JPS63219409A - Suspension system - Google Patents

Abstract

PURPOSE:To make it possible to accelerate or decelerate rapidly without weakening the feeling of the acceleration or deceleration and without accompanying surging by incorporating a characteristic of restricting longitudinal relative movements in addition to a characteristic of restricting vertical relative movements between a chassis and wheels. CONSTITUTION:A longitudinal direction suspension 3 and a vertical direction suspension 4 are respectively incorporated between a chassis 1 and a wheel 2 on a road surface 7. An acceleration-deceleration detection means 5 and a controller are also attached to the chassis. When an acceleration or deceleration of the chassis 1 is detected with the acceleration-deceleration detection means 5, an acceleration or deceleration information 8 is inputted to the controller 6. The controller 6 outputs a control signal 9 to the longitudinal direction suspension 3 so that the characteristics of the longitudinal direction suspension becomes to increase an amplitude at the time of building up a rapid acceleration and to restrict the amplitude toward the end of the initial buildup. This makes it possible to accelerate or decelerate rapidly without accompanying a weakening of an acceleration or deceleration feeling or without causing surging.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling longitudinal motion of an automobile, and particularly to a suspension system suitable for preventing surging while maintaining a sense of acceleration.

[Conventional technology]

Conventional suspension systems, whether with variable characteristics or fixed characteristics, have been configured to restrict the vertical relative movement between the suspension system and the wheels. This made it possible to adjust the motion characteristics such as bouncing and pitching to suit the purpose.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the control of the longitudinal relative motion between the vehicle body and the wheels, and tends to cause surging when the engine output torque or load torque suddenly changes, and the sense of acceleration during sudden acceleration is low. There was a problem.

An object of the present invention is to prevent surging from occurring when engine output torque or load torque suddenly changes.

An object of the present invention is to provide a suspension system that can maintain the feeling of acceleration during sudden acceleration.

[Means for solving problems]

The above object is achieved by positively incorporating characteristics of the suspension that restrict the relative movement of the vehicle body and wheels in the vertical direction as well as characteristics that restrict the relative movement of the vehicle body and wheels in the longitudinal direction.

[Effect]

Suspension characteristics that restrict the relative movement in the longitudinal direction between the vehicle body and the wheels determine the change characteristics of the longitudinal acceleration of the vehicle body due to the force transmitted from the wheels.

Therefore, surging, which is an oscillatory phenomenon of the longitudinal velocity of the vehicle body, can be promoted or suppressed by changing the longitudinal suspension characteristics. If the suspension characteristics are set so that the above-mentioned longitudinal relative motion becomes oscillatory at the initial start-up of sudden acceleration, the acceleration force of the vehicle body will be increased during the initial start-up, and the acceleration feeling will be improved. If the relative motion in the longitudinal direction becomes vibration-damping, changes in vehicle body acceleration will be reduced thereafter, and surging can be suppressed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1st
The suspension system shown in the figure consists of a vehicle body 1 and a road surface 7.
A longitudinal suspension 3 and a vertical suspension 4 are installed between the upper wheel 2 and an acceleration/deceleration detecting means 5 and a controller 6.

Here, the acceleration/deceleration check mark means 5 may be a vehicle body accelerometer, a wheel rotation speed system, an intake air flow meter, a throttle valve opening meter, or the like. Additionally, the spring characteristics and damping characteristics of the longitudinal suspension are variable.

Now, when the acceleration/deceleration detection means 5 detects acceleration/deceleration, it passes it to the controller 6 as acceleration/deceleration information 8. The controller 6 is configured to make the characteristics of the longitudinal suspension 3 vibrate at the initial start-up of sudden acceleration.

From around the end p of the initial rise, control information 9 is created and passed to the longitudinal suspension 3 to make the characteristics of the longitudinal suspension 3 vibration damping.

Control its characteristics.

According to this embodiment, the feeling of acceleration is not impaired.

Furthermore, it becomes possible to rapidly accelerate without causing surging.

〔Effect of the invention〕

According to the present invention, surging is less likely to occur when engine output torque or load torque suddenly changes.

Further, it is possible to perform sudden acceleration and deceleration without impairing the sense of acceleration or deceleration during sudden acceleration or deceleration, and without surging.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. Bad 1st

Claims (1)

[Claims] 1. In a vehicle having a variable suspension between the vehicle body (sprung mass) and the wheels (sprung mass), the characteristics of the variable suspension include spring characteristics and damping that constrain vertical relative motion between the vehicle body and the wheels. What is claimed is: 1. A suspension system characterized by having at least one of spring characteristics and damping characteristics that restrict relative movement in the longitudinal direction in addition to the above characteristics. 2. In the suspension system described in item 1 above, sudden acceleration and/or sudden deceleration information is detected, and suspension characteristics related to the longitudinal relative movement of the vehicle body and wheels are changed based on the detected information. Features a suspension system. 3. In the suspension system described in item 2 above, the suspension characteristics related to the relative movement in the longitudinal direction between the vehicle body and the wheels are changed so that the relative movement in the longitudinal direction becomes vibratory at the initial rise of sudden acceleration, and A suspension system characterized in that the relative motion in the longitudinal direction is changed so as to dampen vibration after the initial rise of the suspension ends.