JP2007238022A - Vehicle and its start control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To operate the system start of a vehicle without being accompanied by the start of an internal combustion engine. <P>SOLUTION: An input from a motor traveling switch 74 is input to a power source ECU 60 and an HVECU 50, and the input of a motor traveling switch 74 is accepted before the system start by a power source ECU 60, and when the system is started up in such a status that a motor traveling signal is turned on according to the operation of the motor traveling switch 74, the system is started without starting an engine 32. Thus, it is possible to operate the system start and motor traveling of the vehicle without being accompanied by the start of the engine 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle and a start control method thereof.

Conventionally, as this type of vehicle, there is a hybrid vehicle including an engine, a motor that can output power for traveling, and an EV travel switch that instructs motor travel that travels only by power from the motor with the engine stopped. It has been proposed (see, for example, Patent Document 1). In this vehicle, when the EV travel switch is turned on, the motor travels under the condition that the amount of charge of the battery is within a predetermined range.
JP 2003-333705 A

  In the above-described vehicle, when the system is started, the engine may be started based on the state of the engine, the state of the battery, or the like. Although normal daytime system startup is not a problem, in the state where cleanliness is required, such as late at night or early morning, if the engine is started at system startup, the cleanliness is hindered.

  An object of the vehicle and the start control method of the present invention is to enable the system start of the vehicle without starting the internal combustion engine.

  The vehicle and the activation control method thereof according to the present invention employ the following means in order to achieve the above-described object.

The vehicle of the present invention
An internal combustion engine;
An electric motor capable of outputting driving power;
Operation drive control means for performing operation control of the internal combustion engine and drive control of the electric motor;
Mode instructing means for instructing an electric motor traveling mode in which the internal combustion engine is operated with power from the electric motor in a stopped state;
Start instruction means for instructing the system start of the vehicle;
When system activation is instructed by the activation instructing means in a state in which the electric motor traveling mode is instructed by the mode instructing means, it becomes possible to travel in the electric motor traveling mode without starting the internal combustion engine. Starting control means for starting the operation drive control means,
It is a summary to provide.

  In the vehicle according to the present invention, when the system start-up of the vehicle is instructed in the state in which the motor running mode for running by the power from the motor is instructed while the operation of the internal combustion engine is stopped, the internal combustion engine is not started. Then, an operation drive control means for performing the operation control of the internal combustion engine and the drive control of the electric motor is started so that the vehicle can be driven in the electric motor drive mode. That is, since the system can be activated without starting the internal combustion engine, the system can be activated neatly.

  In such a vehicle of the present invention, the start control means is a mode for holding an instruction of the motor drive mode when the motor drive mode is instructed by the mode instruction means even before the system start is instructed by the start instruction means. It may be a means having an instruction holding unit. In this way, it is possible to start the system while holding the instruction for the electric motor travel mode. As a result, it is possible to improve the operability when starting the system of the vehicle.

  The vehicle according to the present invention further includes: a power generation unit that generates power using at least part of the power from the internal combustion engine; and an electric storage unit capable of exchanging electric power with the motor and the power generation unit. Means controls the internal combustion engine, the electric motor, and the power generation means so as to travel with intermittent operation of the internal combustion engine based on a storage amount of the power storage means when the motor running mode is not instructed; When the traveling mode is instructed, the internal combustion engine, the electric motor, and the power generation unit are configured to travel with the continuation of the operation stop of the internal combustion engine until the amount of power stored in the power storage means becomes less than the predetermined amount of stored power under predetermined conditions. It is also possible to control the means. That is, after the system is started without starting the internal combustion engine, the internal combustion engine is continuously stopped until the amount of power stored in the power storage means becomes less than a predetermined amount of power stored. You can drive cleanly. In addition, overdischarge of the power storage means can be prevented.

  Further, in the vehicle according to the present invention, the power generation means is connected to the output shaft and the axle of the internal combustion engine and is capable of inputting / outputting power to / from the output shaft and the axle with input / output of power and power. It can also be power input / output means.

  Alternatively, the start control means is configured to instruct the motor travel mode by the mode instruction means when the mode instruction means instructs the motor travel mode in a state where the system start by the start instruction means is not instructed. In this state, it is also possible to start the operation drive control means as instructed to start the system by the start instruction means. In this way, the system can be activated only by an instruction for the electric motor traveling mode. As a result, the operability when starting the system of the vehicle can be further improved.

The vehicle activation control method of the present invention includes:
A vehicle start-up control method comprising: an internal combustion engine; an electric motor capable of outputting driving power; and an operation drive control means for performing operation control of the internal combustion engine and drive control of the electric motor.
When the start of the vehicle system is instructed in the state in which the motor travel mode in which the motor is driven by the power from the motor is instructed while the operation of the internal combustion engine is stopped, the motor travel is performed without starting the internal combustion engine. The operation drive control means is activated so as to be able to travel in a mode.

  In this vehicle start control method of the present invention, when the start of the system of the vehicle is instructed in the state in which the motor running mode in which the vehicle is driven by the power from the motor is instructed while the operation of the internal combustion engine is stopped, An operation drive control means for performing the operation control of the internal combustion engine and the drive control of the electric motor is activated so that the vehicle can be driven in the electric motor drive mode without being started. That is, since the system can be activated without starting the internal combustion engine, the system can be activated neatly.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 according to an embodiment of the present invention. The hybrid vehicle 20 of the embodiment functions as a power control system 30 that outputs power to a drive shaft 22 connected to drive wheels 26a and 26b via a differential gear 24, and a vehicle start control device including the power system 30. And a power supply electronic control unit (hereinafter referred to as a power supply ECU) 60.

The power system 30 includes an engine 32, an engine electronic control unit (hereinafter referred to as an engine ECU) 36 that controls the operation of the engine 32, a carrier connected to the crankshaft 34 of the engine 32, and a ring gear connected to the drive shaft 22. Are connected to each other, a power generating motor 40 connected to the sun gear of the planetary gear mechanism 38, a power generating motor 41 for inputting / outputting power to / from the drive shaft 22, and driving of the motors 40, 41. Inverters 42 and 43 as circuits, a battery 44 as a power source connected to the inverters 42 and 43 and other auxiliary machines 48 included in the power system 30 via a system main relay 46, and the entire power system 30 are controlled. Electronic control unit for hybrid (hereinafter referred to as HVECU) Say.) Provided with a 50 and.

  The HVECU 50 is configured as a microcomputer centering on a CPU (not shown), and includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, a communication port, and the like in addition to the CPU. The HVECU 50 includes a rotation position from a rotation position detection sensor (not shown) that detects the rotation position of the rotor of the motors 40 and 41, and a current sensor (not shown) attached to the power line from the inverters 42 and 43 to the motors 41 and 42. Shift for detecting phase current, output voltage and output current from a voltage sensor (not shown) installed near the output terminal of the battery 44, current from the temperature sensor, battery temperature from the temperature sensor attached to the battery 44, and shift lever operating position The shift position from the position sensor, the accelerator opening from the accelerator pedal position sensor that detects the amount of depression of the accelerator pedal, the brake pedal position from the brake pedal position sensor that detects the amount of depression of the brake pedal, the vehicle speed from the vehicle speed sensor, etc. Data from various sensors for detecting the state of the dynamic system is input through the input port. The HVECU 50 outputs switching signals to the inverters 42 and 43, a drive signal to the system main relay 46, a drive signal to the auxiliary machine 48, and the like. The HVECU 50 is connected to the engine ECU 36 via a communication port, and receives detection signals from various sensors attached to the engine 32 from the engine ECU 36 and calculation results calculated based on the detection signals as necessary. In addition, a control signal is output to the engine ECU 36 as a command for controlling the operation of the engine 32. The HVECU 50 is also connected to the power supply ECU 60 via a communication port, and receives an ignition signal, a start signal, a motor travel signal, etc. from the power supply ECU 60 and outputs a ready signal indicating the activation state of the power system 30 to the power supply ECU 60. To do.

  The HVECU 50 calculates a required torque to be output to the drive shaft 22 based on the accelerator opening corresponding to the amount of depression of the accelerator pedal by the driver and the vehicle speed, and the required power corresponding to the required torque is output to the drive shaft 22. In addition, the operating point of the engine 32 and the torque command of the motors 40 and 41 are calculated so that the remaining capacity (SOC) of the battery 44 is within a predetermined range and the engine 32 is operated efficiently. The operation point of the engine 32 is output to the engine ECU 36 to cause the engine ECU 36 to control the operation of the engine 32, and the torque commands of the motors 40 and 41 are output from the motors 40 and 41, respectively. A switching signal is output to inverters 42 and 43 to 40 and 41 for controlling driving. As the operation drive control of the engine 32 and the motors 40 and 41, the engine 32 is operated and controlled so that power corresponding to the required power is output from the engine 32, and all the power output from the engine 32 is transmitted to the planetary gear mechanism 38. Torque conversion is performed by the motors 40 and 41 so as to be output to the drive shaft 22. The torque conversion operation mode for driving and controlling the motors 40 and 41, and the power suitable for the sum of the required power and the power required for charging and discharging the battery 44 are obtained. The engine 32 is controlled to be output from the engine 32, and all or part of the power output from the engine 32 with charge / discharge of the battery 44 is converted by the planetary gear mechanism 38 and the motors 40 and 41. The motors 40 and 41 are driven and controlled so that the required power is output to the drive shaft 22 along with That charge-discharge drive mode, there is a motor operation mode in which operation control so as to stop operation of the engine 32 to output power to meet the required power from the motor 41 to the drive shaft 22. Since detailed control of the power system 30 does not form the core of the present invention, further detailed description is omitted.

  The power supply ECU 60 is configured as a microcomputer centering on a CPU (not shown). In addition to the CPU, a ROM that stores processing programs, a RAM that temporarily stores data, a flash memory 62 that holds stored data, an input memory Equipped with output port, communication port, etc. The power supply ECU 60 includes a push signal from a power switch 72 attached to a front panel of the driver's seat, a motor travel signal from a motor travel switch 74, a brake switch signal from a brake switch 76 that detects depression of a brake pedal (not shown), and the like. Is input via the input port. As described above, the power supply ECU 60 is also connected to the HVECU 50 of the power system 30 via the communication port. The push signal from the power switch 72, the motor travel signal from the motor travel switch 74, and the brake from the brake switch 76 are connected. Based on the switch signal, the power supply to the low voltage system is turned on and off, and the start of the power system 30 is controlled. Details of the connection relationship between the power supply ECU 60 and the HVECU 50 are shown in FIG.

  Each time the power switch 72 is pushed and a push signal is input, the power supply ECU 60 connects the battery as a low voltage power source to the system with an accessory on (ACCON), and the HVECU 50 supplies the power source (high voltage) of the power system 30. Ignition ON (IGON) for connecting the battery 44 as a system) by the system main relay 46, and disconnecting the battery 44 as a low voltage system power source or a high voltage system power source to stop the system It controls so that each state of OFF (IGOFF) repeats in this order.

  Further, when the motor travel switch 74 is pressed, the power supply ECU 60 stores and holds a motor travel signal (EV signal) as an ON signal in the flash memory 62. The motor travel signal stored in the flash memory 62 is released when a predetermined time (for example, 10 seconds) elapses before the power system 30 is activated or when the motor travel switch 74 is pressed again, and the power system After 30 is activated, it is immediately transmitted to the HVECU 50. Since the motor travel signal is also directly input to the HVECU 50, the motor travel signal may not be transmitted from the power supply ECU 60 to the HVECU 50 after the power system 30 is activated. Further, the power supply ECU 60 turns on or off the indicator 75 each time the motor travel switch 74 is pressed to inform the driver of the state of the motor travel signal.

  Next, the operation of the hybrid vehicle 20 of the embodiment configured in this way, particularly the operation when the vehicle is activated will be described. FIG. 3 is a flowchart showing an example of a startup control routine executed by the power supply ECU 60, and FIG. 4 is a flowchart showing an example of a startup processing routine executed by the HVECU 50 to which a start signal or the like output from the power supply ECU 60 is input. is there. The activation control routine is executed when the power switch 72 is pressed while the brake pedal is depressed.

  When the activation control routine is executed, the power supply ECU 60 first determines whether or not a motor running signal (EV signal) as an on signal is stored in the flash memory 62 (step S100), and the motor as an on signal. When the running signal (EV signal) is not stored, the ignition signal (IG signal) and the start signal (ST signal) are turned on and the motor running signal (EV signal) is turned off (step S110). This routine is terminated. On the other hand, when the motor running signal (EV signal) as the ON signal is stored in the flash memory 62, not only the ignition signal (IG signal) and the start signal (ST signal) but also the motor running signal (EV signal) are sent to the HVECU 50. Is also output (step S120), and this routine is terminated.

  When the HVECU 50 is started and the startup processing routine is executed, the HVECU 50 first turns on the system main relay 46 to check whether or not the power system 30 is ready to start (step S200). ). As this confirmation process, for example, a process for confirming whether or not an abnormality has occurred in the engine 32 via the engine ECU 36, or a confirmation of whether or not the motors 40 and 41 and the inverters 42 and 43 are normally operable. And the like. When an abnormality is confirmed in the power system 30 and it cannot be activated, it is determined that some abnormality has occurred (step S210), the system main relay 46 is turned off, and a ready signal indicating the activation state of the power system 30 is sent to the power supply ECU 60. (RDY signal) is turned off and a request to turn off the ignition (IGOFF) is outputted (steps S220 and S230), and this routine is terminated. When an ignition-off (IGOFF) request from the HVECU 50 is input, the power supply ECU 60 shuts down the entire vehicle, for example, shuts off the power supply to the low voltage system when the power switch 72 is next pressed.

  When the power system 30 is in a state where it can be started without any abnormality being confirmed, it is determined to be normal (step S210), and it is determined whether the motor travel signal (EV signal) from the power supply ECU 60 is output on or off. (Step S240). When the motor running signal (EV signal) is output off, it is determined whether or not the start condition of the engine 32 is satisfied (step S250). When the start condition is satisfied, the drive control at the start of the engine 32 is performed. Is performed (step S260). Here, as a starting condition of the engine 32, the engine water temperature from a cooling water temperature sensor (not shown) attached to the engine 32 is less than a relatively low temperature (for example, 40 ° C., 45 ° C., etc.) Examples include a condition where the capacity (SOC) reaches a state below a threshold (for example, 40%, 45%, etc.). The start-up drive control of the engine 32 increases the rotational speed of the engine 32 by the cranking torque from the motor 40 and starts the fuel injection control and the ignition control to cause the engine 32 to complete explosion. 32 is controlled. When the start-up drive control process is completed, or when the start condition of the engine 32 is not satisfied even if the motor travel signal is OFF, a ready signal (RDY signal) is output to the power supply ECU 60 (step S270). ), This routine is terminated. Thus, when the system is started in a state where the motor travel signal (EV signal) is output from the power supply ECU 60, when the driver subsequently operates the shift lever to a travel position (for example, D position), the vehicle The vehicle travels by switching the above-described torque conversion operation mode, charge / discharge operation mode, and motor operation mode according to the state. For example, the engine 32 is started when the power or the required torque required for the vehicle exceeds a start threshold, and the engine 32 is stopped when the power or the required torque required for the vehicle falls below a stop threshold. The vehicle travels with 32 intermittent operations.

  When the motor travel signal (EV signal) is output from the power supply ECU 60 in step S240, the ready signal (RDY signal) is output to the power supply ECU 60 without executing the start-time drive control of the engine 32 (step S240). S270), this routine is finished. When the system is started in a state where the motor travel signal is output from the power supply ECU 60 as described above, when the driver subsequently operates the shift lever to a travel position (for example, D position), the remaining capacity of the battery 44 ( The motor travels without starting the engine 32 until the SOC) falls below a threshold value set as a value slightly larger than the capacity capable of starting the engine 32 or the required torque required for the vehicle exceeds the rated torque of the motor 41. Travel by.

  According to the hybrid vehicle 20 of the embodiment described above, since the system is activated by receiving the input signal of the motor travel switch 74 before the system is activated, the system is activated with the motor travel signal being turned on by the operation of the motor travel switch 74. In doing so, the system can be started without the engine 32 being started. As a result, the vehicle can be driven with the motor running cleanly.

  In the hybrid vehicle 20 of the embodiment, the motor travel signal is held in the flash memory 62 of the power supply ECU 60. However, the power supply ECU 60 is not provided with the flash memory 62 because it is sufficient that the motor travel signal can be received before starting the system. It may be a thing.

  In the hybrid vehicle 20 of the embodiment, the power of the engine 32 is output to the drive shaft 22 connected to the drive wheels 26a and 26b via the planetary gear mechanism 38, or the power of the motor 41 is output to the drive shaft 22 to travel. However, the power from the engine and the power from the motor may be output to different drive shafts, or the power from the engine may be used for power generation to travel only by the power from the motor. It may be a thing.

  In the hybrid vehicle 20 of the embodiment, the system is activated by receiving a motor travel signal before the system is activated. However, when the motor travel switch 74 is operated with the brake pedal depressed before the system is activated, the motor travel is performed. The system may be activated as if the power switch 72 was operated by depressing the brake pedal with the signal turned on. In this way, the system can be activated simply by depressing the brake pedal and operating the motor travel switch 74.

  In the embodiment, the embodiment of the present invention has been described using the hybrid vehicle 20, but it may be in the form of a vehicle such as a train other than the automobile, or in the form of a vehicle activation control method.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the vehicle manufacturing industry.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 according to an embodiment of the present invention. It is explanatory drawing which shows the detail of the connection relation of power supply ECU60 and HVECU50. 4 is a flowchart illustrating an example of a startup control routine executed by a power supply ECU 60. 3 is a flowchart showing an example of a startup processing routine executed by an HVECU 50;

Explanation of symbols

20 hybrid vehicle, 22 drive shaft, 24 differential gear, 26a, 26b drive wheel, 30 power system, 32 engine, 34 crankshaft, 36 engine ECU, 38 planetary gear mechanism, 40, 41 motor, 42, 43 inverter, 44 battery , 46 System main relay, 48 Auxiliary machine, 50 HVECU, 60 Power supply ECU, 72 Power switch, 74 Motor travel switch, 75 Indicator, 76 Brake switch.

Claims (6)

An internal combustion engine;
An electric motor capable of outputting driving power;
Operation drive control means for performing operation control of the internal combustion engine and drive control of the electric motor;
Mode instructing means for instructing an electric motor traveling mode in which the internal combustion engine is operated with power from the electric motor in a stopped state;
Start instruction means for instructing the system start of the vehicle;
When system activation is instructed by the activation instructing means in a state in which the electric motor traveling mode is instructed by the mode instructing means, it becomes possible to travel in the electric motor traveling mode without starting the internal combustion engine. Starting control means for starting the operation drive control means,
A vehicle comprising:   The activation control means is a means having a mode instruction holding unit that holds an instruction of the motor running mode when the motor running mode is instructed by the mode instructing means even before the system activation is instructed by the activation instructing means. The vehicle according to claim 1. The vehicle according to claim 1 or 2,
Power generation means for generating power using at least part of the power from the internal combustion engine;
Power storage means capable of exchanging electric power with the electric motor and the power generation means;
With
The operation drive control means controls the internal combustion engine, the electric motor, and the power generation means so as to run with intermittent operation of the internal combustion engine based on a storage amount of the power storage means when the motor running mode is not instructed. When the electric motor travel mode is instructed, the internal combustion engine and the internal combustion engine are allowed to travel with a continuation of the stop of the operation of the internal combustion engine until the power storage amount of the power storage means becomes less than a predetermined power storage amount under predetermined conditions. A vehicle which is a means for controlling an electric motor and the power generation means.   The power generation means is power power input / output means connected to an output shaft and an axle of the internal combustion engine and capable of inputting / outputting power to / from the output shaft and the axle with input / output of electric power and power. 3. The vehicle according to 3.   The start control means is a state in which the motor travel mode is instructed by the mode instructing means when the motor travel mode is instructed by the mode instructing means when the system instructing by the start instructing means is not instructed. The vehicle according to any one of claims 1 to 4, which is means for activating the driving drive control means on the assumption that system activation is instructed by the activation instruction means. A vehicle start-up control method comprising an internal combustion engine, an electric motor capable of outputting driving power, and an operation drive control means for performing operation control of the internal combustion engine and drive control of the electric motor,
When the start of the vehicle system is instructed in the state in which the motor travel mode for traveling by the power from the motor is instructed while the operation of the internal combustion engine is stopped, the motor travel is performed without starting the internal combustion engine. Starting the driving control means so as to be able to run in a mode;
Vehicle activation control method.

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