CONTROL DEVICE

• US 20140207323A1
• Filed: 11/22/2012
• Published: 07/24/2014
• Est. Priority Date: 11/22/2011
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Yoshida, Takashi, Hakumura, Yomei, Tajima, Yoichi, Tsuda, Kohei
• Granted Patent: US 9,180,868 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• 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 2240/12 Speed
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2240/507 Operating parameters
• CPC Class Codes: B60L 2260/44 by parameter estimation
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• 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 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 2710/081 Speed
• 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
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

A control device that that performs starting control for an internal combustion engine. A first transition control during which a first engagement device is caused to transition from a disengaged state to a slipping engagement state is started after the starting request for the internal combustion engine is made. A rotational speed control in which the rotary electric machine is controlled such that a rotational speed of the rotary electric machine becomes a target rotational speed is started before the first engagement device transitions from the disengaged state to the slipping engagement state. A rotational speed control is terminated and torque control in which the rotary electric machine is controlled after the first engagement device transitions from the disengaged to the slipping engagement state, and the second engagement device is caused to transition from a direct engagement state to a slipping engagement state after the torque control is started.

Claims

1. A control device that controls a vehicle drive device in which a rotary electric machine is provided in a power transfer path that connects between an internal combustion engine and wheels and in which a first engagement device is provided between the internal combustion engine and the rotary electric machine and a second engagement device is provided between the rotary electric machine and the wheels, wherein

in performing starting control for the internal combustion engine in which a rotational speed of the internal combustion engine is raised using a rotational drive force of the rotary electric machine in the case where a starting request for the internal combustion engine is made with the first engagement device in a disengaged state and with the second engagement device in a direct engagement state,

first transition control in which the first engagement device is caused to transition from the disengaged state to a slipping engagement state is started after the starting request for the internal combustion engine is made, rotational speed control in which the rotary electric machine is controlled such that a rotational speed of the rotary electric machine becomes a target rotational speed is started before the first engagement device transitions from the disengaged state to the slipping engagement state, the rotational speed control is terminated and torque control in which the rotary electric machine is controlled such that output torque of the rotary electric machine becomes target torque is started after the first engagement device transitions from the disengaged state to the slipping engagement state, and the second engagement device is caused to transition from a direct engagement state to a slipping engagement state after the torque control is started.

2. The control device according to claim 1, wherein

the first engagement device is caused to transition from the slipping engagement state to a direct engagement state after the second engagement device transitions from the direct engagement state to the slipping engagement state.

3. The control device according to claim 1, wherein

second transition control in which the second engagement device is caused to transition from the direct engagement state to the slipping engagement state is started after the torque control is started.

4. The control device according to claim 1, wherein:

the disengaged state of the first engagement device is a state in which the first engagement device is not producing a transfer torque capacity;

the slipping engagement state of the first engagement device is a state in which there is a difference between the rotational speed of the internal combustion engine and the rotational speed of the rotary electric machine with the first engagement device producing a transfer torque capacity;

the direct engagement state of the first engagement device is a state in which there is no difference between the rotational speed of the internal combustion engine and the rotational speed of the rotary electric machine with the first engagement device producing a transfer torque capacity;

the slipping engagement state of the second engagement device is a state in which there is a difference between rotational speeds of two engagement members of the second engagement device with the second engagement device producing a transfer torque capacity; and

the direct engagement state of the second engagement device is a state in which there is no difference between the rotational speeds of the two engagement members of the second engagement device with the second engagement device producing a transfer torque capacity.

5. The control device according to claim 4, wherein:

the first transition control is started by providing the first engagement device with a command to produce a transfer torque capacity; and

the second transition control in which the second engagement device is caused to transition from the direct engagement state to the slipping engagement state is started by providing a command to gradually reduce the transfer torque capacity produced by the second engagement device until there is a difference between the rotational speeds of the two engagement members of the second engagement device.

6. The control device according to claim 1, wherein

after the second engagement device transitions from the direct engagement state to the slipping engagement state, the torque control is terminated, and slipping rotational speed control in which the output torque of the rotary electric machine is controlled so as to bring the rotational speed of the rotary electric machine closer to the target rotational speed which is higher than the rotational speed of the rotary electric machine for a case where the second engagement device is in the direct engagement state is started.

7. The control device according to claim 1, wherein

the second transition control in which the second engagement device is caused to transition from the direct engagement state to the slipping engagement state is started after transfer torque information that is information indicating that the transfer torque capacity of the first engagement device has become equal to or more than a predetermined value is detected.

8. The control device according to claim 7, wherein

information indicating that the rotational speed of the internal combustion engine has become equal to or more than a predetermined rotational speed is used as the transfer torque information.

9. The control device according to claim 1, wherein

the rotational speed control includes:

estimating transfer path input torque that is torque input to the power transfer path on the basis of variations in rotational speed of the rotary electric machine;

estimating external input torque input from the wheels to the power transfer path by subtracting at least the output torque of the rotary electric machine from the transfer path input torque; and

calculating the target rotational speed on the basis of the external input torque and vehicle required torque that is torque required to drive the wheels.

10. The control device according to claim 1, wherein

it is determined that the second engagement device has transitioned from the direct engagement state to the slipping engagement state on the basis of a fact that the rotational speed difference across the second engagement device has become equal to or more than a predetermined value.