发明名称 |
A CONTROL METHOD OF A POWER STEERING SYSTEM FOR A VEHICLE HAVING TWO STEERED AXLES |
摘要 |
A power steering system includes a first steering device which controls the steering of the first wheels of the vehicle according to a first steering angle α1 and includes a first actuator capable of providing a steering assistance effort, a second steering device including a second actuator controlled by a controller as a function of a parameter related to the steering wheel movement, and controlling the steering of the second wheels, according to a second steering angle α2. In normal operation of the power steering system, α2 is set according to a first rule depending on the first steering angle α1. In case the steering wheel torque is greater than a predetermined threshold, the second steering device is operated in a forced mode by setting the second steering angle according to a rule depending on the first steering angle and taking into account at least one different or additional data, in order to cause an offset-oversteering of the second wheel.;The first and second steering devices, which are mechanically independent, and furthermore preferably hydraulically independent, thereby increasing the system security.;The invention is of course not limited to the embodiments described above as examples, but encompasses all technical equivalents and alternatives of the means described as well as combinations thereof. |
申请公布号 |
US2015307128(A1) |
申请公布日期 |
2015.10.29 |
申请号 |
US201214647518 |
申请日期 |
2012.12.27 |
申请人 |
VOLVO TRUCK CORPORATION |
发明人 |
BLOND Jean-Marc;DORAY Jean-Baptiste |
分类号 |
B62D7/15;B62D7/14;B62D5/20 |
主分类号 |
B62D7/15 |
代理机构 |
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代理人 |
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主权项 |
1. A control method of a power steering system for a vehicle having two steered axles, the two steered axles comprising a first steered axle joining two first wheels, and a second steered axle joining two second wheels, the power steering system comprising:
a first steering device designed to control the steering of at least one of the first wheels, according to a first steering angle (α1), the first steering device comprising:
a mechanical transmission of the movement from a steering wheel of the vehicle to at least one of the first wheels;a steering assistance device including a first actuator controlled as a function of a parameter related to the steering wheel movement and capable of providing a steering assistance effort to at least one of the first wheels; a second steering device comprising a second actuator controlled by a controller as a function of a parameter related to the steering wheel movement, and designed to control the steering of at least one of the second wheels, according to a second steering angle (α2) which is set according to a first rule (F1(α1)) depending on the first steering angle (α1), in normal operation of the power steering system;wherein the control method comprises:
detecting or estimating whether a steering wheel torque (SWT) is greater than a predetermined threshold (SWTth); in case the steering wheel torque (SWT) is greater than the threshold (SWTth), operating the second steering device in a forced mode by setting the second steering angle (α2) according to a rule (F2, F1) which depends on the first steeling angle (α1) and which takes into account at least one different or additional data, in order to cause an offset-steering of the second wheel. |
地址 |
Göteborg SE |