# US 10,118,619 B2 · Vehicle control device and control method

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- Number: US 10,118,619 B2
- Document ID: US10118619B2
- Status: Granted
- Kind: B2
- Application number: 15/507,455
- Filed: 2015-08-27
- Published: 2017-10-26
- Granted: 2018-11-06
- Earliest claimed: 2014-08-29
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jodosha Kabushiki Kaisha
- Inventors: Kenji Matsuo; Akira Hino; Hiroki Kondo; Mitsuhiro Fukao; Daisuke Inoue; Atsushi Ayabe; Hiromitsu Nitani; Kazuya Sakamoto
- Web page: https://patentgrep.com/patent/US10118619B2

## CPC

- B60W 30/18018: {Start-stop drive, e.g. in a traffic jam}
- B60W 10/02: including control of driveline clutches
- B60W 10/06: including control of combustion engines
- B60W 10/30: including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
- F16H 61/0031: {using auxiliary pumps, e.g. pump driven by a different power source than the engine}
- F16H 61/2807: {using electric control signals for shift actuators, e.g. electro-hydraulic control therefor (F16H61/30, F16H61/32 take precedence)}
- B60W 2510/0208: Clutch engagement state, e.g. engaged or disengaged
- B60W 2510/0638: Engine speed
- B60W 2510/1005: Transmission ratio engaged
- B60W 2510/30: Auxiliary equipments
- B60W 2710/021: Clutch engagement state
- B60W 2710/06: Combustion engines, Gas turbines
- B60W 2710/30: Auxiliary equipments
- F16D 25/061: the clutch having interengaging clutch members
- F16D 25/14: {Fluid pressure control}
- F16D 2048/0233: {by rotary pump actuation}
- F16D 2048/0245: {Electrically driven rotary pumps}
- F16H 2061/047: {by preventing or solving a tooth butt situation upon engagement failure due to misalignment of teeth}
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- F16H: GEARING
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

In a control device for a vehicle including: a dog clutch mechanism that is disposed in a power transmission path in which a driving force is transmitted from an engine to a wheel and is operated by a hydraulic actuator; and an electric oil pump that supplies hydraulic pressure to the hydraulic actuator, rotation of the engine is stopped in a state in which the dog clutch mechanism is engaged by the hydraulic pressure supplied from the electric oil pump at a time during an engine stop operation, the rotation of the engine is started in the state in which the dog clutch mechanism is engaged by the hydraulic pressure supplied from the electric oil pump at a time during an engine restart operation, hence occurrence of up-lock of the dog clutch mechanism is prevented.

## Claims

### Claim 1

A vehicle control device comprising:
a power transmission path in which a driving force is transmitted from an engine to a wheel;
a dog clutch mechanism disposed in the power transmission path;
a hydraulic actuator operating the dog clutch mechanism;
an electric oil pump supplying hydraulic pressure to the hydraulic actuator; and
a controller
(a) driving the electric oil pump at a time during an engine stop operation, supplying the hydraulic pressure to the hydraulic actuator, engaging the dog clutch mechanism, and stopping rotation of the engine in a state in which the dog clutch mechanism is engaged, and
(b) driving the electric oil pump at a time during an engine restart operation, supplying the hydraulic pressure to the hydraulic actuator, engaging the dog clutch mechanism, and starting the rotation of the engine in the state in which the dog clutch mechanism is engaged.

### Claim 2 (depends on 1)

The vehicle control device according to claim 1 wherein
the vehicle includes a mechanical oil pump that is rotationally driven by the driving force of the engine,
the hydraulic actuator is supplied with the hydraulic pressure from the mechanical oil pump to operate the dog clutch mechanism, and
the electric oil pump supplies the hydraulic pressure compensating for a reduction of the hydraulic pressure supplied to the hydraulic actuator from the mechanical oil pump resulting from the engine stop operation, to the hydraulic actuator, so as to maintain the hydraulic actuator such that the dog clutch mechanism is engaged.

### Claim 3 (depends on 1)

The vehicle control device according to claim 1 wherein
the controller (a) stops the driving of the electric oil pump after the rotation of the engine is stopped (S3, S4), and (b) starts the driving of the electric oil pump before the rotation of the engine is started (S6, S7).

### Claim 4 (depends on 1)

The vehicle control device according to claim 1 wherein
the power transmission path includes: a first power transmission path in which the driving force from the engine is transmitted to a wheel via a continuously variable transmission; a second power transmission path in which the driving force is transmitted to the wheel at the time of a vehicle start via a starting gear mechanism without using the first power transmission path; and a clutch that alternatively switches between the first power transmission path and the second power transmission path, and the dog clutch mechanism is the clutch disposed in the second power transmission path.

### Claim 5

A control method for a vehicle including a dog clutch mechanism disposed in a power transmission path in which a driving force is transmitted from an engine to a wheel and operated by a hydraulic actuator and an electric oil pump supplying hydraulic pressure to the hydraulic actuator, the control method comprising:
(a) driving the electric oil pump at a time during an engine stop operation, supplying the hydraulic pressure to the hydraulic actuator, engaging the dog clutch mechanism, and stopping rotation of the engine in a state in which the dog clutch mechanism is engaged; and
(b) driving the electric oil pump at a time during an engine restart operation, supplying the hydraulic pressure to the hydraulic actuator, engaging the dog clutch mechanism, and starting the rotation of the engine in the state in which the dog clutch mechanism is engaged.