Adaptive control device for vehicle starting clutch

Patent metadata

Field	Value
Publication number	US-10006509-B2
Application number	US-201415527379-A
Country	US
Kind code	B2
Filing date	Nov 20, 2014
Priority date	Nov 20, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

An adaptive control device is provided for a vehicle starting clutch. The adaptive control device includes a reverse brake as the starting clutch, and a clutch adaptive controller. The reverse brake is interposed between an engine and motor/generator, and the left and right rear wheels and is slip-engaged at a time of starting. The clutch adaptive controller performs clutch adaptive control, in which the reverse brake is subjected to a state in which a temperature of the reverse brake is at, or above, a second threshold for a timed period, at least one time before a vehicle begins to move.

First claim

The invention claimed is:

1. An adaptive control device for a vehicle starting clutch, comprising:
a starting clutch interposed between a drive source and a driving wheel, and that is slip-engaged at a time of starting movement of the vehicle; and
a clutch adaptive controller that carries out a clutch adaptive control at least once before a vehicle begins to move, in which the starting clutch is subjected to a state such that a temperature of the starting clutch is a predetermined temperature or higher for a predetermined period of time.

2. The adaptive control device according to claim 1 , wherein
the clutch adaptive controller provides a friction torque and a differential rotation to the starting clutch when in a vehicle stop state to establish a slip-engaged state in which frictional heat is generated the temperature of the starting clutch is increased to the predetermined temperature or higher at which point a progress of adaptation of a plate material is promoted, and subjects the starting clutch such that the clutch temperature is equal to or greater than the predetermined temperature for the period of time, which is required to stabilize a friction coefficient characteristic of the starting clutch.

3. The adaptive control device according to claim 1 , wherein
the clutch adaptive controller detects the temperature of the starting clutch, and increases a slip amount upon detecting the detected clutch temperature is low and decreases the slip amount when the detected clutch temperature is high.

4. The adaptive control device according to claim 1 , wherein
the clutch adaptive control controller manages the clutch temperature so as to not exceed an upper limit temperature at which point deterioration of friction facing material of the starting clutch is promoted when carrying out a clutch adaptive control by making the clutch temperature of the starting clutch a high-temperature.

5. The adaptive control device according to claim 4 , wherein
the clutch adaptive control controller carries out a control to maintain the temperature of the starting clutch at a temperature within a temperature range that is equal to or greater than the predetermined temperature and that does not exceed the upper limit temperature for the predetermined time.

6. The adaptive control device according to claim 5 , wherein
the vehicle is a hybrid vehicle comprising an engine and a motor as drive sources, a first clutch between the engine and the motor, and a second clutch between the motor and driving wheels as the starting clutch, wherein
when in a stopped state in which there is a request to suppress initial judder, the clutch adaptive controller sets the motor as an engine starting motor to start the engine by engaging the first clutch; then, after the engine start is completed, releases the first clutch at the same time as slip-engaging the second clutch, and selects a drive mode for carrying out a slip amount control of the second clutch by controlling the motor rotation speed, in order to start the starting clutch adaptive control.

7. The adaptive control device according to claim 6 , wherein
if a temperature that is lower than the predetermined temperature is set as a first threshold value and the predetermined temperature is set as a second threshold value, the clutch adaptive controller increases the slip amount to a first slip amount in which heat generation is higher than heat dissipation when the starting clutch adaptive control is started, maintains the first slip amount until the temperature of the second clutch reaches the first threshold value, and when the temperature of the second clutch reaches the first threshold value, reduces the slip amount to a second slip amount in which heat dissipation and heat generation balance out, maintains the second slip amount until the predetermined time has elapsed after the temperature of the second clutch becomes equal to or greater than the second threshold value, and ends the starting clutch adaptive control after the predetermined time has elapsed.

Assignees

• Nissan Motor

Inventors

• Matsui Hiroki
• Shimoyama Hiroki
• Murata Hiromichi

Classifications

• F16D2500/1107

  Vehicles · CPC title

• F16D2500/7043

  Clutch temperature · CPC title

• F16D48/062

  of a clutch system with a plurality of fluid actuated clutches · CPC title

• F16D48/02

  Control by fluid pressure · CPC title

• F16D2500/50293

  Reduction of vibrations · CPC title