System for controlling engaging and disengaging operations of releasable coupling device placed in automotive power train
First Claim
1. A releasable coupling control system in combination with an electronic engine control unit which executes a fuel cutoff mode during vehicle deceleration and a fuel-supply recovery mode as soon as an engine speed drops below a predetermined threshold value, for controlling engaging and disengaging operations of a releasable coupling device placed in an automotive power train between an engine and drive wheels, comprising:
- a wheel-speed sensor for detecting a drive-wheel speed to generate a drive-wheel speed indicative signal; and
a controller being configured to be responsive to said drive-wheel speed indicative signal for moderately releasing said releasable coupling device at a moderate turn-off mode where said releasable coupling device is moderately released at a predetermined time rate of change of disengagement, when the drive-wheel speed indicative signal value drops below a first predetermined value, and for quickly releasing said releasable coupling device at a quick turn-off mode where said releasable coupling device is quickly released by quickly fixing an apply pressure to a predetermined low pressure value and by quickly fixing a release pressure to a predetermined high pressure value, when the drive-wheel speed indicative signal value drops below a second predetermined value less than the first predetermined value.
2 Assignments
0 Petitions
Accused Products
Abstract
A releasable coupling control system in combination with an electronic engine control unit executable a fuel cutoff mode during vehicle deceleration and re-startable a fuel-supply recovery mode as soon as an engine speed drops below a predetermined threshold value, for controlling engaging and disengaging operations of a releasable coupling device placed in an automotive power train between an engine and drive wheels, comprises a wheel-speed sensor for detecting a drive-wheel speed to generate a drive-wheel speed indicative signal, and a controller being configured to be responsive to the drive-wheel speed indicative signal for moderately releasing the releasable coupling device at a moderate turn-off mode when the drive-wheel speed indicative signal value drops below a first predetermined value, and for quickly releasing the releasable coupling device at a quick turn-off mode when the drive-wheel speed indicative signal value drops below a second predetermined value.
53 Citations
8 Claims
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1. A releasable coupling control system in combination with an electronic engine control unit which executes a fuel cutoff mode during vehicle deceleration and a fuel-supply recovery mode as soon as an engine speed drops below a predetermined threshold value, for controlling engaging and disengaging operations of a releasable coupling device placed in an automotive power train between an engine and drive wheels, comprising:
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a wheel-speed sensor for detecting a drive-wheel speed to generate a drive-wheel speed indicative signal; and a controller being configured to be responsive to said drive-wheel speed indicative signal for moderately releasing said releasable coupling device at a moderate turn-off mode where said releasable coupling device is moderately released at a predetermined time rate of change of disengagement, when the drive-wheel speed indicative signal value drops below a first predetermined value, and for quickly releasing said releasable coupling device at a quick turn-off mode where said releasable coupling device is quickly released by quickly fixing an apply pressure to a predetermined low pressure value and by quickly fixing a release pressure to a predetermined high pressure value, when the drive-wheel speed indicative signal value drops below a second predetermined value less than the first predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification