# US 2017/0254408 A1 · Hydraulic control apparatus

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- Number: US 2017/0254408 A1
- Document ID: US20170254408A1
- Status: Published application
- Kind: A1
- Application number: 15/438,681
- Filed: 2017-02-21
- Published: 2017-09-07
- Earliest claimed: 2016-03-03
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Yuichiro Takemori; Norihiro Akiyoshi
- Web page: https://patentgrep.com/patent/US20170254408A1

## CPC

- F16H 57/0446: {the supply forming part of the transmission control unit, e.g. for automatic transmissions}
- F16H 57/0435: {Pressure control for supplying lubricant; Circuits or valves therefor}
- F16H 57/0443: {for supply of lubricant during tilt or high acceleration, e.g. problems related to the tilt or extreme acceleration of the transmission casing and the supply of lubricant under these conditions}
- F16H 61/0025: {Supply of control fluid; Pumps therefor}
- F16H 61/0031: {using auxiliary pumps, e.g. pump driven by a different power source than the engine}
- F16H 61/0206: {Layout of electro-hydraulic control circuits, e.g. arrangement of valves}
- F16H 37/022: {the toothed gearing having orbital motion}
- F16H 47/065: {the mechanical gearing comprising gearing of the friction or endless flexible member type}
- F16H 59/18: dependent on the position of the accelerator pedal
- F16H 59/44: dependent on machine speed {, e.g. the vehicle speed} (F16H59/46 takes precedence)
- F16H 61/662: with endless flexible members
- F16H 2061/0037: {characterised by controlled fluid supply to lubrication circuits of the gearing}
- F16H: GEARING

## Abstract

A hydraulic control apparatus for a vehicle including a first flow path leading oil discharged from a first hydraulic pump to a driving unit, a second flow path leading oil discharged from a second hydraulic pump to a lubrication unit, a flow path switching unit switching a flow path, and a controller controlling the flow path switching unit so as to lead the oil discharged from the second hydraulic pump to the first flow path when inoperation of an accelerator is detected and vehicle speed less than or equal to a predetermined value which is greater than 0 is detected, and to lead the oil discharged from the second hydraulic pump to the lubrication unit when operation of the accelerator is detected or vehicle speed greater than the predetermined value is detected.

## Claims

### Claim 1

A hydraulic control apparatus for a vehicle, the vehicle comprising a prime mover and a power transmission mechanism, the power transmission mechanism comprising a driving unit driven by a hydraulic force and a lubrication unit to which a lubricating oil is supplied and being configured to transmit a torque output from the prime mover to a driving wheel in response to driving of the drive unit, the hydraulic control apparatus comprising:
a first hydraulic pump;
a second hydraulic pump;
a first flow path configured to lead an oil discharged from the first hydraulic pump to the driving unit;
a second flow path configured to lead an oil discharged from the second hydraulic pump to the lubrication unit;
a third flow path configured to lead the oil discharged from the second hydraulic pump to the first flow path;
a flow path switching unit configured to switch a flow path so as to lead the oil discharged from the second hydraulic pump to the lubrication unit through the second flow path or to the first flow path through the third flow path;
an operation detector configured to detect an operation or inoperation of an accelerator;
a vehicle speed detector configured to detect a vehicle speed; and
a controller configured to control the flow path switching unit so as to lead the oil discharged from the second hydraulic pump to the first flow path when the inoperation of the accelerator is detected by the operation detector and a vehicle speed less than or equal to a predetermined value which is greater than 0 is detected by the vehicle detector, and to lead the oil discharged from the second hydraulic pump to the lubrication unit when the operation of the accelerator is detected by the operation detector or a vehicle speed greater than the predetermined value is detected by the vehicle speed detector.

### Claim 2 (depends on 1)

The hydraulic control apparatus according to claim 1, wherein the power transmission mechanism comprises a transmission configured to output the torque input from the prime mover in response to driving of the drive unit while changing a rotation speed and, the transmission comprises a continuously variable transmission mechanism configured to transmit a torque through a power transmission member formed in an endless belt, and the driving unit comprises a pulley around which the power transmission member is wound and a width of a groove of the pulley is changeable.

### Claim 3 (depends on 1)

The hydraulic control apparatus according to claim 1, wherein the first and second hydraulic pumps are driven by the prime mover.

### Claim 4 (depends on 1)

The hydraulic control apparatus according to claim 1, further comprising an oil temperature detector configured to detect an oil temperature, wherein
the controller controls the flow path switching unit so as to lead the oil discharged from the second hydraulic pump to the first flow path when the oil temperature detected by the oil temperature detector is lower than or equal to a predetermined value even if the operation of the accelerator is detected by the operation detector or even if the vehicle speed greater than the predetermined value is detected by the vehicle speed detector.

### Claim 5 (depends on 1)

The hydraulic control apparatus according to claim 1, further comprising a kick-down determiner configured to determine if a kick-down command is output, wherein
The controller controls the flow path switching unit so as to lead the oil discharged from the second hydraulic pump to the first flow path when it is determined by the kick-down determiner that the kick-down command is output even if the operation of the accelerator is detected by the operation detector or even if the vehicle speed greater than the predetermined value is detected by the vehicle speed detector.

### Claim 6 (depends on 1)

The hydraulic control apparatus according to claim 1, wherein the flow path switching unit comprises a switching valve provided in the second flow path and configured to switch in response to a pilot pressure and a solenoid valve switched by a control signal output from the controller, and is configured so that an oil having passed through the first flow path is supplied to a pilot port of the switching valve in response to switching of the solenoid valve.

### Claim 7 (depends on 6)

The hydraulic control apparatus according to claim 6, wherein the flow path switching unit further comprises a check valve provided in the third flow path and configured to block flow of an oil from the first flow path to the second flow path and to allow flow of an oil from the second flow path to the first flow path when pressure in the third flow path is greater than or equal to a predetermined value.