Patent EP0076148A1 successfully refreshed from Google Patents.
EP0076148A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System for controlling the transmission torque of a four-wheel drive vehicle
Assignee: Subaru Corp
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Filing: 1982-09-28
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Granted: —
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Expires: 2002-09-28
Abstract
Abstract A control system for a four-wheel drive vehicle for automatically changing the transmission torque to rear wheels has a fluid pressure controlled friction clutch (22) which is in partial engagement state for ordinary driving conditions and which transmits the power of the engine to the rear wheels, so that, when the vehicle turns a corner, the friction clutch slips to allow the rear wheels to rotate slower than the front wheels. A load sensor (45) and a slip detecting device (42, 43) produce control signals. A control circuit (46) responds to the control signals to increase the engagement of the friction clutch (22) to provide adequate four-wheel driving.
Inventors
- 👤 Yasuhito Sakai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 13:59
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60K23/0808
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A control sytem for controlling a transmission torque of a four-wheel drive vehicle powered by an engine comprising a transmission (2, A, 14) for operatively transmitting power from the engine to the front wheels; a friction clutch (22) for transmitting the power to the rear wheels; and clutch operating means (30, 33, 35) for engaging and disengaging the friction clutch, characterised in that the clutch operating means comprise selecting means (39, 40) for providing optionally partial engagement of the clutch, an engagement greater than said partial engagement, or disengagement of the clutch; and in that the control system further comprises slip detecting means (42, 43) for detecting slipping of the wheels; load detecting means (45) for detecting the load on the engine; and control means (46) responsive to signals from the slip detecting means and the load detecting means for operating the selecting means so as to engage the clutch at the greater engagement at heavy load and at slipping of the wheels.
Claim 2
Dependent Claim
163 words
A control sytem for controlling a transmission torque of a four-wheel drive vehicle powered by an engine comprising a transmission (2, A, 14) for operatively transmitting power from the engine to the front wheels; a friction clutch (22) for transmitting the power to the rear wheels; and clutch operating means (30, 33, 35) for engaging and disengaging the friction clutch, characterised in that the clutch operating means comprise selecting means (39, 40) for providing optionally partial engagement of the clutch, an engagement greater than said partial engagement, or disengagement of the clutch; and in that the control system further comprises slip detecting means (42, 43) for detecting slipping of the wheels; load detecting means (45) for detecting the load on the engine; and control means (46) responsive to signals from the slip detecting means and the load detecting means for operating the selecting means so as to engage the clutch at the greater engagement at heavy load and at slipping of the wheels.
Claim 3
Dependent Claim
21 words
A control system according to claim 1, having a manual switch (44) for operating the selecting means to cause clutch disengagement.
Claim 4
Dependent Claim
22 words
A control system according to claim 1, wherein the friction clutch is a fluid pressure controlled friction clutch of the multiple-disc type.
Claim 5
Dependent Claim
36 words
A control system according to claim 3, wherein the control means comprises a pressure oil supply circuit including solenoid valves (39, 40) for operating the clutch and an electric circuit (46) for operating the solenoid valves.
References Cited (Backward Citations)
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