Hybrid vehicle

Abstract

To more appropriately perform system activation and engine start based on an engine-on signal.SOLUTION: A main control device, upon receiving an engine-on signal from an ignition switch, determines whether or not engine start is permitted, then selects a cranking device, outputs the engine-on signal to a motor control device when cranking is performed by a motor, and cranks the engine by a starter when cranking is performed by the starter.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to hybrid vehicles. [Background technology]

[0002] Conventionally, a hybrid vehicle of this type has been proposed that includes an engine, a starter that cranks the engine, an engine control device that controls the engine, a motor connected to the output shaft of the engine via a clutch, a motor control device that drives and controls the motor, and a main control device that transmits drive control signals to the engine control device and the motor control device (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-092527 Summary of the Invention [Problem to be solved by the invention]

[0004] In the hybrid vehicle described above, normally, when the engine is turned on, the main control device immediately cranks the engine using the starter and outputs a system start signal to the motor control device, but this causes a delay in the system start notification from the motor drive system, resulting in cases where the engine start cannot be stopped.

[0005] The main object of the hybrid vehicle of the present disclosure is to more appropriately perform system startup and engine start based on an ignition-on signal. [Means for solving the problem]

[0006] The hybrid vehicle of the present disclosure employs the following measures to achieve the above-mentioned main object.

[0007] The hybrid vehicle of the present disclosure is A hybrid vehicle comprising an engine, a starter for cranking the engine, a low voltage system connected to a low voltage battery to supply power to the starter, a motor connected to an output shaft of the engine, a high voltage system connected to a high voltage battery having a higher voltage than the low voltage battery to supply power to the motor, a motor control device for controlling the driving of the motor, and a main control device for receiving a signal from an ignition switch and cranking the engine by the starter or the motor, When the main control device receives an engine-on signal from the ignition switch, the main control device judges whether or not the engine can be started, and then selects a cranking device, and outputs the engine-on signal to the motor control device when cranking is to be performed by the motor or the starter, and cranks the engine by the starter when cranking is to be performed by the starter. It is characterized by:

[0008] The hybrid vehicle disclosed herein includes an engine, a starter for cranking the engine, a low-voltage system connected to a low-voltage battery and supplying power to the starter, a motor connected to an output shaft of the engine, a high-voltage system connected to a high-voltage battery having a higher voltage than the low-voltage battery and supplying power to the motor, a motor control device for driving and controlling the motor, and a main control device for cranking the engine by the starter or the motor upon receiving a signal from an ignition switch. When an engine-on signal is received from the ignition switch, the main control device determines whether the engine can be started, and then selects a cranking device. If the engine is to be cranked by the motor or the starter, the main control device outputs an engine-on signal to the motor control device, and if the engine is to be cranked by the starter, the main control device cranks the engine by the starter. If the engine is not to be started, the main control device does not output a starter-on signal to either the starter or the motor. This allows the system to be started and the engine to be started more appropriately based on the engine-on signal and the system state when the engine is turned on. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing an outline of the configuration of a hybrid vehicle 20 according to an embodiment of the present invention. [Diagram 2] 11 is a flowchart showing an example of a system startup process executed by the main EUC 70. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Next, a mode (embodiment) for carrying out the present invention will be described. Fig. 1 is a schematic diagram showing the configuration of a hybrid vehicle 20 as one embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22, a starter 25, a motor 30, an inverter 32, an automatic transmission 40, a high-voltage battery 60, a low-voltage battery 67, a DC / DC converter 68, and a main electronic control unit (hereinafter referred to as "main ECU") 70.

[0011] The engine 22 is configured as a multi-cylinder (4-cylinder, 6-cylinder, etc.) internal combustion engine that uses gasoline, diesel, etc. supplied from a fuel tank via a fuel supply system as fuel and outputs power through each of the intake, compression, expansion (explosive combustion), and exhaust strokes. The operation of the engine 22 is controlled by an engine electronic control unit (hereinafter referred to as "engine ECU") 24.

[0012] Although not shown, the engine ECU 24 is configured as a microprocessor centered on a CPU, and in addition to the CPU, includes a ROM for storing processing programs, a RAM for temporarily storing data, an input / output port, and a communication port. Signals from various sensors required for controlling the operation of the engine 22 are input to the engine ECU 24 via input ports, and various control signals for controlling the operation of the engine 22 are output from the engine ECU 24 via output ports.

[0013] A starter 25 for cranking the engine 22 is connected to the crankshaft 23 serving as the output shaft of the engine 22. In addition, the input side of a damper 28 serving as a torsion element is also connected to the crankshaft 23 of the engine 22. A pulley 23b is attached to the crankshaft 23 of the engine 22.

[0014] The motor 30 is configured as, for example, a synchronous generator motor. A pulley 30b is attached to a rotating shaft of the motor 30. A belt 31 is looped around the pulley 30b so as to rotate and drive a pulley 23b attached to the crankshaft 23 of the engine 22. The inverter 32 is used to drive the motor 30 and is connected to a high-voltage power line 61. The motor 30 is driven and controlled by a motor electronic control unit (hereinafter referred to as "motor ECU") 34. The motor 30 is driven and rotated by the motor ECU 34 controlling the switching of multiple switching elements of the inverter 32.

[0015] Although not shown, the motor ECU 34 is configured as a microprocessor centered on a CPU, and in addition to the CPU, includes a ROM for storing processing programs, a RAM for temporarily storing data, an input / output port, and a communication port. The rotational position of the rotor of the motor 30, the phase current of the three-phase AC power applied to the motor 30, and the like are input to the motor ECU 34 via an input port. In addition, the motor ECU 34 outputs a switching control signal for controlling the drive of the motor 30 to the inverter 32, a switching control signal to the DC / DC converter 68, and the like via an output port.

[0016] The automatic transmission 40 includes a torque converter 43, a six-speed automatic transmission 45, and a hydraulic circuit (not shown). The torque converter 43 is configured as a general fluid-type transmission device, and amplifies the torque of the input shaft 41 connected to the rotating shaft of the motor 30 and transmits it to the intermediate rotating shaft 44, which is the input shaft of the automatic transmission 45, or transmits it without amplifying the torque. The automatic transmission 45 is connected to the output shaft 42, which is connected to the intermediate rotating shaft 44 and the drive shaft 46, and has a plurality of planetary gears and a plurality of hydraulically driven friction engagement elements (clutches, brakes). The drive shaft 46 is connected to the rear wheels 55a, 55b via an axle 56 and a rear differential gear 57. The automatic transmission 45 transmits power between the intermediate rotating shaft 44 and the output shaft 42, forming forward gears from 1st gear to 6th gear and reverse gears by engaging and disengaging the plurality of friction engagement elements, for example.

[0017] High-voltage battery 60 is, for example, a lithium-ion battery or a nickel-metal hydride battery, and is connected to high-voltage power line 61 that is connected to inverter 32. Low-voltage battery 67 is, for example, a lead battery having a lower rated voltage than high-voltage battery 60, and is connected to low-voltage power line 66 that is connected to starter 25. DC / DC converter 68 is connected to high-voltage power line 61 and low-voltage power line 66. DC / DC converter 68 is controlled by main ECU 70 to step down the power of high-voltage power line 61 and supply it to low-voltage power line 66. Hereinafter, the voltage system of high-voltage power line 61 may be referred to as a high-voltage system, and the voltage system of low-voltage power line 66 may be referred to as a low-voltage system.

[0018] Although not shown, the main ECU 70 is configured as a microprocessor centered on a CPU, and in addition to the CPU, includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port. Signals from various sensors are input to the main ECU 70 via the input port. Examples of signals input to the main ECU 70 include a rotational position φm of the rotor of the motor 30 from a rotational position sensor (not shown) that detects the rotational position of the rotor of the motor 30, and a rotational speed Np of the drive shaft 46 from a rotational speed sensor 46a attached to the drive shaft 46. In addition, examples of signals input to the main ECU 70 include a battery temperature Tb from a temperature sensor 60a attached to the high-voltage battery 60, a voltage Vh of the high-voltage battery 60 from a voltage sensor (not shown) attached between the terminals of the high-voltage battery 60, a current Ih of the high-voltage battery 60 from a current sensor (not shown) attached to the output terminal of the high-voltage battery 60, and a voltage Vb of the low-voltage battery 67 from a voltage sensor (not shown) attached between the terminals of the low-voltage battery 67. Further examples include an ignition signal IG from an ignition switch 80, a shift position SP from a shift position sensor 82 that detects the operating position of a shift lever 81, an accelerator opening Acc from an accelerator pedal position sensor 84 that detects the amount of depression of an accelerator pedal 83, and a brake pedal position BP from a brake pedal position sensor 86 that detects the amount of depression of a brake pedal 85.

[0019] Various control signals are output from the main ECU 70 via an output port. Examples of signals output from the main ECU 70 include a start signal to the starter 25, a control signal to the inverter 32, and a control signal to the automatic transmission 40. The main ECU 70 is connected to the engine ECU 24 and the motor ECU 34 via communication ports.

[0020] Next, the operation of the hybrid vehicle 20 of the embodiment thus configured, particularly the operation when the ignition switch 80 is operated to turn on the ignition signal IG, will be described. Fig. 2 is a flowchart showing an example of a system startup process executed by the main ECU 70 and the motor ECU 34. In Fig. 2, the left side of the central dashed line is the process of the main ECU 70, and the right side of the central dashed line is the process of the motor ECU 34.

[0021] When the system startup process is executed, the main ECU 70 first waits until the ignition signal IG is turned on (step S100), and then transmits an ignition on signal (IG on signal) to the motor ECU 34 (step S110).

[0022] When the motor ECU 34 receives the IG on signal from the main ECU 70, it starts up the drive system of the motor 30 (step S120), and when the system start-up is completed, it transmits a system start-up completion signal for the motor drive system to the main ECU 70 (step S130). The system start-up of the motor drive system includes, for example, turning on a system main relay (not shown) that is attached to the high-voltage side power line 61 and connects and disconnects the high-voltage battery 60.

[0023] When the main ECU 70 receives the system startup completion signal of the motor drive system from the motor ECU 34, it starts cranking by the starter 25 (step S140), starts the engine 22 (step S150), and ends this process.

[0024] In the configuration diagram of Figure 1, a thick dashed dotted line shows a process (flow) in which an IG ON signal from the ignition switch 80 is sent to the motor ECU 34 via the main ECU 70, a system start-up completion signal for the motor drive system is sent from the motor ECU 34 to the main ECU 70, and upon receipt of this system start-up completion signal, the main ECU 70 starts cranking using the starter 25. Note that a starting block 72 in the main ECU 70 in Figure 1 is a functional block for starting the starter 25.

[0025] In the hybrid vehicle 20 of the embodiment described above, when the ignition signal IG is turned on, the main ECU 70 transmits an IG-on signal to the motor ECU 34. The motor ECU 34, which has received the IG-on signal, starts the motor drive system, and transmits a system start-up completion signal for the motor drive system to the main ECU 70. The main ECU 70, which has received the system start-up completion signal for the motor drive system, starts cranking by the starter 25 to start the engine 22. Through this process, the engine 22 can be started by cranking by the starter 25 after the system start-up of the motor drive system. As a result, the system start-up of the motor drive system and the start of the engine 22 based on the IG-on signal can be performed more appropriately.

[0026] The above describes the form for carrying out the present invention using an embodiment, but the present invention is not limited to such an embodiment in any way, and it goes without saying that the present invention can be carried out in various forms without departing from the gist of the present invention. [Industrial Applicability]

[0027] The present invention can be used in the hybrid vehicle manufacturing industry and the like. [Explanation of symbols]

[0028] 20 hybrid vehicle, 22 engine, 23 crankshaft, 24 engine ECU, 25 starter, 30 motor, 32 inverter, 34 motor electronic control unit (motor ECU), 40 automatic transmission, 46 drive shaft, 60 high voltage battery, 61 high voltage power line, 66 low voltage power line, 67 low voltage battery, 68 DC / DC converter, 70 main electronic control unit (main ECU), 80 ignition switch, 81 shift lever, 82 shift position sensor.

Claims

[Claim 1] A hybrid vehicle comprising: an engine; a starter for cranking the engine; a low voltage system connected to a low voltage battery to supply power to the starter; a motor coupled to an output shaft of the engine; a high voltage system connected to a high voltage battery having a higher voltage than the low voltage battery to supply power to the motor; a motor control device for controlling the drive of the motor; and a main control device for receiving a signal from an ignition switch and cranking the engine using the starter, When the main control device receives an engine-on signal from the ignition switch, the main control device judges whether or not the engine can be started, and then selects a cranking device, and outputs the engine-on signal to the motor control device when cranking is to be performed by the motor or the starter, and cranks the engine by the starter when cranking is to be performed by the starter. A hybrid vehicle characterized by

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