CONTROL DEVICE

• US 20120078457A1
• Filed: 09/22/2011
• Published: 03/29/2012
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: TAJIMA, Yoichi, HAKUMURA, Yomei, YOSHIDA, Takashi
• Granted Patent: US 8,498,765 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• 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 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• 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 2240/14 Acceleration
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/425 Temperature
• 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 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/0061 relating to electrical machines
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/12 : responding to state of charge [SoC]
• CPC Class Codes: B60L 58/15 : Preventing overcharging
• CPC Class Codes: B60L 58/24 : for controlling the temperature of batteries
• CPC Class Codes: B60L 58/25 : by controlling the electric load
• CPC Class Codes: B60L 7/18 : Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• 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 20/00 : Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2510/1015 : Input shaft speed, e.g. turbine speed
• CPC Class Codes: B60W 2710/0666 : Engine torque
• CPC Class Codes: B60W 2710/081 : Speed
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 2710/086 : Power
• CPC Class Codes: F02D 29/02 : peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
• 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 configured with a first control portion controls an engagement pressure of a first engagement device to make a rotational speed of the input member equal to a predetermined rotational speed during the specific electric power generation control. A second control portion controls an engagement pressure of the second engagement device in such a manner as to make a transfer torque capacity of the second engagement device equal to a predetermined transfer torque capacity during the specific electric power generation control. Another control portion determines a target rotational speed in such a manner as to maintain a state in which an electric power generation amount achieved by the rotating electrical machine coincides with a predetermined target electric power generation amount, in accordance with a magnitude of a differential torque as a difference between a torque transmitted via the first engagement device.

Claims

1. A control device designed to control a vehicular drive device that has a rotating electrical machine provided in a drive train path connecting an input member drivingly coupled to an internal combustion engine with an output member drivingly coupled to wheels, has a first engagement device provided between the input member and the rotating electrical machine, and has a second engagement device provided between the rotating electrical machine and the output member, the control device being structured to be able to perform specific electric power generation control for causing the rotating electrical machine to carry out electric power generation when both the first engagement device and the second engagement device are in a slip engagement state, and the control device comprising:

a first engagement device operation control portion that controls an engagement pressure of the first engagement device in such a manner as to make a rotational speed of the input member equal to a predetermined rotational speed during the specific electric power generation control;

a second engagement device operation control portion that controls an engagement pressure of the second engagement device in such a manner as to make a transfer torque capacity of the second engagement device equal to a predetermined transfer torque capacity during the specific electric power generation control; and

a rotating electrical machine control portion that determines a target rotational speed in such a manner as to maintain a state in which an electric power generation amount achieved by the rotating electrical machine coincides with a predetermined target electric power generation amount, in accordance with a magnitude of a differential torque as a difference between a torque transmitted via the first engagement device and a torque transmitted via the second engagement device, in performing rotational speed control for causing a rotational speed of the rotating electrical machine to follow the target rotational speed by issuing a command of the target rotational speed to the rotating electrical machine during the specific electric power generation control.

2. The control device according to claim 1, further comprising:

a provisional target torque determination portion that determines a provisional target torque to be output by the rotating electrical machine on a basis of the target electric power generation amount and a preset provisional target rotational speed of the rotating electrical machine, and

an internal combustion engine torque command generation portion that generates an internal combustion engine torque command as such a command as to make an output torque of the internal combustion engine coincide with a sum of a required torque needed to cause a vehicle to run and an absolute value of the provisional target torque during the specific electric power generation control.

3. The control device according to claim 2, wherein the provisional target rotational speed is set to a value within such a rotational speed range that a heat generation amount of the rotating electrical machine per unit time becomes equal to or smaller than a predetermined value set in advance.

4. The control device according to claim 1, wherein the rotating electrical machine control portion determines the target rotational speed through feedback control based on a deviation of an actual electric power generation amount achieved by the rotating electrical machine from the target electric power generation amount.

5. The control device according to claim 1, wherein the rotating electrical machine control portion determines the target rotational speed corresponding to the magnitude of the differential torque and the target electric power generation amount on a basis of a map or relational expression prescribing a relationship among the magnitude of the differential torque, the target electric power generation amount, and the target rotational speed.

6. The control device according to claim 1, wherein the specific electric power generation control is performed at least in a low-vehicle-speed charge requirement state in which a storage amount of a storage device is equal to or smaller than a predetermined charge requirement criterial threshold and a rotational speed of the output member is equal to or lower than a predetermined low vehicle speed criterial threshold determined on a basis of a preset provisional target rotational speed of the rotating electrical machine.

7. The control device according to claim 1, wherein the specific electric power generation control is performed at least in a low temperature state in which a temperature of a storage device is equal to or lower than a predetermined low temperature criterial threshold set on a basis of an internal resistance of the storage device.

8. The control device according to claim 1, wherein the target electric power generation amount is set on a basis of at least one of a storage amount of a storage device and an electric power consumption by an auxiliary installed in a vehicle.