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Electric Power Steering

A technology of electric power steering and motor, which is applied in the direction of electric steering mechanism, power steering mechanism, automatic steering control components, etc., and can solve problems such as out-of-control steering feeling, uncoordinated steering torque reduction, etc.

Active Publication Date: 2015-08-05
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In a vehicle designed using parallel geometry as above, since the sideslip angle of the rotating inner wheel changes to the opposite direction, the self-aligning torque changes to the divergent side, and if the steering angle becomes larger, the steering torque decreases, giving the operator It brings a sense of steering that feels like the steering wheel is out of control, and brings a sense of incongruity

Method used

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  • Electric Power Steering
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 》

[0076] refer to figure 1 , figure 2 An electric power steering device according to an embodiment of the present invention will be described. figure 1 is a block diagram of an electric power steering device according to a first embodiment of the present invention, figure 2 It is a functional block configuration diagram of the control device of the first embodiment.

[0077] (Overall structure of electric power steering)

[0078] figure 1 In the electric power steering device 100 , a main steering rod 3 provided with a steering wheel (steering wheel) 2 , a shaft 1 , and a gear shaft 5 are connected by two universal joints 4 , 4 . In addition, a pinion gear 7 provided at the lower end of the pinion shaft 5 engages with rack teeth 8a of a rack shaft 8 capable of reciprocating movement in the vehicle width direction, and both ends of the rack shaft 8 are connected via Tie rods 9 and 9 connect unillustrated articulated arms of the left and right steering wheels 10F and 10F...

no. 2 Embodiment approach 》

[0202] Next, refer to Figure 8 , Figure 9 and refer appropriately to Figure 4 , Figure 12The control device (motor control unit) 200B in the electric power steering system 100 of the second embodiment will be described.

[0203] The control device 200B of the electric power steering apparatus 100 in the second embodiment differs from the control device 200A of the electric power steering apparatus 100 in the first embodiment in that the low vehicle speed steering reaction force control unit 300A is replaced with a low vehicle speed steering reaction force control unit 200A. Steering reaction force control unit 300B.

[0204] Components that are the same as in the first embodiment are denoted by the same reference numerals, and overlapping descriptions are omitted. Figure 8 It is a functional block diagram of the control device in the second embodiment, Figure 9 It is an explanatory diagram of the setting method of the steering angle responsive gain in the steering ang...

no. 3 Embodiment approach 》

[0243] In the first embodiment and the second embodiment, the target steering angular velocity calculation unit 290, the steering angular velocity calculation unit 291, the subtractor 292, the correction current conversion unit 293, and the adder 283 constitute the "fluctuation range" described in the technical scope. Suppression unit", but not limited thereto.

[0244] refer to Figure 10 Another configuration example of the fluctuation range suppressing means will be described.

[0245] Figure 10 It is a functional block configuration diagram of a low vehicle speed steering reaction force control unit in the control device in the third embodiment.

[0246] Figure 10 In the shown control device (motor control unit) 200C, the low vehicle speed steering reaction force control unit 300C will figure 2 The low vehicle speed steering reaction force control unit 300A of the control device 200A in the illustrated first embodiment or its modified example is changed to a low veh...

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PUM

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Abstract

Provided is an electronic power steering apparatus that is applied to a vehicle provided with a steering mechanism with an Ackermann ratio lower than an ideal ratio and, wherein the electronic power steering apparatus does not give a driver feeling of strangeness, by making the steering angle vs. steering reaction force characteristic in a case of a low vehicle speed close to the characteristic of ideal Ackermann. A control device (200A) of the electronic power steering apparatus includes a low-vehicle-speed steering-reaction-force control section (300A). The low-vehicle-speed steering-reaction-force control section (300A) controls a target steering torque computation section (280) to set a steering angle sensitive target steering torque KT (¸H), based on a steering angle ¸H, a subtractor 281 to compute the torque deviation between the target steering torque KT (¸H) and a steering torque T, and a current conversion section (282) to compute a target current value ITFB1, based on the torque deviation. Then, the low-vehicle-speed steering-reaction-force control section (300A) adjusts a q-axis target current value ITG1 for applying a steering assisting force by an electric motor (11) as a q-axis target current value Iq* , wherein the adjustment is made by a target current value ITFB3 obtained by damping the variation in the target current value ITFB1.

Description

technical field [0001] The present invention relates to an electric power steering device, and more particularly to an electric power steering device suitable for a vehicle having a steering mechanism that does not achieve an ideal Ackermann ratio. Background technique [0002] The electric power steering device is a device in which an electric motor (motor) generates a steering assist force corresponding to the magnitude of the steering torque, transmits the steering assist force to the steering system, and reduces the steering force for the operator to steer. The following techniques are disclosed: using the inertia (inertia) of the steering system to compensate the base value current (assist torque) prescribed by the steering torque and vehicle speed, or using the damping (viscosity) of the steering system to correct The base current (assist torque) of the motor is controlled by using the inertia compensation and damping corrected current as the target current (see Patent...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/04B62D101/00B62D113/00B62D119/00
CPCB62D6/008B62D5/0463B62D6/00
Inventor 中村幸司稻叶和彦关谷重信森上智博濑户淳一河边怜山崎宪雄
Owner HONDA MOTOR CO LTD
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