Vehicle control device and vehicle control method

Patent metadata

Field	Value
Publication number	US-9841069-B2
Application number	US-201414778518-A
Country	US
Kind code	B2
Filing date	Feb 12, 2014
Priority date	Mar 21, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A vehicle control device for controlling a vehicle with a frictional engagement element provided between a drive source and drive wheels includes a first determination unit configured to determine whether or not a signal of an inhibitor switch indicates a traveling position, a second determination unit configured to determine whether or not an oil path communicating with the frictional engagement element is in a drain state, a temperature estimation unit configured to estimate temperature of the frictional engagement element, and a temperature estimation prohibition unit configured to prohibit temperature estimation of the frictional engagement element by the temperature estimation unit when the signal of the inhibitor switch indicates the traveling position and the oil path is in the drain state.

First claim

The invention claimed is:

1. A vehicle control device for controlling a vehicle with a frictional engagement element provided between a drive source and drive wheels, the frictional engagement element being engaged when a signal from an inhibitor switch indicates a traveling position and being in a released state when an oil path communicating with the frictional engagement element is in a drain state, comprising:
a first determination unit configured to determine whether the signal of the inhibitor switch indicates the traveling position;
a second determination unit configured to determine whether the oil path communicating with the frictional engagement element is in the drain state;
a temperature estimation unit configured to estimate temperature of the frictional engagement element; and
a temperature estimation prohibition unit configured to prohibit temperature estimation of the frictional engagement element by the temperature estimation unit when the signal of the inhibitor switch indicates the traveling position and the oil path is in the drain state.

2. The vehicle control device according to claim 1 , comprising:
a protection control unit configured to execute a protection control for protecting the frictional engagement element when the estimated temperature of the frictional engagement element estimated by the temperature estimation unit is higher than a predetermined temperature,
wherein the temperature estimation prohibition unit is configured to prohibit the temperature estimation of the frictional engagement element by the temperature estimation unit when the signal of the inhibitor switch indicates the traveling position, the oil path is in the drain state and the estimated temperature of the frictional engagement element is higher than the predetermined temperature.

3. The vehicle control device according to claim 1 , wherein:
the frictional engagement element is a starting frictional engagement element to be slipped when the vehicle starts.

4. A vehicle control method for controlling a vehicle with a frictional engagement element provided between a drive source and drive wheels, the frictional engagement element being engaged when a signal from an inhibitor switch indicates a traveling position and being in a released state when an oil path communicating with the frictional engagement element is in a drain state, comprising:
determining whether the signal of the inhibitor switch indicates the traveling position;
determining whether the oil path communicating with the frictional engagement element is in the drain state;
estimating temperature of the frictional engagement element; and
prohibiting temperature estimation of the frictional engagement element when the signal of the inhibitor switch indicates the traveling position and the oil path is in the drain state.

5. A vehicle control device for controlling a vehicle with a frictional engagement element provided between a drive source and drive wheels, the frictional engagement element being engaged when a signal from an inhibitor switch indicates a traveling position and being in a released state when an oil path communicating with the frictional engagement element is in a drain state, comprising:
first determination means for determining whether the signal of the inhibitor switch indicates the traveling position;
second determination means for determining whether the oil path communicating with the frictional engagement element is in the drain state;
temperature estimation means for estimating temperature of the frictional engagement element; and
temperature estimation prohibition means for prohibiting temperature estimation of the frictional engagement element by the temperature estimation means when the signal of the inhibitor switch indicates the traveling position and the oil path is in the drain state.

Assignees

• Jatco Ltd
• Nissan Motor

Inventors

• Kotsuji Kouichi

Classifications

• F16D2500/30404

  Clutch temperature · CPC title

• F16D2500/3053

  On/off signal indicating the presence of cooling oil flow · CPC title

• B60W2710/021

  Clutch engagement state · CPC title

• B60Y2300/42

  Control of clutches · CPC title

• F16H59/105

  consisting of electrical switches or sensors · CPC title