JPS632788A - Variable suspension system for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a variable suspension device for a motorcycle that prevents the body of the motorcycle from descending when the motorcycle starts or suddenly accelerates, and more specifically, to The present invention relates to a variable suspension device for a motorcycle that can variably control the damping force of a damper even in an acceleration method in which the clutch is engaged in an open state.

(Prior Art) In motorcycles, a phenomenon in which the vehicle body slants (referred to as a skort) occurs when starting or rapidly accelerating, which adversely affects ride comfort control and posture control of the motorcycle.

The applicant claims that a motorcycle is capable of varying the damping force of a damper in multiple stages by calculating an acceleration coefficient from the gear position and vehicle speed, and calculating the number of damping force stages from the acceleration coefficient and throttle opening speed. A variable suspension device has already been proposed (Utility Application No. 60-60456).

(Problem to be Solved by the Invention) The device described above controls the damping force of the damper to a small value even though the start is sudden when the accelerator is opened at a certain angle and the clutch and 7 are connected to start the vehicle. There was a problem with this.

The purpose of the present invention is to compare the number of damping force stages determined by the vehicle speed, throttle opening speed, and gear position with the number of damping force stages determined by the gear position and throttle opening, and adopt the larger one as the number of damping force stages. By doing so,
It is an object of the present invention to provide a variable suspension device for a motorcycle that can suitably control even an acceleration method in which a clutch is engaged while the accelerator is open.

(Means for Solving the Problems) In order to achieve the above object, a variable suspension device for a motorcycle according to the present invention includes a damping force variable mechanism that varies the damping force of a damper, and a damping force variable mechanism that changes the damping force of a damper, and detects the running speed of the vehicle and adjusts the vehicle speed. A vehicle speed sensor that outputs a signal, a throttle opening sensor that detects the throttle valve opening and outputs a throttle opening signal, and a gear position switch that detects the gear position being shifted and outputs a gear position signal. , a damping force stage number determined by a throttle opening speed signal based on the vehicle speed signal and the throttle opening signal and the gear position signal, and a damping force stage number determined by the gear position signal and the throttle opening signal. It is comprised of a damping force control circuit that outputs a control signal that sets the larger damping force stage number by comparison and holds that number of stages for a certain period of time, and an actuator that varies the damping force variable mechanism in multiple stages based on the control signal. There is.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings and the like.

FIG. 1 is a block diagram showing an embodiment of a variable suspension device for a motorcycle according to the present invention, and FIG. 2 is a sectional view showing a damper equipped with a variable damping force mechanism used in the device of the embodiment. FIG. 3 is a flowchart for explaining the operation of the control circuit used in the device of the embodiment, and FIGS. 4 to 6 respectively show the control master stored in the storage section of the control circuit.
It is a figure showing a knob.

In FIG. 1, l is a vehicle speed sensor, 2 is a waveform shaping circuit,
3 is a gear position switch, 4 is a throttle opening sensor, 5 is an A/D converter, 6 is a control circuit, 7 is an actuator driver, and 8 is an actuator.

The vehicle speed sensor 1 is a sensor for detecting the traveling speed of a motorcycle, and its output is waveform-shaped by a waveform shaping circuit 2 and then connected to a control circuit 6.

The gear position switch 3 is a switch that detects the currently shifted gear position using the switches 31 to 35 corresponding to the gear position and outputs a gear position signal from low to top knob, and its output is as follows. It is connected to the control circuit 6.

The throttle opening sensor 4 is a sensor that detects the opening of a throttle valve, and its output is digitally converted by an A/D converter 5 and then connected to a control circuit 6.

The control circuit 6 is a circuit that generates and outputs a damping force stage number signal according to the flowchart shown in FIG. 3 based on the detection signals from each of the sensors and the like. The output of the control circuit 6 is connected to an actuator 8 via an actuator driver 7.

The actuator 8 is for driving the damping force variable mechanism 20 provided in the damper 10 in stages,
For example, a linear solenoid is used.

The cylinder 11 of damper ①0 is a double cylindrical cylinder, and has an outer hydraulic chamber 12 and an inner hydraulic chamber 13 formed therein. An annular piston 15 is inserted into the outer hydraulic chamber 12, and a cylindrical piston rod 16 is connected to the piston 15. A coil spring 17 is provided between the piston rod 16 and the inner tube 14 of the cylinder 11.

The damping force variable mechanism 20 is provided on the side wall of the cylinder 11. The outer hydraulic chamber 12 and the inner hydraulic chamber 13 of the cylinder 11 are connected by a hydraulic passage 21 . A plunger 22 is movably provided in this hydraulic passage 21, and the opening degree of an orifice 23 is varied in multiple stages according to its stroke to adjust the amount of oil passing through this orifice 23, and the amount of oil passing through the orifice 23 is adjusted. Damping force can be varied.

The plunger 22 is driven by the actuator 8.

Next, the operation of the embodiment of the variable suspension device for a motorcycle according to the present invention will be explained.

First, the control circuit 6 receives the vehicle speed signal ■ from the vehicle speed sensor 1,
Gear position signal G from gear position switch 3
l+ Throttle opening signal AC is input from throttle opening sensor 4 (101).

Next, the throttle opening A from the throttle opening sensor 5
Based on C, calculate the throttle opening per unit time, that is, the throttle opening speed d (AC)/di (1
02).

The control circuit 6 calculates the acceleration coefficient A from the gear position signal G1 and the vehicle speed signal ■ according to the map 1 shown in FIG. 4 (103).

Here, the map 1 shown in FIG. 4 has gear position signals G1. The vertical axis represents the vehicle speed (2), which is divided into nine predetermined regions based on the combination of the gear position signal G and the vehicle speed (2). These nine areas are
This is a region indicating the magnitude of acceleration, and an acceleration coefficient A (1 to 5) is set corresponding to this region. The acceleration coefficient A indicates that the larger the value, the easier it is to accelerate.

Furthermore, the number of damping force stages DC is calculated from the acceleration coefficient and the throttle opening speed d(AC)/dt according to map 2 shown in FIG. 5 (104).

Here, map 2 shown in Fig. 5 has the throttle opening speed d(AC)/dt on the horizontal axis and the acceleration coefficient A on the vertical axis, and the throttle opening speed d(AC)/dt and The area is divided into four predetermined areas based on combinations of acceleration coefficients. These four areas are areas that indicate the size of the skort. Corresponding to this region, the number of damping force stages D
C, (1 to 4) is set, and the smaller the number, the larger the damping force becomes.

Next, the control circuit 6 calculates the number of damping force stages DC2 from the throttle opening AC and the gear position signal G1 according to the map 3 shown in FIG. 6 (105).

Here, the map 3 shown in FIG. 6 has the gear position G1 on the horizontal axis. The vertical axis shows the throttle opening AC.
It is divided into five regions depending on the combination of gear position G1 and throttle opening AC. The number of damping force stages DC2 (1 to 4) is set corresponding to this region. In addition, in map 3, gear position G1 is 4th and TO
At P, the vehicle speed V has already increased and enters the range of control based on vehicle speed ■ rather than control based on throttle opening AC, so the damping force is controlled using the minimum number of damping force stages and "control based on vehicle speed ■." I am entrusting it to you.

The control circuit 6 controls the damping force stage number DC determined in step 104 and the damping force stage number DC2 determined in step 105.
The larger one is determined as the number of damping force stages DC (
106).

The control circuit 6 outputs a signal to the actuator 8 via the driver 7 to change the damping force of the damper 10 to the determined number of damping force stages and maintain that number of stages for a certain period of time (for example, several seconds) (106). .

(Effects of the Invention) As explained above in detail, according to the present invention, the magnitude of the damping force of the damper can be controlled according to the magnitude of the skort during acceleration, and the skort during acceleration can be prevented from occurring. It can be prevented.

In particular, since the damping force of the damper can be variably controlled even in an acceleration method in which the clutch is engaged with the accelerator open, the motorcycle's attitude can be controlled in all situations to improve running stability.

[Brief explanation of drawings]

Fig. F is a block diagram showing an embodiment of a variable suspension device for a motorcycle according to the present invention, and Fig. 2 is a sectional view showing a damper equipped with a variable damping force mechanism used in the device of the embodiment. FIG. 3 is a flowchart for explaining the operation of the control circuit used in the device of the embodiment, and FIGS. 4 to 6 are diagrams showing control maps stored in the storage section of the control circuit, respectively. It is. 1... Vehicle speed sensor 2... Waveform shaping circuit 3
... Gear position switch 4 ... Throttle opening sensor 5 ... A/D converter 6 ... Microcomputer 7 ... Actuator driver 8 ... Actuator

Claims (1)

[Claims] A variable damping force mechanism that varies the damping force of the damper, a vehicle speed sensor that detects the vehicle speed and outputs a vehicle speed signal, and a throttle opening sensor that detects the opening of the throttle valve and outputs a throttle opening signal. a gear position switch that detects the gear position being shifted and outputs a gear position signal; and a damping force determined by the gear position signal and a throttle opening speed signal based on the vehicle speed signal and the throttle opening signal. a damping force control circuit that compares the number of stages and the number of damping force stages determined by the gear position signal and the throttle opening signal, sets the larger one as the number of damping force stages, and outputs a control signal to maintain the number of stages for a certain period of time; A variable suspension device for a motorcycle, comprising an actuator that varies the damping force variable mechanism in multiple stages according to the control signal.