EP0215352A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Torque control system for vehicles
Assignee: Mazda Motor Corp
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Filing: 1986-08-28
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Granted: —
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Expires: 2006-08-28
Abstract
Abstract A torque control system for vehicles provided with a four-wheel drive mechanism including a power plant (1) having an engine and transmission, and torque control means for controlling a torque distribution between front and rear wheels detecting rotation speed difference between the front and rear wheels (8,10) so that the torque distribution ratio of the rear wheels (10) to the front wheels (8) can be maintained at a given constant value irrespective of a change of the output torque of the power plant (1). The torque control system is provided with a vehicle speed sensor and steering angle sensor in order to obtain the rotation speed difference.
Inventors
- 👤 Kenichi Watanabe
- 👤 Hideshi Hiruta
- 👤 Manabu Hiketa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 18:19
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60K23/0808; Y; Y10; Y10S; Y10S477/00; Y10S477/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
182 words
A torque control system for vehicles provided with four-wheel drive system including a power plant producing a drive torque for driving wheels, torque transmitting mechanisms for transmitting the drive torque from the power plant to front and rear wheels respectively, and power transmitting means provided in at least one of said power transmitting mechanisms for changing the amount of the drive torque transmitted therethrough so that the torque distribution ratio between the front and rear wheels can be controlled , CHARACTERIZED IN THAT the torque control system further comprises vehicle speed detecting means for detecting a vehicle speed, steering angle detecting means for detecting a steered angle of the steering wheel, speed difference detecting means for detecting a rotation speed difference between the front and rear wheels , torque control means for controlling the amount of the torque transmitted through the power transmitting means in accordance with signals from said vehicle speed detecting means, steering angle detecting means and speed difference detecting means so that the torque distribution ratio between the front and rear wheels is maintained at a desirable constant value.
Claim 2
Dependent Claim
182 words
A torque control system for vehicles provided with four-wheel drive system including a power plant producing a drive torque for driving wheels, torque transmitting mechanisms for transmitting the drive torque from the power plant to front and rear wheels respectively, and power transmitting means provided in at least one of said power transmitting mechanisms for changing the amount of the drive torque transmitted therethrough so that the torque distribution ratio between the front and rear wheels can be controlled , CHARACTERIZED IN THAT the torque control system further comprises vehicle speed detecting means for detecting a vehicle speed, steering angle detecting means for detecting a steered angle of the steering wheel, speed difference detecting means for detecting a rotation speed difference between the front and rear wheels , torque control means for controlling the amount of the torque transmitted through the power transmitting means in accordance with signals from said vehicle speed detecting means, steering angle detecting means and speed difference detecting means so that the torque distribution ratio between the front and rear wheels is maintained at a desirable constant value.
Claim 3
Dependent Claim
53 words
A torque control system in accordance with claim 1 wherein said power transmitting means is a hydraulic clutch including a piston actuated by a hydraulic pressure, and drive and driven plates driven by said piston to be brought into contact with each other, said hydraulic pressure being controlled by said torque control means.
Claim 4
Dependent Claim
60 words
A torque control system in accordance with claim 2 wherein a hydraulic pressure control valve is provided in an oil passage to the hydraulic clutch, said control valve being adapted to produce a hydraulic pressure in proportion to a control current which is produced by said torque control means so as to be applied to the hydraulic pressure control valve.
Claim 5
Dependent Claim
46 words
A torque control system in accordance with claim 3 wherein said torque control means is provided with control maps in which predetermined control currents are memorized in accordance with input signals, the torque control means being adapted to produce the control current based on the maps.
Claim 6
Dependent Claim
35 words
A torque control system in accordance with claim 1 wherein said power transmitting means are provided in a torque transmitting path for transmitting the drive torque from the power plant to the front wheels .
Claim 7
Dependent Claim
156 words
6 A torque control system in accordance with claim 5 including a transmission disposed in the vicinity of an engine located transversely at front portion of an vehicle body, the transmission being provided with an input and output shaft extending in the axial direction of the output shaft of the engine, a ring gear in meshing engagement with an output gear of the transmission, a front differential gear mechanism relatively rotatable with the ring gear extending through the central portion of the ring gear, a hydraulic clutch disposed on the same axis as the ring gear so as to control engagement and disengagement between the ring gear and the front differential mechanism and changing the amount of the drive torque transmitted through the clutch device in accordance with a hydraulic pressure, and a rear wheel drive mechanism in meshing engagement with the ring gear for transmitting the drive torque from the engine to the rear wheels.
Claim 8
Dependent Claim
60 words
A torque control system in accordance with claim 6 wherein a hydraulic pressure control valve is provided in an oil passage to the hydraulic clutch, said control valve being adapted to produce a hydraulic pressure in proportion to a control current which is produced by said torque control means so as to be applied to the hydraulic pressure control valve.
Claim 9
Dependent Claim
34 words
A torque control system in accordance with claim 1 wherein said power transmitting means is provided in a torque transmitting path for transmitting the drive torque from the power plant to the front wheels.
Claim 10
Dependent Claim
105 words
A torque control system in accordance with claim 8 wherein said power transmitting means is a hydraulic clutch including a piston actuated by a hydraulic pressure, and drive and driven plates driven by said piston to be brought into contact with each other, said hydraulic pressure being controlled by said torque control means, and wherein a hydraulic pressure control valve is provided in an oil passage to the hydraulic clutch, said control valve being adapted to produce the hydraulic pressure in proportion to a control current which is produced by said torque control means so as to be applied to the hydraulic pressure control valve.
Claim 11
Dependent Claim
74 words
A torque control system in accordance with claim 1 wherein said torque control means includes a memory in which the amount of a predetermined torque to be transmitted is memorized in accordance with rotation speed difference between the front and rear wheels which correspond to vehicle speed and steered angle of the steering wheel, said torque control means being adapted to control the power transmitting means based on said memorized value of the torque.
Claim 12
Dependent Claim
50 words
A torque control system in accordance with claim 1 wherein said torque control means is adapted to maximize the amount of the torque transmitted through the power transmitting means under a high speed drive condition more than a predetermined vehicle speed at a small steered angle of the steering wheel.
References Cited (Backward Citations)
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