# US 10,371,253 B2 · Power transmission control device, and power transmission or vehicle including the same

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- Number: US 10,371,253 B2
- Document ID: US10371253B2
- Status: Granted
- Kind: B2
- Application number: 15/913,930
- Filed: 2018-03-07
- Published: 2018-09-20
- Granted: 2019-08-06
- Earliest claimed: 2017-03-15
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co.,Ltd.
- Inventors: Yuya Tachibanada; Yutaka Ishikawa
- Web page: https://patentgrep.com/patent/US10371253B2

## CPC

- F16H 61/0021: {Generation or control of line pressure}
- F16H 59/72: dependent on oil characteristics, e.g. temperature, viscosity
- F16H 61/0206: {Layout of electro-hydraulic control circuits, e.g. arrangement of valves}
- F16H 63/3483: {with hydraulic actuating means}
- F16H 59/74: Inputs being a function of engine parameters (F16H59/14 takes precedence)
- F16H 2059/746: {Engine running state, e.g. on-off of ignition switch}
- F16H 2061/0034: {Accumulators for fluid pressure supply; Control thereof}
- F16H 2312/14: Going to, or coming from standby operation, e.g. for engine start-stop operation at traffic lights
- F16H: GEARING

## Abstract

A power transmission includes a first brake, a pressure regulating valve, an accumulator, an oil temperature sensor, a second electromagnetic valve allowing supply of working oil to a piston, and a power transmission control device. The power transmission control device includes a memory relating and storing a working oil temperature and a permission time configured to allow release of the accumulator, and a receiver unit receiving a starting request. The accumulator is connected such that the working oil, in which the pressure is accumulated, can be supplied to the first brake and the piston. The power transmission control device sets a permission time corresponding to a temperature of the working oil on the basis of the memory. The working oil, in which the pressure is accumulated, is supplied to the first brake only during the permission time when restart information is received, while a vehicle performs idling stop control.

## Claims

### Claim 1

A power transmission control device configured to control a power transmission, the power transmission comprising:
an engaging mechanism that is fastened upon departure of a vehicle;
a pressure regulating valve configured to regulate a pressure of a working fluid for the engaging mechanism;
a pressure accumulator configured to accumulate a pressure in the working fluid;
a temperature detecting unit configured to detect a temperature of the working fluid;
a parking piston configured to switch between locking and unlocking of a parking lock mechanism; and
an opening/closing valve configured to allow supply of the working fluid to the parking piston to switch the parking piston to a locked side,
wherein the power transmission control device comprising:
a storage unit configured to relate and store a temperature of the working fluid and a permission time in which release of the pressure accumulator is allowed; and
a receiver unit configured to receive restart information of a prime mover mounted on the vehicle,
wherein the vehicle is able to execute idling stop control that stops the prime mover upon halting,
the pressure accumulator is connected to supply the working fluid, in which the pressure is accumulated, for the engaging mechanism and the parking piston, and
the power transmission control device sets the permission time corresponding to the temperature of the working fluid detected by the temperature detecting unit on the basis of memory in the storage unit, and
the working fluid, in which the pressure is accumulated by the pressure accumulator, is supplied to the engaging mechanism only during the permission time when restart information of the prime mover is received, while the vehicle performs the idling stop control.

### Claim 2 (depends on 1)

The power transmission control device according to claim 1, wherein, when the temperature detected by the temperature detecting unit is a predetermined upper limit temperature or more, even if the restart information of the prime mover is received, supply of the working fluid, in which the pressure is accumulated by the pressure accumulator, for the engaging mechanism is prohibited.

### Claim 3 (depends on 1)

A power transmission comprising: the power transmission control device according to claim 1, the engaging mechanism that is fastened upon departure of the vehicle, the pressure regulating valve configured to regulate a pressure in the working fluid for the engaging mechanism, the pressure accumulator configured to accumulate a pressure in the working fluid, and the temperature detecting unit configured to detect a temperature of the working fluid.

### Claim 4 (depends on 3)

A vehicle comprising the power transmission according to claim 3, the prime mover configured to transmit power to the power transmission, and a drive wheel to which power output from the power transmission is transmitted.

### Claim 5 (depends on 2)

A power transmission comprising: the power transmission control device according to claim 2, the engaging mechanism that is fastened upon departure of the vehicle, the pressure regulating valve configured to regulate a pressure in the working fluid for the engaging mechanism, the pressure accumulator configured to accumulate a pressure in the working fluid, and the temperature detecting unit configured to detect a temperature of the working fluid.

### Claim 6 (depends on 5)

A vehicle comprising the power transmission according to claim 5, the prime mover configured to transmit power to the power transmission, and a drive wheel to which power output from the power transmission is transmitted.