EP0314452A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power transmitting system for a four-wheel drive vehicle
Assignee: Subaru Corp
•
Filing: 1988-10-26
•
Granted: —
•
Expires: 2008-10-26
Abstract
Abstract A torque distribution deciding control unit (50) a planetary gear device (20) as a central differential and an oil hydraulic clutch (27) having opposed disks are provided on a motor vehicle. The clutch (27) is disposed between output members of the planetary gear device, whereby torque is transmitted to front and rear wheels (10, 14) at a distribution ration decided by the torque transmission of the clutch. The control unit operates the clutch so as to distribute the torque at a ratio in accordance with slipping of either of the front wheels so as to reduce the torque to the slipping wheels.
Inventors
- 👤 Kazunari C/O Patent Division Tezuka
- 👤 Haruo C/O Patent Division Fujiki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 17:33
CPC Classifications
B; B60; B60K; B60K28/00; B60K28/10; B60K28/16; B60K28/165; B60K23/00; B60K23/08; B60K23/0808
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
254 words
A power transmitting system for a four-wheel drive vehicle comprising a differential (20) for dividing the torque of an engine at a predetermined ratio, power trains for transmitting the torque to front and rear wheels of the vehicle, and a control device including a clutch (27) arranged to act between the output members of the differential (20), for changing the distribution ratio, and a clutch actuator (30) characterised by the provision of: detecting means for detecting driving conditions of the vehicle including; speeds of the front and rear wheels and speed of the vehicle and for producing condition signals dependant on the detected conditions; deciding means (50) responsive to the condition signal for determining a desired torque distribution ratio and for producing a distribution ratio signal representing the desired torque distribution ratio; an antilock brake system (77) producing an antilock brake signal; two-wheel slip detecting means (66) responsive to the condition signals for producing a two-wheel slip signal when either of the front wheels or rear wheels are slipping; four-wheel slip detecting means (71) responsive to the condition signals in the absence of the two-wheel slip signal for producing a four-wheel slip signal; the clutch actuator (30) responding to the two-wheel slip signal to engage the clutch (27) so as to reduce the torque applied to the slipping wheels; correcting means responsive to the antilock brake signal for correcting clutch torque; and throttle actuator means (16) responsive to the four-wheel slip signal to at least partly close the throttle valve (15) of the engine.
Claim 2
Dependent Claim
254 words
A power transmitting system for a four-wheel drive vehicle comprising a differential (20) for dividing the torque of an engine at a predetermined ratio, power trains for transmitting the torque to front and rear wheels of the vehicle, and a control device including a clutch (27) arranged to act between the output members of the differential (20), for changing the distribution ratio, and a clutch actuator (30) characterised by the provision of: detecting means for detecting driving conditions of the vehicle including; speeds of the front and rear wheels and speed of the vehicle and for producing condition signals dependant on the detected conditions; deciding means (50) responsive to the condition signal for determining a desired torque distribution ratio and for producing a distribution ratio signal representing the desired torque distribution ratio; an antilock brake system (77) producing an antilock brake signal; two-wheel slip detecting means (66) responsive to the condition signals for producing a two-wheel slip signal when either of the front wheels or rear wheels are slipping; four-wheel slip detecting means (71) responsive to the condition signals in the absence of the two-wheel slip signal for producing a four-wheel slip signal; the clutch actuator (30) responding to the two-wheel slip signal to engage the clutch (27) so as to reduce the torque applied to the slipping wheels; correcting means responsive to the antilock brake signal for correcting clutch torque; and throttle actuator means (16) responsive to the four-wheel slip signal to at least partly close the throttle valve (15) of the engine.
Claim 3
Dependent Claim
42 words
A system according to claim 1 characterised in that the clutch is an oil hydraulic clutch having opposed disks which operate to transmit torque according to a difference in the speeds of the disks and the actuating pressure applied to the clutch.
Claim 4
Dependent Claim
18 words
A system according to claim 1 or claim 2 characterised in that the differential is a planetary gear.
Claim 5
Independent Claim
31 words
A system according to any preceding claim characterised in that the four-wheel slip signal is generated in dependance on the difference between vehicle body acceleration and acceleration of the vehicle wheels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.