WO2012053601A1 - エンジン始動制御装置、ハイブリッド自動車およびエンジン始動方法、並びにプログラム - Google Patents
エンジン始動制御装置、ハイブリッド自動車およびエンジン始動方法、並びにプログラム Download PDFInfo
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- WO2012053601A1 WO2012053601A1 PCT/JP2011/074175 JP2011074175W WO2012053601A1 WO 2012053601 A1 WO2012053601 A1 WO 2012053601A1 JP 2011074175 W JP2011074175 W JP 2011074175W WO 2012053601 A1 WO2012053601 A1 WO 2012053601A1
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- engine
- electric motor
- rotational speed
- starting
- start control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/93—Conjoint control of different elements
Definitions
- the present invention relates to an engine start control device, a hybrid vehicle, an engine start method, and a program.
- a hybrid vehicle that has an engine and an electric motor and can be driven by the engine or the electric motor, or can run in cooperation with the engine and the electric motor can start the engine by the electric motor (see, for example, Patent Document 1). .
- the present invention is made under such a background, and an engine start control device capable of reducing power consumption when starting an engine with an electric motor and shortening a time required for starting the engine,
- An object of the present invention is to provide a hybrid vehicle, an engine starting method, and a program.
- the engine start control device of the present invention includes an engine and an electric motor, and can be driven by the engine or the electric motor, or can be driven in cooperation with the engine and the electric motor, and is a hybrid vehicle that starts the engine by the electric motor.
- the engine is raised to the first rotational speed by the electric motor, fuel is supplied to the engine that has reached the first rotational speed, and a further increase in the rotational speed of the engine is detected.
- the supply of electric power to the electric motor is temporarily stopped so that the fuel supply to the engine is interrupted and the electric motor is supplied to the electric motor when the rotational speed of the engine decreases to the second rotational speed. If a series of controls to restart the supply of power is repeated and a further increase in engine speed is detected,
- the rotational speed of the engine when no lowered to a second rotational speed is to determine the start of the engine is completed and ends the series of control.
- the engine start control device of the present invention can control the first rotation speed and the second rotation speed so as to change according to temperature information related to the engine.
- the engine start control device of the present invention can perform control so as to variably set the rotation speed and / or torque of the motor when starting the engine in response to temperature information related to the engine.
- the temperature information related to the engine is the engine coolant temperature.
- Another aspect of the present invention is a viewpoint as a hybrid vehicle.
- the hybrid vehicle of the present invention has the engine start control device of the present invention.
- Still another aspect of the present invention is an engine start method.
- the engine starting method of the present invention includes an engine and an electric motor, and can be driven by the engine or the electric motor, or the engine and the electric motor can be operated in cooperation, and the engine of the hybrid vehicle that starts the engine by the electric motor.
- a second step of detecting a further increase of the engine a third step of temporarily stopping the supply of electric power to the electric motor when a further increase of the engine speed is not detected by the processing of the second step, When the engine speed decreases to the second speed by the process of step 3, fuel is supplied to the engine.
- the further increase in the engine speed is detected by the process of the fourth step and the process of the second step, or the rotation of the engine by the process of the third step.
- a fifth step of determining that starting of the engine is completed when the speed has not decreased to the second rotational speed.
- Still another aspect of the present invention is a program characterized by causing an information processing device to realize the function of the engine start control device of the present invention.
- FIG. 1 is a block diagram showing an example of the configuration of the hybrid vehicle 1.
- the hybrid vehicle 1 is an example of a vehicle.
- the hybrid vehicle 1 is driven by an engine (internal combustion engine) 10 and / or an electric motor 13 via a transmission of a semi-automatic transmission, and the electric motor 13 can start the engine 10.
- the semi-automatic transmission is a transmission that can automatically perform a shifting operation while having the same configuration as a manual transmission.
- the hybrid vehicle 1 includes an engine 10, an engine ECU (Electronic Control Unit) 11, a clutch 12, an electric motor 13, an inverter 14, a battery 15, a transmission 16, a motor ECU 17, a hybrid ECU 18, wheels 19, a key switch 20, and a shift unit 21. It is configured.
- the transmission 16 has the above-described semi-automatic transmission and is operated by a shift unit 21 having a drive range (hereinafter referred to as a D (Drive) range).
- the engine 10 is an example of an internal combustion engine, and is controlled by the engine ECU 11 to rotate gasoline and light oil, CNG (Compressed Natural Gas), LPG (Liquefied ⁇ Petroleum Gas), or alternative fuel and the like to rotate the shaft internally. Power is generated and the generated power is transmitted to the clutch 12.
- CNG Compressed Natural Gas
- LPG Liquefied ⁇ Petroleum Gas
- the engine ECU 11 is a computer that operates in cooperation with the motor ECU 17 according to an instruction from the hybrid ECU 18 and controls the engine 10 such as a fuel injection amount and a valve timing.
- the engine ECU 11 includes a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), a microprocessor (microcomputer), a DSP (Digital Signal Processor), and the like. O (Input / Output) port and the like.
- the clutch 12 is controlled by the hybrid ECU 18 and transmits the shaft output from the engine 10 to the wheels 19 via the electric motor 13 and the transmission 16. That is, the clutch 12 mechanically connects the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 under the control of the hybrid ECU 18 to transmit the shaft output of the engine 10 to the electric motor 13, or By disconnecting the mechanical connection between the rotating shaft of the motor 10 and the rotating shaft of the electric motor 13, the shaft of the engine 10 and the rotating shaft of the electric motor 13 can be rotated at different rotational speeds.
- the clutch 12 causes the hybrid vehicle 1 to travel by the power of the engine 10, thereby causing the electric motor 13 to generate electric power, when the engine 10 is assisted by the driving force of the electric motor 13, and to start the engine 10 by the electric motor 13.
- the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 are mechanically connected.
- the clutch 12 is in a state where the engine 10 is stopped or idling and the hybrid vehicle 1 is running by the driving force of the electric motor 13 and when the engine 10 is stopped or idling and the hybrid vehicle 1 is decelerated.
- the electric motor 13 is generating electric power (regenerating electric power)
- the mechanical connection between the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 is disconnected.
- the clutch 12 is different from the clutch that is operated by the driver operating the clutch pedal, and operates under the control of the hybrid ECU 18.
- the electric motor 13 is a so-called motor generator.
- the electric power supplied from the inverter 14 generates motive power for rotating the shaft, and supplies the shaft output to the transmission 16 or the shaft supplied from the transmission 16. Electric power is generated by the rotating power, and the electric power is supplied to the inverter 14.
- the electric motor 13 When the hybrid vehicle 1 is accelerating or traveling at a constant speed, the electric motor 13 generates power for rotating the shaft, supplies the shaft output to the transmission 16, and cooperates with the engine 10.
- the hybrid vehicle 1 is driven to work. Further, for example, when the motor 13 is driven by the engine 10, or when the hybrid vehicle 1 is decelerating or traveling downhill, the motor 13 is traveling without power. Operates as a generator. In this case, power is generated by the power that rotates the shaft supplied from the transmission 16, and the electric power is supplied to the inverter 14 to charge the battery 15.
- the inverter 14 is controlled by the motor ECU 17 and converts the DC voltage from the battery 15 into an AC voltage or converts the AC voltage from the motor 13 into a DC voltage.
- the inverter 14 converts the DC voltage of the battery 15 into an AC voltage and supplies electric power to the electric motor 13.
- the inverter 14 converts the AC voltage from the electric motor 13 into a DC voltage. That is, in this case, the inverter 14 serves as a rectifier and a voltage regulator for supplying a DC voltage to the battery 15.
- the battery 15 is a chargeable / dischargeable secondary battery.
- the electric power is supplied to the electric motor 13 via the inverter 14 or when the electric motor 13 is generating electric power, It is charged by the power it generates.
- the transmission 16 has a semi-automatic transmission (not shown) that selects one of a plurality of gear ratios (speed ratios) in accordance with a speed change instruction signal from the hybrid ECU 18.
- the power and / or power of the electric motor 13 is transmitted to the wheel 19. Further, the transmission 16 transmits the power from the wheels 19 to the electric motor 13 when decelerating or traveling downhill.
- the driver can manually change the gear position to an arbitrary gear stage by operating the shift unit 21.
- the motor ECU 17 is a computer that operates in cooperation with the engine ECU 11 by following instructions from the hybrid ECU 18, and controls the electric motor 13 by controlling the inverter 14.
- the motor ECU 17 is configured by a CPU, an ASIC, a microprocessor (microcomputer), a DSP, and the like, and includes a calculation unit, a memory, an I / O port, and the like.
- the hybrid ECU 18 is an example of a computer, and acquires accelerator opening information, brake operation information, vehicle speed information, gear position information acquired from the transmission 16, and engine rotation speed information acquired from the engine ECU 11 for hybrid traveling. With reference to this, the clutch 12 is controlled, and the transmission 16 is controlled by supplying a shift instruction signal. Further, the hybrid ECU 18 gives a control instruction for the motor 13 and the inverter 14 to the motor ECU 17 based on the obtained SOC (State of Charge) information of the battery 15 and other information for the hybrid running, and the engine ECU 11 A control instruction for the engine 10 is given.
- the hybrid ECU 18 includes a CPU, an ASIC, a microprocessor (microcomputer), a DSP, and the like, and has an arithmetic unit, a memory, an I / O port, and the like.
- the program executed by the hybrid ECU 18 can be installed in advance in the hybrid ECU 18 that is a computer by storing the program in a nonvolatile memory inside the hybrid ECU 18 in advance.
- the engine ECU 11, the motor ECU 17, and the hybrid ECU 18 are CAN (Control Are connected to each other by a bus conforming to a standard such as Area Network.
- Wheel 19 is a driving wheel that transmits driving force to the road surface. Although only one wheel 19 is shown in FIG. 1, the hybrid vehicle 1 actually has a plurality of wheels 19.
- the key switch 20 is a switch that is turned on / off by a user, for example, when a key is started. When the key switch 20 is turned on, each part of the hybrid vehicle 1 is activated and the key switch 20 is turned off. Each part of the hybrid vehicle 1 is stopped by entering the state.
- FIG. 2 is a block diagram illustrating an example of a functional configuration realized in the hybrid ECU 18 that executes the program. That is, when the hybrid ECU 18 executes the program, the engine start control unit 30 is realized.
- the engine start control unit 30 inputs engine rotation speed information from the engine ECU 11 and outputs an electric motor control instruction to the motor ECU 17.
- the engine start control process performed in the hybrid ECU 18 that executes the program will be described with reference to the flowchart of FIG. Note that the engine start process is executed when the engine 10 is started when the key switch 20 is turned on at the start of operation of the hybrid vehicle 1 and when the hybrid vehicle 1 is already in operation, not shown.
- the engine 10 may be started when the idle stop condition is canceled under a situation where the engine is temporarily stopped by the idle stop function.
- step S1 is a state in which the hybrid ECU 18 executes a program and the engine start control unit 30 is realized in the hybrid ECU 18, and the procedure proceeds to step S1.
- step S1 the key switch 20 of the hybrid vehicle 1 at the start of operation is turned on, or the idle stop condition is canceled in the hybrid vehicle 1 that is already in operation and in idle stop, and the engine start control unit 30 recognizes this. Then, the procedure proceeds to step S2.
- step S2 the engine start control unit 30 connects the clutch 12 and proceeds to the procedure of step S3.
- step S3 the engine start control unit 30 instructs the motor ECU 17 to start the electric motor 13, and proceeds to the procedure of step S4.
- step S4 the engine start control unit 30 determines whether or not the engine 10 connected to the electric motor 13 by the clutch 12 is rotated by the torque of the electric motor 13 and the rotational speed is increased to a predetermined rotational speed R1. If it is determined in step S4 that the rotational speed of the engine 10 has increased to the rotational speed R1, the process proceeds to step S5. It is assumed that the torque of the electric motor 13 when starting the engine 10 is fixed to a predetermined value. This predetermined value is preferably set to a relatively high value assuming that the engine 10 is most difficult to start in winter, for example.
- step S5 the engine start control unit 30 instructs the motor ECU 17 so that the rotation speed of the electric motor 13 becomes a constant speed near the rotation speed R1, and proceeds to the procedure of step S6.
- step S6 the engine start control unit 30 instructs the engine ECU 11 to supply fuel to the engine 10 and proceeds to the procedure of step S7.
- step S7 the engine start control unit 30 determines whether or not the rotational speed of the engine 10 connected to the electric motor 13 by the clutch 12 is equal to or lower than the rotational speed R1. If it is determined in step S7 that the rotational speed of the engine 10 has become equal to or lower than the rotational speed R1, the process proceeds to step S8. On the other hand, if it is determined in step S7 that the rotational speed of the engine 10 has exceeded the rotational speed R1, it is determined that the engine 10 has been successfully started, and the process is terminated.
- step S8 the engine start control unit 30 stops the electric power supplied to the electric motor 13, and proceeds to the procedure of step S9.
- step S9 the engine start control unit 30 determines whether or not the rotational speed of the engine 10 connected to the electric motor 13 by the clutch 12 has decreased to a predetermined rotational speed R2 ( ⁇ R1). If it is determined in step S9 that the rotational speed of the engine 10 has decreased to the rotational speed R2, the process proceeds to step S10. On the other hand, if it is determined in step S9 that the rotation speed of the engine 10 does not decrease to the rotation speed R2, this means that the engine 10 has been successfully started as in the case of “No” in step S7. Exit.
- the rotational speed R2 is a rotational speed lower than the rotational speed R1, and for example, the ratio of the rotational speed R2 to the rotational speed R1 is determined in advance. That is, when the value of the rotational speed R1 is determined, the value of the rotational speed R2 is also determined accordingly.
- step S10 the engine start control unit 30 instructs the engine ECU 11 to shut off the supply of fuel to the engine 10, and proceeds to the procedure of step S11.
- step S11 the engine start control unit 30 resumes the supply of electric power to the electric motor 13, and returns to the procedure of step S3.
- step S3 the rotational speed of the engine 10 is also zero.
- step S4 the electric motor 13 is started, and the rotational speed of the engine 10 starts to increase accordingly.
- step S4 the rotational speed of the engine 10 continues to increase and reaches the rotational speed R1.
- step S5 the rotational speed of the electric motor 13 becomes a constant speed near the rotational speed R1, and the rotational speed of the engine 10 follows this.
- step S6 fuel is supplied to the engine 10.
- step S7 it is determined whether or not the rotational speed of the engine 10 is equal to or lower than the rotational speed R1. In this example, since the engine 10 has failed to start, the rotational speed of the engine 10 does not exceed the rotational speed R1.
- step S8 the electric power supplied to the electric motor 13 is stopped. As a result, the rotational speed of the electric motor 13 starts to decrease, and the rotational speed of the engine 10 also starts to decrease.
- step S9 the rotational speed of the engine 10 decreases to the rotational speed R2.
- step S11 the supply of electric power to the electric motor 13 is resumed, and the procedure returns to step S3.
- step S4 the rotational speed of the engine 10 continues to increase and reaches the rotational speed R1.
- step S5 the rotational speed of the electric motor 13 becomes a constant speed near the rotational speed R1, and the rotational speed of the engine 10 follows this.
- step S6 fuel is supplied to the engine 10.
- step S7 it is determined whether or not the rotational speed of the engine 10 is equal to or lower than the rotational speed R1. In this example, since the engine 10 has been successfully started, the rotational speed of the engine 10 exceeds the rotational speed R1. Thereby, the start of the engine 10 is completed (END).
- the hybrid vehicle 1 raises the engine 10 to the rotational speed R1 by the electric motor 13, supplies fuel to the engine 10 that has reached the rotational speed R1, detects a further increase in the rotational speed of the engine 10, and When no further increase in the rotational speed is detected, the supply of electric power to the electric motor 13 is temporarily stopped, and when the rotational speed of the engine 10 decreases to the rotational speed R2, the supply of fuel to the engine 10 is shut off, and the electric motor When the supply of electric power to 13 is resumed and a further increase in the rotational speed of the engine 10 is detected, or when the rotational speed of the engine 10 has not decreased to the rotational speed R2, it is determined that the engine 10 has been started. To do.
- FIG. 5 shows the motor rotation speed by the engine starting method according to the embodiment of the present invention with the passage of time in the upper part, and shows the motor rotation speed by the conventional engine starting method with the passage of time as a comparative example in the lower part.
- the rotational speed r of the electric motor 13 used for starting the engine 10 is larger (r> R1) than the embodiment of the present invention for the purpose of increasing the success probability of starting the engine.
- the time used for starting the engine 10 is longer than that of the embodiment of the present invention in order to increase the success probability of starting the engine (t> T).
- FIG. 6 shows the motor rotation speed by the engine starting method in the embodiment of the present invention in the uppermost stage with time, and the motor torque by the engine starting method in the embodiment of the present invention in the second stage from the top.
- the motor rotation speed by the conventional engine starting method is shown with the passage of time in the third stage from the top, and the motor torque by the conventional engine starting method is shown with the passage of time in the bottom stage.
- the torque tr of the electric motor 13 used for starting the engine 10 is large (tr> TR) as compared with the embodiment of the present invention for the purpose of increasing the success probability of starting the engine.
- the time t10 used to start the engine 10 is longer than the embodiment of the present invention for the purpose of increasing the success probability of starting the engine (t10> T10).
- FIG. 7 shows the motor rotation speed according to the engine starting method in the embodiment of the present invention in the uppermost stage with the lapse of time, and the motor output by the engine starting method in the embodiment of the present invention in the second stage from the top.
- the motor rotation speed by the conventional engine starting method is shown with the passage of time in the third stage from the top, and the motor output by the conventional engine starting method is shown with the passage of time at the bottom stage.
- the output p of the electric motor 13 used for starting the engine 10 is large (p> P) as compared with the embodiment of the present invention for the purpose of increasing the success probability of starting the engine.
- the time t10 used to start the engine 10 is longer than that of the embodiment of the present invention in order to increase the success probability of starting the engine (t10> T10).
- the engine starting method according to the embodiment of the present invention can reduce power consumption when starting the engine 10 by the electric motor 13 and shorten the time required for starting the engine 10 as compared with the conventional method.
- the hybrid vehicle 1 ⁇ / b> A can vary the rotation speeds R ⁇ b> 1 and R ⁇ b> 2 used for starting control of the engine 10 fixed in the engine starting control unit 30 of the hybrid vehicle 1 and the torque of the electric motor 13 based on the coolant temperature information of the radiator 22.
- the rotational speed R2 is a rotational speed lower than the rotational speed R1, and the ratio of the rotational speed R2 to the rotational speed R1 is determined in advance. Therefore, when the value of the rotational speed R1 is determined, the value of the rotational speed R2 is automatically determined.
- the values of the rotational speeds R1 and R2 are fixedly described, but in the second embodiment, the values of the rotational speeds R1 and R2 are variably set.
- the values of the rotational speeds R1 and R2 are varied according to the cooling water temperature of the radiator 22. In this case, when the coolant temperature shows a relatively high temperature, the engine 10 is in a state where it is easy to start, so the rotational speeds R1 and R2 are set to a low value. On the other hand, when the cooling water temperature indicates a relatively low temperature, the engine 10 is in a state that is difficult to start, so the rotational speeds R1 and R2 are set to a high value.
- the torque of the electric motor 13 when starting the engine 10 when the coolant temperature shows a relatively high temperature, the engine 10 is easy to start, so the torque is set to a low value.
- the cooling water temperature indicates a relatively low temperature, the engine 10 is in a state that is difficult to start, so the torque is set to a high value.
- FIG. 8 is a block diagram showing an example of the configuration of the hybrid vehicle 1A.
- the configuration of the hybrid vehicle 1A is partially different from the hybrid vehicle 1.
- the coolant temperature information of the radiator 22 can be received by the hybrid ECU 18A via the engine ECU 11A. Further, the hybrid ECU 18A performs control based on the operation information of the key switch 20. Since the other configuration of the hybrid vehicle 1A is the same as that of the hybrid vehicle 1, the description thereof is omitted.
- FIG. 9 is a block diagram illustrating an example of a configuration of functions realized in the hybrid ECU 18A that executes the program. That is, when the hybrid ECU 18A executes the program, the function of the engine start control unit 30A (engine start control device in the claims) is realized.
- the engine start control unit 30A is a function for instructing engine start control to the engine ECU 11, the clutch 12, and the electric motor ECU 17 based on key switch operation information and cooling water temperature information in addition to engine rotation speed information.
- the target starting rotational speed is the rotational speed of the electric motor 13 that is the target of the electric motor 13 when the electric motor 13 starts the engine 10.
- This target starting rotational speed corresponds to the rotational speed R1 referred to in the first embodiment.
- the target starting torque is the torque of the electric motor 13 targeted by the electric motor 13 when the engine 10 is started by the electric motor 13.
- the torque of the electric motor 13 is constant, but in the second embodiment, it is set to the target starting torque.
- FIG. 10 shows the cooling water temperature on the horizontal axis and the target starting rotational speed on the vertical axis.
- the horizontal axis represents the cooling water temperature
- the vertical axis represents the target starting torque.
- the comparative example (conventional) is indicated by a broken line.
- the engine 10 is most difficult to start (the cooling water temperature is the lowest), and the target starting rotational speed and the target starting torque are fixed to high values.
- the key switch 20 is in an ON state, the hybrid ECU 18A executes a program, and the function of the engine start control unit 30A is realized in the hybrid ECU 18A, and the procedure proceeds to step S20. .
- step S20 the engine start control unit 30A determines whether or not the coolant temperature information transmitted from the radiator 22 via the engine ECU 11A is detected. If it is determined in step S20 that the coolant temperature information has been detected, the procedure proceeds to step S21. On the other hand, if it is determined in step S20 that the coolant temperature has not been detected, the procedure repeats step S20.
- step S21 the engine start control unit 30A sets a target start rotation speed (that is, the rotation speed R1) and a target start torque corresponding to the coolant temperature detected in step S20, and the procedure proceeds to step S22.
- a target start rotation speed that is, the rotation speed R1
- a target start torque corresponding to the coolant temperature detected in step S20
- step S22 the engine start control unit 30A determines whether or not the key switch 20 has been operated to the start position of the engine 10. If it is determined in step S22 that the key switch 20 has been operated to the starting position of the engine 10, the procedure proceeds to step S23. On the other hand, if it is determined in step S22 that the key switch 20 has not been operated to the starting position of the engine 10, the procedure repeats step S22.
- step S23 the engine start control unit 30A starts the engine 10 by the electric motor 13 and ends the processing (END).
- the horizontal axis indicates the passage of time
- the vertical axis indicates the rotation speed of the motor 13.
- the solid line in FIG. 13 is the rotation speed of the electric motor 13 when the engine 10 is started by the control of the engine start control unit 30A
- the broken line is the rotation speed of the electric motor 13 when the conventional engine 10 as a comparative example is started.
- 13, 14, and 15 compare the comparative example (conventional) and the example of the present embodiment at the position of the one-dot chain line in the region where the cooling water temperature shown in FIGS. 10 and 11 is high. According to this, in the example of FIGS. 10 and 11, since the target starting rotational speed and the target starting torque are set lower than in the conventional case, as shown in FIG. 13, compared with the example of the present embodiment. Thus, it can be seen that, at the time of starting, the rotation speed is still higher.
- the horizontal axis represents time and the vertical axis represents the torque of the motor 13.
- the solid line in FIG. 14 is the torque of the electric motor 13 when starting the engine 10 under the control of the engine start control unit 30A, and the broken line is the torque of the electric motor 13 when starting the conventional engine 10 as a comparative example.
- the target starting rotational speed and the target starting torque are set lower than in the conventional case, so as shown in FIG. Thus, it can be seen that the torque is larger at the time of starting.
- the horizontal axis indicates the passage of time
- the vertical axis indicates the output of the motor 13.
- the solid line in FIG. 15 is the output of the electric motor 13 when starting the engine 10 under the control of the engine start control unit 30A
- the broken line is the output of the electric motor 13 when starting the conventional engine 10 as a comparative example.
- the target starting rotational speed and the target starting torque are set lower than in the conventional case, so as shown in FIG. 15, compared with the example of the present embodiment.
- the output is larger at the time of starting.
- the target starting rotational speed that is, the rotational speed R1
- the target starting torque of the electric motor 13 when starting the engine 10 are variably set according to the coolant temperature of the engine 10, the engine 10 Power consumption required for starting can be reduced.
- the power consumption when starting the engine 10 by the electric motor 13 can be reduced and the time required for starting the engine 10 can be shortened” in the first embodiment.
- the effects of “the power consumption required for starting the engine 10 can be reduced” in the second embodiment can be combined. Therefore, it is possible to realize the start control of the engine 10 that is suitable for the temperature environment before the engine 10 is started and that is efficient in terms of time and fuel consumption.
- the engine start control unit 30A detects the cooling water temperature of the radiator 22 and performs the start control. This is because the conventional vehicle is always equipped with a cooling water thermometer for the radiator 22 and it is most convenient to use this. However, if the hybrid vehicle 1A is equipped with other means for acquiring temperature information such as the temperature of the casing of the engine 10, the temperature of the engine room, or the temperature of the engine oil, the engine start control unit 30A may perform start control using either of these temperature information.
- the hybrid vehicle 1A is equipped with a clock function that can also display a calendar (year / month / day)
- the clock function can be used to determine the season (spring, summer, autumn, and winter).
- the target start rotational speed and the target start torque can be set appropriately to perform start control. Good.
- the driver may manually input the season information or time information.
- the engine start control unit 30A has been described as an example in which both the target start rotation speed and the target start torque of the electric motor 13 are set corresponding to the coolant temperature of the radiator 22. Either the target starting rotational speed or the target starting torque of the electric motor 13 may be set in accordance with the cooling water temperature.
- the rotation speed of the engine 10 can be reached by rotating the shaft of the engine 10 at what temperature condition and at what torque.
- Only the target starting torque of the electric motor 13 can be set corresponding to the cooling water temperature of the radiator 22 based on such experimental results.
- only the target starting rotational speed of the electric motor 13 is set corresponding to the coolant temperature of the radiator 22, and control is performed so that the torque of the electric motor 13 is gradually increased until the target starting rotational speed is reached at the actual start. If the control is finally performed so as to reach the target start rotational speed, the target start torque need not be set in advance.
- the program executed by the hybrid ECUs 18 and 18A has been described as being installed in advance in the hybrid ECUs 18 and 18A.
- a removable medium in which the programs are recorded (programs are stored) is connected to a drive (not shown).
- a communication unit (not shown) stores a program loaded and read from a removable medium in a nonvolatile memory inside the hybrid ECU 18, 18A, or transmitted via a wired or wireless transmission medium. And is stored in a non-volatile memory inside the hybrid ECU 18, 18A, so that the computer can be installed in the hybrid ECU 18, 18A.
- each ECU may be realized by an ECU in which these are combined into one, or an ECU that further subdivides the functions of each ECU may be provided.
- the program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.
- the boundary of the determination area may be variously changed such that “more than” is “exceeded” and “less than” is “less than”.
- the engine 10 has been described as an internal combustion engine, it may be a heat engine including an external combustion engine.
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Abstract
Description
以下、本発明の第一の実施の形態のハイブリッド自動車について、図1~図7を参照しながら説明する。
Area Network)などの規格に準拠したバスなどにより相互に接続されている。
ハイブリッド自動車1は、電動機13によりエンジン10を回転速度R1まで上昇させ、回転速度R1となったエンジン10に対して燃料を供給し、エンジン10の回転速度の更なる上昇を検出し、エンジン10の回転速度の更なる上昇が検出されないときには、電動機13への電力の供給を一時停止させ、エンジン10の回転速度が回転速度R2まで下がったときにエンジン10への燃料の供給を遮断すると共に、電動機13への電力の供給を再開し、エンジン10の回転速度の更なる上昇が検出されたとき、もしくはエンジン10の回転速度が回転速度R2まで下がらなかったときには、エンジン10の始動が完了したと判定する。
以下、本発明の第二の実施の形態のハイブリッド自動車1Aについて、図8~図15を参照しながら説明する。ハイブリッド自動車1Aは、ハイブリッド自動車1のエンジン始動制御部30において固定的に設定されていたエンジン10の始動制御に用いる回転速度R1,R2、および電動機13のトルクをラジエタ22の冷却水温情報に基づき可変するものである。なお、回転速度R2は、回転速度R1よりも低い回転速度であり、回転速度R1に対する回転速度R2の割合は予め定められている。よって、回転速度R1の値が定まると自動的に回転速度R2の値も定まることになる。
本発明の第二の実施の形態に係る効果を図13、図14、図15を参照して説明する。なお、図13、図14、図15に例示した状態は、第一の実施の形態の図3のフローチャートにおいて、ステップS7でNoとなり、エンジン10が最短時間で始動に成功した状態を例示している。
上述した第二の実施の形態では、エンジン始動制御部30Aは、ラジエタ22の冷却水温を検出して始動制御を実施した。これは従来から車両には、ラジエタ22の冷却水温計が必ず装備されているのでこれを利用することが最も好都合であるためである。しかしながら、この他にもエンジン10の筐体の温度やエンジンルームの気温、もしくはエンジンオイルの温度など、これらの温度情報を取得する手段がハイブリッド自動車1Aに装備されているならば、エンジン始動制御部30Aは、これらの温度情報のいずれかを用いて始動制御を実施してもよい。
Claims (7)
- エンジンと電動機とを有し、前記エンジンもしくは前記電動機により走行可能であり、または前記エンジンと前記電動機とが協働して走行可能であり、前記電動機により前記エンジンを始動させるハイブリッド自動車のエンジン始動制御装置において、
前記電動機により前記エンジンを第1の回転速度まで上昇させ、前記第1の回転速度となった前記エンジンに対して燃料を供給して前記エンジンの回転速度の更なる上昇を検出し、前記エンジンの回転速度の更なる上昇が検出されないときには、前記電動機への電力の供給を一時停止させて前記エンジンの回転速度が第2の回転速度まで下がったときに前記エンジンへの燃料の供給を遮断すると共に前記電動機への電力の供給を再開する一連の制御を繰り返し実行し、
前記エンジンの回転速度の更なる上昇が検出されたとき、もしくは前記エンジンの回転速度が前記第2の回転速度まで下がらなかったときには、前記エンジンの始動が完了したと判定して前記一連の制御を終了する、
ことを特徴とするエンジン始動制御装置。 - 請求項1記載のエンジン始動制御装置であって、
前記第1の回転速度および前記第2の回転速度を、前記エンジンに係る温度情報に応じて変更するように制御する、
ことを特徴とするエンジン始動制御装置。 - 請求項2記載のエンジン始動制御装置であって、
前記エンジンに係る温度情報に対応して前記エンジンを始動させる際の前記電動機の回転速度および/またはトルクを可変的に設定するように制御する、
ことを特徴とするエンジン始動制御装置。 - 請求項2または3記載のエンジン始動制御装置であって、
前記エンジンに係る温度情報は、前記エンジンの冷却水温である、
ことを特徴とするエンジン始動制御装置。 - 請求項1から4のいずれか1項記載のエンジン始動制御装置を有することを特徴とするハイブリッド自動車。
- エンジンと電動機とを有し、前記エンジンもしくは前記電動機により走行可能であり、または前記エンジンと前記電動機とが協働して走行可能であり、前記電動機により前記エンジンを始動させるハイブリッド自動車のエンジン始動方法において、
前記電動機により前記エンジンを第1の回転速度まで上昇させる第1のステップと、
前記第1のステップの処理により前記第1の回転速度となった前記エンジンに対して燃料を供給し、前記エンジンの回転速度の更なる上昇を検出する第2のステップと、
前記第2のステップの処理により前記エンジンの回転速度の更なる上昇が検出されないときには、前記電動機への電力の供給を一時停止させる第3のステップと、
前記第3のステップの処理により前記エンジンの回転速度が第2の回転速度まで下がったときに前記エンジンへの燃料の供給を遮断すると共に前記電動機への電力の供給を再開する第4のステップと、
前記第2のステップの処理により前記エンジンの回転速度の更なる上昇が検出されたとき、もしくは前記第3のステップの処理により前記エンジンの回転速度が前記第2の回転速度まで下がらなかったときには、前記エンジンの始動が完了したと判定する第5のステップと、
を有することを特徴とするエンジン始動方法。 - 情報処理装置に、請求項1から4のいずれか1項記載のエンジン始動制御装置の機能を実現させることを特徴とするプログラム。
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CN201180031848.5A CN102958772B (zh) | 2010-10-21 | 2011-10-20 | 发动机起动控制装置、混合动力汽车、发动机起动方法 |
US13/813,095 US8515608B2 (en) | 2010-10-21 | 2011-10-20 | Engine start control device, hybrid vehicle and engine start method, and computer program |
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