Control device for performing a start control

• US 10,322,715 B2
• Filed: 03/30/2016
• Issued: 06/18/2019
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Tsuda, Kohei, Yoshida, Takashi, Katagiri, Nao
• Primary Examiner(s): Badii, Behrang
• Assistant Examiner(s): Testardi, David A
• Application Number:
  US15/556,154
• Publication Number:
  US 20180037220A1
• Time in Patent Office: 1,175 Days
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/30 Control strategies involving selection of transmission gear ratio control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H
• CPC Class Codes: B60W 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2510/1025 Input torque
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/106 Rate of change
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 30/192 : Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: B60W 50/06 : Improving the dynamic response of the control system, e.g. improving the speed of regulation or avoiding hunting or overshoot
• CPC Class Codes: B60W 50/082 : Selecting or switching between different modes of propelling
• CPC Class Codes: F02N 11/0803 : characterised by means for initiating engine start or stop F02N11/0814 takes precedence
• CPC Class Codes: F16H 61/02 : characterised by the signals used for shift actuators F16H61/28, for continuously variable gearings F16H61/66
• CPC Class Codes: F16H 61/68 : specially adapted for stepped gearings
• CPC Class Codes: F16H 63/50 : Signals to an engine or motor
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

A control device that includes an electronic control unit that is configured to, in a case where a request to start the internal combustion engine is made while a downshift for changing a speed ratio of the speed change device so that the speed ratio after shifting is higher than the speed ratio before shifting is being performed in the electric drive state, perform the first start control after the downshift is completed.

Claims

1. A control device that controls a vehicle drive device in which an engagement device, a rotating electrical machine, and a speed change device are arranged in this order from an internal combustion engine side on a power transmission path connecting the internal combustion engine and wheels, wherein:

first start control is start control to start the internal combustion engine with output torque of the rotating electrical machine via the engagement device,

an electric drive state is a drive state where a vehicle is moved with the output torque of the rotating electrical machine with the engagement device being in a disengaged state, and

a torque ratio is a ratio of input torque that is input from a rotating electrical machine side of the power transmission path to the speed change device to output torque that is output from the speed change device toward a wheel side of the power transmission path, the control device comprising;

an electronic control unit that is configured to, in a case where a request to start the internal combustion engine is made while a downshift for changing a speed ratio of the speed change device so that the speed ratio after shifting is higher than the speed ratio before shifting is being performed in the electric drive state, perform the first start control after a change of a rotational speed of the rotating electrical machine that is caused by the output torque of the rotating electrical machine for the downshift is completed and during a period in which the torque ratio is changing due to the downshift.

2. The control device according to claim 1, wherein

in the case where the electronic control unit performs the first start control, the electronic control unit controls the engagement device so that transmission torque of the engagement device starts to increase during a period in which the torque ratio is changing due to the downshift.

3. The control device according to claim 2, wherein

second start control is start control to start the internal combustion engine with output torque of a starter motor, and

in the case where the request to start the internal combustion engine is made while the downshift is being performed in the electric drive state, the electronic control unit performs the second start control if a torque response request, which is a request for response to torque to be transmitted to the wheels, is a high response request state, and performs the first start control if the torque response request is a low response request state, which is a state where required response is lower than in the high response request state.

4. The control device according to claim 3, wherein

in the case where the request to start the internal combustion engine is made when the downshift is not being performed in the electric drive state, the electronic control unit starts the first start control if the torque response request is the low response request state, and starts the second start control if the torque response request is the high response request state.

5. The control device according to claim 1, wherein

the electronic control unit starts the first start control in a case where the request to start the internal combustion engine is made when the downshift is not being performed in the electric drive state.

6. The control device according to claim 5, wherein

second start control is start control to start the internal combustion engine with output torque of a starter motor, and

in the case where the request to start the internal combustion engine is made while the downshift is being performed in the electric drive state, the electronic control unit performs the second start control if a torque response request, which is a request for response to torque to be transmitted to the wheels, is a high response request state, and performs the first start control if the torque response request is a low response request state, which is a state where required response is lower than in the high response request state.

7. The control device according to claim 6, wherein

in the case where the request to start the internal combustion engine is made when the downshift is not being performed in the electric drive state, the electronic control unit starts the first start control if the torque response request is the low response request state, and starts the second start control if the torque response request is the high response request state.

8. The control device according to claim 1, wherein

second start control is start control to start the internal combustion engine with output torque of a starter motor, and

in the case where the request to start the internal combustion engine is made while the downshift is being performed in the electric drive state, the electronic control unit performs the second start control if a torque response request, which is a request for response to torque to be transmitted to the wheels, is a high response request state, and performs the first start control if the torque response request is a low response request state, which is a state where required response is lower than in the high response request state.

9. The control device according to claim 8, wherein

in the case where the request to start the internal combustion engine is made when the downshift is not being performed in the electric drive state, the electronic control unit starts the first start control if the torque response request is the low response request state, and starts the second start control if the torque response request is the high response request state.

10. The control device according to claim 1, wherein

the start of the first start control is a start of an increase in a transmission torque of the engagement device during a period in which the torque ratio is changing due to the downshift.