Friction clutch control device
First Claim
1. A friction clutch control device located between an engine side drive shaft and a speed changer side input shaft for which power transmission is effected through a fluid coupling of a fluid coupling type automatic speed changer for a vehicle, comprising:
- a friction clutch;
a hydraulic operating device for operating said friction clutch into and out of engagement, said hydraulic operating device being coupled in parallel with said fluid coupling so as to provide a separate path for power transmission;
drive condition detecting means for detecting drive conditions of an engine of said vehicle;
speed difference detecting means for detecting a first difference (S) between speeds of said drive shaft and said input shaft;
speed difference setting means for setting a second speed difference (So) between said drive shaft and said input shaft according to a signal provided by said drive condition detecting means;
hydraulic pressure controlling means for controlling a hydraulic pressure supplied to said hydraulic operating device so that said first speed difference (S) detected by said speed difference detecting means approaches said second speed difference (So) set by said speed difference setting means; and
a fail-safe circuit which, when said first speed difference (S) is maintained at an abnormally large level for a predetermined period of time, stops said hydraulic pressure controlling means, to release said friction clutch.
1 Assignment
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Accused Products
Abstract
A control device for a hydraulic pressure operated friction clutch in an automatic speed changer has a device which detects a speed difference (S) between an engine drive shaft and an input shaft. Load and speed detecting devices detect the engine load and drive shaft speed respectively, this load and speed information being used to set a second speed difference (So). A hydraulic pressure controlling device then controls the hydraulic pressure supplied to the friction clutch control device so that the first speed difference (S) approaches the second speed difference (So). In addition, a fail-safe circuit releases the friction clutch if the first speed difference remains abnormally large for a predetermined period of time.
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Citations
12 Claims
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1. A friction clutch control device located between an engine side drive shaft and a speed changer side input shaft for which power transmission is effected through a fluid coupling of a fluid coupling type automatic speed changer for a vehicle, comprising:
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a friction clutch; a hydraulic operating device for operating said friction clutch into and out of engagement, said hydraulic operating device being coupled in parallel with said fluid coupling so as to provide a separate path for power transmission; drive condition detecting means for detecting drive conditions of an engine of said vehicle; speed difference detecting means for detecting a first difference (S) between speeds of said drive shaft and said input shaft; speed difference setting means for setting a second speed difference (So) between said drive shaft and said input shaft according to a signal provided by said drive condition detecting means; hydraulic pressure controlling means for controlling a hydraulic pressure supplied to said hydraulic operating device so that said first speed difference (S) detected by said speed difference detecting means approaches said second speed difference (So) set by said speed difference setting means; and a fail-safe circuit which, when said first speed difference (S) is maintained at an abnormally large level for a predetermined period of time, stops said hydraulic pressure controlling means, to release said friction clutch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification