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Vehicle steering system of the by-wire design type

A structural form and steering system technology, applied in anti-theft vehicle accessories, steering mechanisms, steering rods, etc., and can solve problems such as unstable driving conditions

Inactive Publication Date: 2011-04-13
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage is that with these steering-by-wire systems, the steering angle on the steerable wheels can also be adjusted independently of the driver's preferences, for example in such a way that unstable driving conditions can be counteracted

Method used

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  • Vehicle steering system of the by-wire design type
  • Vehicle steering system of the by-wire design type
  • Vehicle steering system of the by-wire design type

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The steering wheel that can be operated by the driver of the vehicle is thus indicated with 1 . Integrated on the steering column 2 , which is non-rotatably connected to the steering wheel, is a rotational angle sensor 3 with which the steering angle predetermined by the driver with his steering wheel 1 can be detected. according to figure 2 and 3 In the shown embodiment, a torque sensor 4 is also configured on the steering column 2, and the steering torque or hand torque predetermined by the driver on the steering wheel 1 can be detected by using this torque sensor; Sensors may also be configured in other embodiments.

[0023] In all embodiments, a hydraulic delivery unit 7 in the form of a piston-cylinder unit is arranged on the end of the steering column 2 opposite the steering wheel 1, the hydraulic delivery unit, more precisely the piston of the unit , using the rotational movement of the steering wheel 1, a suitable transmission mechanism is connected in the m...

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Abstract

The invention relates to a vehicle steering system of the by-wire design type, which lacks any mechanical linkage between a steering wheel and a steering transmission, an actuator controlled by an electronic control unit being installed ahead of said steering system, comprising a hydraulic fall-back level with a hydraulic feed unit coupled to the steering wheel and a hydraulic control unit coupled to said steering transmission, said hydraulic feed and control units able to be connected together by way of two hydraulic lines in such a way that when the actuator is non-functional, a steering wheel angular rotation is switched to a corresponding wheel steering angle by way of the hydraulic feed unit and the hydraulic control unit. The hydraulic lines can be connected by way of a switchable steering valve that is designed as a proportional valve with a flow cross section that is substantially continuously adjustable between the two extremes 'completely closed' and 'completely open'. The steering valve is also not in its completely open position when the actuator is functional, but is held in the closed position or brought to a partially open position when the substantially fixed association between the steering wheel angular rotation and the wheel steering angle is to be suspended. The actuator is controlled in such manner, at least when the steering valve is completely closed, that a desired hand torque at the steering wheel, said torque able to be sensed by the driver, adjusts for the respective steering process.

Description

technical field [0001] The invention relates to a vehicle steering system in the form of a drive-by-wire configuration without a mechanically coherent transmission between the driver's steering wheel and the steering mechanism that activates the steering movement of at least one steerable wheel predetermined by the driver through the steering wheel ( Durchtrieb), which can act on the steering mechanism is an actuator controlled by the electronic control unit using the predetermined signal of the steering wheel. The steering system has a hydraulic return plane (Riickfallebene), which has a hydraulic pressure coupled to the steering wheel. Delivery unit and a hydraulic actuating unit coupled to the so-called steering mechanism or forming the steering mechanism, whereby the hydraulic delivery unit and the hydraulic actuating unit can be connected to each other via two hydraulic lines, so that in the event that the actuator fails to operate A steering wheel rotation angle predeter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04B62D5/00B62D6/00
CPCB62D5/005B60R25/021B62D5/003B62D3/14
Inventor A·博茨N·尼切
Owner BAYERISCHE MOTOREN WERKE AG
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