the start of the hybrid system (that is, controls the drive of the system main relay) to control the traveling of the own hybrid vehicle. When it is determined that the power supply position should be switched to the hybrid system on state, the body ECU 12 generates a hybrid system activation signal and supplies it to the HV-ECU 20. Further, when it is determined that the power supply position should be switched to the hybrid system off state, a hybrid system stop signal is generated and supplied to the HV-ECU 20.

  When the hybrid system activation signal is supplied from the body ECU 12, the HV-ECU 20 activates the hybrid system when the predetermined traveling condition is satisfied and the own hybrid vehicle can travel (that is, the system). By switching on the main relay, the operation mode when the hybrid vehicle is traveling can be switched as will be described later, and an indicator lamp in the combination meter indicating that the hybrid system is in an on state is turned on. .

  The hybrid system includes an HV-ECU 20 necessary for hybrid running of the own hybrid vehicle, and various devices 22 connected to the HV-ECU 20 (for example, an engine ECU that performs engine control, a motor ECU that performs motor control, a motor A battery ECU for monitoring a drive battery for supplying power to the power supply, a DC-DC converter interposed between the drive battery and the auxiliary battery, a boost converter for boosting the voltage of the drive battery, and the like. The hybrid system is activated when a hybrid system activation signal is supplied from the body ECU 12 to the HV-ECU 20 and various devices 22 and the like constituting the hybrid system are powered by being turned on when the IG relay 14 is turned on. It is turned on.

  When the hybrid system is turned on, depending on the driving operation of the vehicle driver and the traveling condition of the own hybrid vehicle, the operation mode is stopped by the engine traveling mode in which the engine power is mechanically transmitted to the wheels and the engine is stopped. Thus, it is possible to switch between an EV traveling mode in which only the motor power is transmitted to the wheels and a hybrid traveling mode in which the power of the engine and the motor is transmitted to the wheels. The operation mode may include a power generation mode in which power is generated by engine power, a regeneration mode in which power is generated by a motor during vehicle deceleration, and energy is recovered.

  When the power switch 16 is pressed while the hybrid system is on, a hybrid system stop signal is supplied from the body ECU 12 to the HV-ECU 20, so that the hybrid system shifts from the on state to the off state. In this case, the power position is switched to the off state or the accessory on state, and the various devices 22 constituting the hybrid system become inoperable when the power supply is stopped when the IG relay is turned off.

  Further, the HV-ECU 20 is supplied with power via the IG relay 14 (IG power supply) and also directly supplied with power from an auxiliary battery (+ B power supply). The HV-ECU 20 can be operated by electric power supplied from an auxiliary battery that is a + B power source. The HV-ECU 20 determines whether or not the power supply to the hybrid system is stopped based on whether or not the supply voltage of the IG power supplied via the IG relay 14 is less than a predetermined voltage. Has a function of determining whether or not is in an off state. Further, the HV-ECU 20 has a function of determining whether or not the own hybrid vehicle is in a traveling state or a stopped state using a wheel speed sensor or the like.

  Hereinafter, with reference to FIG.2 and FIG.3, the operation | movement in the traveling control apparatus 10 of a present Example is demonstrated. FIG. 2 shows a flowchart of an example of a control routine executed in the travel control device 10 of the present embodiment. FIG. 3 is a time chart showing the relationship between the power supply state and the on / off state of the hybrid system in the travel control device 10 of this embodiment.

  In this embodiment, when the body ECU 12 determines that the power switch 16 is pressed at the same time as the brake switch 18 is turned on in a situation where the hybrid system is in the off state, the power supply position is set to the off state, the accessory on state, or the ignition. Switch from the on state to the hybrid system on state to generate a start signal for the hybrid system.

  The HV-ECU 20 activates the hybrid system according to the hybrid system activation signal supplied from the body ECU 12, and lights an indicator lamp indicating that the hybrid system is on. When the hybrid system is in the on state, the own hybrid vehicle generates motor power and engine power with appropriate distribution according to the driving operation and driving state of the vehicle driver under the control of the HV-ECU 20, respectively. It is possible to travel.

  When the HV-ECU 20 activates the hybrid system (step 100), the HV-ECU 20 thereafter supplies power to the hybrid system based on whether or not the supply voltage of the IG power source via the IG relay 14 is less than a predetermined voltage. It is determined whether or not it is stopped, that is, whether or not the IG power supply of the hybrid system is in an off state. The predetermined voltage is the minimum supply voltage at which various devices can operate.

  As a result, the HV-ECU 20 is supplying the IG power to the hybrid system because the supply voltage of the IG power to the hybrid system via the IG relay 14 is equal to or higher than a predetermined voltage. If it is determined that the hybrid system is on, the hybrid system is kept on. In this case, the own hybrid vehicle can travel in a hybrid manner.

  On the other hand, when the supply voltage of the IG power supply to the hybrid system via the IG relay 14 is less than a predetermined voltage, the supply of the IG power supply to the hybrid system is stopped, and it is determined that the IG power supply is in an off state. If so (step 102), the hybrid system is switched from on to off (step 104). When the hybrid system is turned off, it is prohibited that the operation mode becomes at least the hybrid travel mode, so that the hybrid vehicle cannot perform hybrid travel using at least both engine power and motor power. . At this time, the indicator lamp indicating that the hybrid system is on is turned off.

  Note that even if the hybrid system is switched from the on state to the off state while the hybrid vehicle is traveling, the operation mode may be permitted to be the engine traveling mode in which only the engine power is traveled. By prohibiting charging / discharging of the driving battery, the hybrid vehicle may be able to travel without a battery using only the engine power without using the motor power of the driving battery.

  When the HV-ECU 20 switches the hybrid system from on to off in step 104, the HV-ECU 20 counts the time after the switching and determines whether the supply voltage of the IG power source via the IG relay 14 is equal to or higher than the predetermined voltage. Based on the above, it is determined whether or not the IG power is supplied to the hybrid system via the IG relay, that is, whether or not the IG power of the hybrid system is in the on state.

  Then, after the hybrid system is turned off, it is determined whether or not the IG power supply of the hybrid system is switched from off to on within a predetermined time (step 106). The predetermined time is the longest time during which it can be determined that a temporary power-off (instant interruption) such as a contact failure of the wire harness connecting the HV-ECU 20 and the IG power source has occurred, and is set to 50 msec, for example. . As a result, if it is determined that the IG power supply of the hybrid system is maintained in the OFF state even after a predetermined time has elapsed after the hybrid system is turned off, the current routine is terminated without any further processing.

  On the other hand, if it is determined that the IG power supply of the hybrid system is turned on after the hybrid system is turned off and before a predetermined time has elapsed (step 108), the current state of the hybrid system is turned off by the vehicle driver. It is determined whether or not the intention is intended (step 110). This determination may be performed based on the operation history of the power switch 16 by the vehicle driver provided by the body ECU 12, and the hybrid system is turned off due to the pressing operation of the power switch 16. On the other hand, if the hybrid system is turned off due to power-off in step 104, the answer is negative.

  If the HV-ECU 20 determines in step 110 that the hybrid system has been turned off as intended by the vehicle driver, the HV-ECU 20 ends the current routine without any further processing. On the other hand, if it is determined that the hybrid system was not turned off by the vehicle driver, the hybrid system is switched from the off state to the on state, thereby returning the hybrid system to the on state (that is, the system main Turn on the relay; step 112). When the hybrid system is returned to the on state, an indicator lamp indicating that the hybrid system is on is turned on.

  As described above, in the travel control device 10 of the present embodiment, when the hybrid system is turned off due to power off, the hybrid system is turned off when the power is switched from off to on within a predetermined time. If the hybrid system is not intended to be turned off by the vehicle driver, the hybrid system can be automatically returned to the on state. it can.

  In this regard, according to the traveling control device 10 of the present embodiment, when the temporary IG power supply is turned off for a short time due to poor contact of the wire harness, the hybrid system caused by the temporary IG power supply off. It is possible to prevent the off-time from continuing for a long time against the intention of the vehicle driver, and to avoid the situation where the own hybrid vehicle cannot be accelerated due to the off of the hybrid system during traveling. Can do. If the hybrid system is automatically returned to the ON state, the hybrid system is restarted without the vehicle driver operating the power switch 16 or the brake switch 18, so that the hybrid vehicle can be made to travel hybridly thereafter. In addition, it is not necessary to force the vehicle driver to perform a switch operation in order to make the hybrid vehicle travel in a hybrid manner.

  Therefore, according to this embodiment, even if the IG power supply is temporarily turned off while the hybrid vehicle is running, the hybrid system can be automatically restarted immediately by the recovery of the IG power supply. It is possible to ensure the normal running of the own hybrid vehicle to some extent without impairing the convenience of the vehicle.

  In particular, when the hybrid system is switched from the on state to the off state during traveling of the own hybrid vehicle, only the operation mode is allowed to be the engine running mode and the own hybrid vehicle can travel without battery. In a certain configuration, if the hybrid system is not automatically started in the above situation, there may be a problem that the battery-less running continues for a long time even after the IG power source is switched from off to on. On the other hand, according to the configuration of the present embodiment, the hybrid system is automatically activated in the above-described situation, so that the hybrid vehicle can be run after the IG power source is switched from off to on. It is possible to prevent the batteryless running of the vehicle from continuing for a long time.

  In the above embodiment, pressing the power switch 16 corresponds to “predetermined switch operation” described in the claims, and the IG power supply corresponds to “power supply” described in the claims. . Further, after the HV-ECU 20 turns off the hybrid system due to the IG power source being turned off, it is determined whether or not the IG power source of the hybrid system is switched from off to on within a predetermined time. When the HV-ECU 20 executes the processing of step 110 in the routine shown in FIG. 2, the “user intention determination unit” described in the claims is replaced by the HV-ECU 20 in step 112. When the HV-ECU 20 turns off the hybrid system due to turning off of the IG power supply, the charging and discharging of the driving battery is prohibited thereafter by executing the processing. By doing so, the engine can be driven without using motor power from the driving battery. Set forth in the appended claims by traveling batteryless using a force only "running control means" are realized respectively.

  By the way, in the above embodiment, when the temporary IG power supply is turned off, the temporary hybrid IG power supply is turned off and stored in the own hybrid vehicle or notified to the vehicle driver. Although not a thing, you may perform such a diagnostic memory | storage or notify a vehicle driver. According to such a modification, the vehicle inspection can be efficiently performed according to the diagnosis memory, and the vehicle driver can be prompted to perform the vehicle inspection.

  In the above embodiment, the HV-ECU 20 counts the time after the hybrid system is switched from the on state to the off state due to the IG power source being turned off, and the IG power source of the hybrid system is within a predetermined time. Determine whether or not to switch from off to on, but count the time after the IG power supply switches from on to off, and after switching the hybrid system from on to off due to the IG power off, as described above It may be determined whether or not the IG power supply of the hybrid system is switched from OFF to ON before the predetermined time has elapsed for the counted time.

  In the above-described embodiment, the HV-ECU 20 determines whether or not the hybrid system has been turned off at the step 110 by the vehicle driver. The operation history of the power switch 16 and the like is used, and after turning on / off the IG power supply of the hybrid system based on the supply voltage of the IG power supply supplied via the IG relay 14, It is determined whether or not the hybrid system has been turned off by the vehicle driver based on whether or not the power switch 16 is operated by the vehicle driver provided by the body ECU 12 before and after the switch is turned off. It is good.

  That is, it is determined whether the IG power source is switched from on to off and / or from off to on was intended by the vehicle driver, and the hybrid system is turned off based on the determination result. It is good also as discriminating whether it was what the driver intended. Note that the hybrid system is turned off when switching the IG power source from on to off is intended by the vehicle driver and when switching the IG power source from off to on is intended by the vehicle driver. It is preferable to determine that the vehicle driver intended, but one of the IG power source switching from on to off and off to on switching is intended by the vehicle driver. If it is, the hybrid system may be determined to have been turned off by the vehicle driver.

  In the above embodiment, the condition for automatically returning the hybrid system does not include that the own hybrid vehicle is traveling, but the hybrid system is automatically operated on the condition that the own hybrid vehicle is traveling. It may be restored. That is, the hybrid system may not be automatically returned when the own hybrid vehicle is stopped.

  Furthermore, although the above embodiment is applied to a hybrid vehicle that travels in a hybrid manner using motor power and engine power, the present invention is not limited to this, and a hybrid vehicle that travels in a hybrid manner with other power combinations. It is good also as applying to.

10 travel control device 12 body ECU
14 IG relay 16 Power switch 18 Brake switch 20 HV-ECU

Claims (5)

A travel control device for a hybrid vehicle equipped with a hybrid system that is activated by a predetermined switch operation and causes the vehicle to travel hybridly,
A power state determination means for determining whether or not the power source is switched from off to on within a predetermined time after the hybrid system is turned off by switching the power source supplied to the hybrid system from on to off;
Whether the hybrid system was intended to be turned off by the vehicle driver when it is determined that the power supply has been switched from off to on within the predetermined time after the hybrid system is turned off by the power supply state determination means. User intention determination means for determining whether or not,
System control means for automatically returning the hybrid system when it is determined by the user intention determination means that the off of the hybrid system is not intended by the vehicle driver;
A travel control device for a hybrid vehicle, comprising:   The system control means maintains the hybrid system off when the user intention determination means determines that the hybrid system is off by the vehicle driver. A travel control device for a hybrid vehicle as described.   The hybrid vehicle according to claim 1, further comprising a travel control unit that executes battery-less travel using engine power when the hybrid system is turned off due to the power being turned off. Travel control device.   When the hybrid system is turned on after starting the battery-less travel, the travel control means executes hybrid travel using the engine power and motor power by power supply from a drive battery. The travel control device for a hybrid vehicle according to claim 3, wherein the travel control device is a hybrid vehicle.   The user intention determination means is based on whether or not the first switching from on to off of the power source and / or the second switching from off to on of the power source is intended by the vehicle driver. 5. The travel control apparatus for a hybrid vehicle according to claim 1, wherein it is determined whether or not the hybrid system is turned off by a vehicle driver.

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