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Four-wheel steering system

A control device and four-wheel steering technology, which is applied to steering mechanisms, steering rods, automatic steering control components, etc., can solve the problem of not inhibiting the rear of the vehicle from contacting obstacles

Active Publication Date: 2019-10-22
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the four-wheel steering device disclosed in Japanese Patent Application Laid-Open No. 2-254061, it is only possible to suppress the rearward movement of the vehicle after the rear portion of the vehicle comes into contact with an obstacle. The case where the part protrudes further to the outside of the rotation does not inhibit the rear of the vehicle from contacting itself with the obstacle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0064] According to the first embodiment, the following effects can be obtained.

[0065] (1) When the driver starts the vehicle 10 and does not want to extend the rear part of the vehicle 10 to the outside of the rotation, the driver performs a trigger operation through the steering wheel 21, and the steering control mode of the rear wheels 12RR, 12RL can be adjusted , to switch from the anti-phase control that has been set by default to the non-phase control. Thus, the vehicle 10 moves without rotating.

[0066] (2) In addition, the driver considers the surrounding conditions of the vehicle 10 and determines whether or not to switch the rear-wheel steering control method when starting the vehicle 10 . Therefore, it is not necessary to provide special structures such as sensors for detecting the surrounding conditions of the vehicle 10 in the vehicle 10 , and accordingly, the structure of the vehicle 10 can be simplified.

[0067] (3) When the vehicle speed V is less than t...

no. 3 approach

[0090] Therefore, according to the third embodiment, not only the effects (1) to (3) of the first embodiment but also the following effects can be obtained.

[0091] (6) It is conceivable that, for some reason, the absolute value of the steering torque Ts is equal to or greater than the absolute value of the torque threshold ±Tth. Therefore, as the determination process of whether there is a trigger operation, it may be possible to execute only Figure 4 In the determination process of step S201 in the flowchart of , it may be incorrectly determined that a trigger operation has been performed. For this point, by Figure 10 As shown in the graph of , by setting the steering torque Ts that is equal to or greater than the absolute value of the torque threshold ± Tth multiple times within the set time t2 as the determination condition for trigger operation, it is possible to more accurately determine that the trigger is performed. operate. Therefore, it is possible to suppress ...

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Abstract

Provided is a four-wheel steering system capable of restraining a vehicle from contacting an obstacle while turning at the time the vehicle starts to move and also capable of simplifying the configuration of the vehicle. The four-wheel steering system includes a front-wheel steering system (13) that steers front wheels of a vehicle and a rear-wheel steering system (14) that steers rear wheels of the vehicle in accordance with a steering angle that is a rotation angle of a steering wheel. The rear-wheel steering system includes a second ECU (71) that, when the vehicle speed is equal to or lowerthan a vehicle speed threshold, performs antiphase control in which the rear wheels are steered in the opposite direction to that in which the front wheels are steered. When the vehicle speed is equal to or lower than the vehicle speed threshold, the second ECU (71) performs in-phase control in which the rear wheels are steered in the same direction as that in which the front wheels are steered,in response to a specific trigger operation that is performed via the steering wheel.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of Japanese Patent Application No. 2018-076133 filed on April 11, 2018, and its entire contents including specification, drawings and abstract are hereby cited. technical field [0003] The invention relates to a four-wheel steering device. Background technique [0004] Conventionally, for example, as described in Japanese Patent Application Laid-Open No. 2-254061 , there is known a four-wheel steering device that steers not only the front wheels but also the rear wheels in accordance with the operation of the steering wheel. When the vehicle is running at a low speed, the four-wheel steering device steers the rear wheels in the opposite direction to the front wheels according to the steering angle of the steering wheel. Accordingly, the vehicle can be turned with a smaller turning radius when the vehicle is maneuvered in a parking lot, for example. [0005] When a vehicle equippe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D7/15
CPCB62D7/1581B62D7/159B62D15/0265B62D15/027B62D6/002B62D6/02B62D7/026B62D7/1509
Inventor 山本康晴
Owner JTEKT CORP