EP0311140A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Active control for distributing driving force over four-wheels of four-wheel drive vehicle
Assignee: Nissan Motor Co Ltd
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Filing: 1988-10-10
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Granted: —
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Expires: 2008-10-10
Abstract
Abstract An active torque distribution control over four wheels of a motor vehicle detects a longitudinal acceleration and a side acceleration which the vehicle is subject to. Based on these longitudinal and side accelerations, a running mode which the vehicle is involved in is detected, and a torque distribution ratio of a portion of torque delivered to the front wheels to the remaining portion to the rear wheels and a differential limiting force are varied in response to a predetermined control schedule for the running mode detected.
Inventors
- 👤 Takashi Imaseki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:46
CPC Classifications
B; B60; B60K; B60K23/00; B60K23/08; B60K23/0808; B60W; B60W2520/00; B60W2520/10; B60W2520/105; B60W2520/12; B60W2520/125
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A system for controlling a torque distribution over a pair of primary driving wheels and a pair of secondary driving wheels of a motor vehicle when the motor vehicle is making a turn, the vehicle having a torque split and transfer means for varying a torque distribution ratio of a portion of torque toward the pair of secondary driving wheels to the remaining portion of torque toward the pair of primary driving wheels in response to a torque distribution ratio indicative signal, and a limited slip differential means disposed between the pair of primary driving wheels for varying a differential limiting force between the pair of primary driving rear wheels in response to a differential limiting force indicative signal, the system comprising: means for detecting a longitudinal acceleration which the vehicle is subject to and generating a longitudinal acceleration indicative signal; means for detecting a side acceleration which the vehicle is subject to and generating a side acceleration indicative signal; and controller means for controlling the torque distribution indicative signal and the differential limiting force indicative signal in response to said longitudinal acceleration indicative signal and said side acceleration indicative signal.
Claim 2
Independent Claim
191 words
A system for controlling a torque distribution over a pair of primary driving wheels and a pair of secondary driving wheels of a motor vehicle when the motor vehicle is making a turn, the vehicle having a torque split and transfer means for varying a torque distribution ratio of a portion of torque toward the pair of secondary driving wheels to the remaining portion of torque toward the pair of primary driving wheels in response to a torque distribution ratio indicative signal, and a limited slip differential means disposed between the pair of primary driving wheels for varying a differential limiting force between the pair of primary driving rear wheels in response to a differential limiting force indicative signal, the system comprising: means for detecting a longitudinal acceleration which the vehicle is subject to and generating a longitudinal acceleration indicative signal; means for detecting a side acceleration which the vehicle is subject to and generating a side acceleration indicative signal; and controller means for controlling the torque distribution indicative signal and the differential limiting force indicative signal in response to said longitudinal acceleration indicative signal and said side acceleration indicative signal.
Claim 3
Dependent Claim
66 words
A system as claimed in claim 1, wherein said controller means comprise means for distributing said longitudinal acceleration indicative signal to one of a plurality of classes and said side acceleration indicative signal to one of a plurality of classes, and means for retrieving a running mode allocated to a combination of the classes whcih said longitudinal and side acceleration indicative signals have been distributed to.
Claim 4
Dependent Claim
76 words
A system as claimed in claim 1, wherein said control means keep the torque distribution ratio indicative signal below decreased and the differential limiting force indicative signal increased until elapse of a predetermined time after said longitudinal acceleration indicative signal and said side acceleration indicative signal both have exceeded predetermined values, respectively. and subsequently increasing the torque distribution ratio indicative signal and decreasing the differential limiting force indicative signal after the elapse of said predetermined time.
Claim 5
Independent Claim
187 words
A method of controlling a torque distribution over a pair of primary driving wheels and a pair of secondary driving wheels of a motor vehicle when the motor vehicle is making a turn, the vehicle having a torque split and transfer means for varying a torque distribution ratio of a portion of torque toward the pair of secondary driving wheels to the remaining portion of torque toward the pair of primary driving wheels in response to a torque distribution ratio indicative signal, and a limited slip differential means disposed between the pair of primary driving wheels for varying a differential limiting force between the pair of primary driving rear wheels in response to a differential limiting force indicative signal, the method comprising the steps of: detecting a longitudinal acceleration which the vehicle is subject to and generating a longitudinal acceleration indicative signal; detecting a side acceleration which the vehicle is subject to and generating a side acceleration indicative signal; and controlling the torque distribution indicative signal and the differential limiting force indicative signal in response to said longitudinal acceleration indicative signal and said side acceleration indicative signal.
Claim 6
Independent Claim
187 words
A method of controlling a torque distribution over a pair of primary driving wheels and a pair of secondary driving wheels of a motor vehicle when the motor vehicle is making a turn, the vehicle having a torque split and transfer means for varying a torque distribution ratio of a portion of torque toward the pair of secondary driving wheels to the remaining portion of torque toward the pair of primary driving wheels in response to a torque distribution ratio indicative signal, and a limited slip differential means disposed between the pair of primary driving wheels for varying a differential limiting force between the pair of primary driving rear wheels in response to a differential limiting force indicative signal, the method comprising the steps of: detecting a longitudinal acceleration which the vehicle is subject to and generating a longitudinal acceleration indicative signal; detecting a side acceleration which the vehicle is subject to and generating a side acceleration indicative signal; and controlling the torque distribution indicative signal and the differential limiting force indicative signal in response to said longitudinal acceleration indicative signal and said side acceleration indicative signal.
Claim 7
Dependent Claim
83 words
A method as claimed in claim 4, wherein said controlling step includes a step of keeping the torque distribution ratio indicative signal below decreased and the differential limiting force indicative signal increased until elapse of a predetermined time after said longitudinal acceleration indicative signal and said side acceleration indicative signal both have exceeded predetermined values, respectively. and subsequently a step of increasing the torque distribution ratio indicative signal and decreasing the differential limiting force indicative signal after the elapse of said predetermined time.
References Cited (Backward Citations)
No citation records indexed.
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