JPH06219121A - Suspension control device for vehicle - Google Patents

Abstract

PURPOSE:To restrain rolling or the like regardless of a degree of a residual fuel quantity by selecting a control map corresponding to the resudual fuel quantity, and controlling damping force of a suspension mechanism according to a condition where the angular velocity of steering is in either area of the control map. CONSTITUTION:A controller 25 judges a vehicle condition according to respective output signals of a steering sensor 18, a vertical acceleration sensor 19, a vehicle speed sensor 20, a throttle sensor 21 and a brake switch 22, and judges a condition of a residual fuel quantity according to an output signal of a fuel gauge 24, and controls maneuvering stability and comfortableness to ride in by controlling respective actuators 5, 9, 13 and 17 according to respective judged results. By the way, plural control maps are stored inside of the controller 25. The controller 25 selects the control map corresponding to the residual fuel quantity, and controls damping force of a suspension mechanism according to a condition where the angular velocity of steering is in either area of the control map.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension control device for a vehicle, and more particularly to a suspension control device for a vehicle which is suitable for achieving both steering stability and riding comfort of the vehicle.

[0002]

2. Description of the Related Art Conventionally, in a vehicle, an anti-nose dive control that suppresses the nose dive phenomenon that the nose portion of the vehicle lowers during braking, an anti-squat control that suppresses the squat phenomenon that the nose portion of the vehicle rises during start-up and sudden acceleration Various controls such as anti-roll control that suppresses the rolling phenomenon in which the vehicle rolls during turning (when cornering) and ride comfort control that improves the ride comfort of the vehicle when traveling on a bad road are performed. In this case, the signals used for the control described above are
There are output signals from the brake switch, accelerator switch, steering sensor, acceleration sensor, etc.

[0003]

By the way, in a vehicle,
The vehicle weight and the center of gravity change according to the amount of fuel remaining in the fuel tank, but the characteristics of the vehicle tend to be greatly affected by the change in the vehicle weight and the center of gravity. There is a tendency for a large change between a full state and a state close to the sky. However, in the conventional technology, a brake switch, an accelerator switch, a steering sensor,
Although the above-mentioned control was performed based on the output signal of the acceleration sensor, etc., the anti-roll control that did not consider the remaining amount of fuel in the fuel tank was not performed, so the steering stability of the vehicle is determined by the remaining amount of fuel. There was a problem that depended on it.

[0004]

It is an object of the present invention to improve the inconveniences of the above-mentioned conventional example, and particularly to suppress the phenomenon that the steering stability is influenced by the remaining amount of fuel in the vehicle fuel tank.
An object of the present invention is to provide a vehicle suspension control device that achieves improved steering stability and riding comfort.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a vehicle suspension control device configured to control a damping force of a suspension mechanism mounted on a vehicle, and a vehicle speed detecting means for detecting a vehicle speed and a steering wheel. An angular velocity detecting means for detecting an angular velocity, a fuel detecting means for detecting a remaining fuel amount in a fuel tank, and a relationship provided between the angular velocity of the steering wheel and a vehicle speed, which are provided corresponding to a degree of the remaining fuel amount in the fuel tank, are shown. A plurality of control maps, selecting a control map corresponding to the remaining fuel amount of the fuel tank detected by the fuel detection means from the plurality of control maps, and determining the angular velocity of the steering wheel detected by the angular velocity detection means. A control means for controlling the damping force of the suspension mechanism according to which region of the selected control map is present; It has a configuration that. This achieves the above object.

[0006]

According to the present invention, when the vehicle is running, the control means controls the fuel remaining amount in the fuel tank detected by the fuel detection means (for example, whether the tank is full or empty, or between full tank and empty). The control map corresponding to the state) is selected from a plurality of control maps. Next, the control unit controls the damping force of the suspension mechanism according to which region of the selected control map the steering angular velocity detected by the angular velocity detection unit is. This makes it possible to suppress rolling during turning of the vehicle regardless of the degree of the remaining fuel amount in the fuel tank, in other words, regardless of changes in the vehicle weight and the center of gravity. Therefore, it is possible to solve the problem that the steering stability depends on the remaining amount of fuel in the fuel tank.
It is possible to improve steering stability and riding comfort.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which the vehicle suspension control device of the present invention is applied will be described below with reference to the drawings.

First, the structure of the main part of a vehicle equipped with the vehicle suspension control device of this embodiment will be described with reference to FIG. 2. The right front wheel part 2 of the vehicle 1 has an oil damper 3,
An actuator 5 for changing the damping force of the coil spring 4 and the coil spring 4 is provided, and an oil damper 7, a coil spring 8, and an actuator 9 for changing the damping force of the coil spring 8 are provided on the left front wheel portion 6. An oil damper 11, a coil spring 12, and an actuator 13 for changing the damping force of the coil spring 12 are disposed on the right rear wheel portion 10, and the left rear wheel portion 14 is provided.
An oil damper 15, a coil spring 16, and an actuator 17 that changes the damping force of the coil spring 16 are disposed in the.

Inside the vehicle 1, a steering sensor 18 for detecting a steering angle, a vertical acceleration sensor 19 for detecting a vertical acceleration of the vehicle, a vehicle speed sensor 20 for detecting a vehicle speed, and an accelerator pedal depression. A throttle sensor 21 for detecting, a brake switch 22 for detecting depression of a brake pedal, an ignition coil 23 for extracting an engine rotation speed signal, a fuel gauge 24 for detecting a remaining amount of fuel in a fuel tank,
An electronic suspension controller 25 (hereinafter abbreviated as a controller) for controlling suspension is provided.

Next, the structure of the vehicle suspension control system of this embodiment will be described with reference to FIG. 1. The controller 25 has a battery 28 through fuses 26 and 27.
And the ignition switch 30 via the fuse 29.
Brake switch 22, stop lamp 31,
Auto / sport switch 32 and DN switch 33
, Ignition coil 23, and noise filter 34
And a sport / auto lamp 35 are connected to each other. Further, the controller 25 includes a vehicle speed sensor 20,
Steering sensor 18, vertical acceleration sensor 19,
Throttle sensor 21, EPI controller 36,
Fuel gauge 24 and each actuator 5, 9, 13, 1
7 and 7 are connected to each other.

The controller 25 determines the state of the vehicle based on the output signals of the steering sensor 18, the vertical acceleration sensor 19, the vehicle speed sensor 20, the throttle sensor 21, and the brake switch 22, and the vehicle fuel based on the output signal of the fuel gauge 24. The remaining amount of fuel in the tank is judged, and each actuator 5, based on the judgment result.
By controlling 9, 13, and 17, steering stability control (anti-nose dive control, anti-squat control, anti-roll control, etc.) and ride comfort control are performed.

In this case, inside the controller 25,
The control map 1, the control map 2, and the control map 3 shown in FIGS. 3 to 5 are stored. The control map 1 used when the remaining amount of fuel in the vehicle fuel tank is almost empty is in a “softer” state than the control map 2 (when the oil damper is compressed).
Is difficult to enter from the "medium" state to the "hard" state (when the oil damper is extended), and the control map 2 used when the remaining fuel amount of the vehicle fuel tank is close to half the tank capacity is The control map 3 used when the ease of entering the "medium" state or the "hard" state is intermediate between the control map 1 and the control map 3 and the fuel remaining amount in the vehicle fuel tank is almost full Two
It is easier to enter from "soft" state to "medium" state or "hard" state than. That is, the threshold values of the steering angular velocity and the vehicle speed are set low in the order of control map 1, control map 2, and control map 3.

Next, the operation of the vehicle suspension control device of the present embodiment constructed as described above will be described with reference to FIGS.

Based on the output signal of the fuel gauge 24, the controller 25 determines whether or not the remaining fuel amount in the vehicle fuel tank is nearly full (step S1), and whether or not the remaining fuel amount is near half the tank capacity. Whether (step S2), each is determined. If the determinations in steps S1 and S2 are both negative,
That is, when the remaining fuel amount in the vehicle fuel tank is almost empty, the vehicle weight is reduced and the rolling becomes smaller than when the remaining fuel amount is close to full, so the control map 1 of FIG. 4 is selected (step S3). After the control map 1 is selected, whether the steering angular velocity ω is in the S (soft) region of the control map 1 based on the output signal of the steering sensor 18 (step S4) or in the M (medium) region (step S4). S5), each judgment.

If the determination in step S4 is affirmative, that is, if the steering angular velocity ω is in the S (soft) region of the control map 1, the actuators 5, 9, 13, 17 are operated and the oil dampers 3, 7, 11 are activated. , 15 are controlled so that the damping force is in the "soft" state (step S6). When the determination in step S4 is negative and the determination in step S5 is positive, that is, when the steering angular velocity ω is in the M (medium) region of the control map 1, the actuators 5, 9, 13, 17 are operated and the oil Dampers 3, 7,
The damping forces of 11 and 15 are controlled to be in the "medium" state (step S7). Also, steps S4 and S
If both are negative in the judgment of 5, that is, the steering angular velocity ω
Is in the H (hard) region of the control map 1, the actuators 5, 9, 13, 17 are operated so that the damping force of the oil dampers 3, 7, 11, 15 is controlled to be in the “hard” state. (Step S8).

On the other hand, when the determination in step S1 is negative and the determination in step S2 is positive, that is, when the remaining fuel amount in the vehicle fuel tank is close to half the tank capacity, the vehicle weight and rolling are full. The control map 2 in FIG. 5 is selected because it is in an intermediate state between the case close to the tongue and the case close to the sky (step S9). After the control map 2 is selected, whether or not the steering angular velocity ω is in the S (soft) region of the control map 2 based on the output signal of the steering sensor 18 (step S10) and whether it is in the M (medium) region (step S10). S11), each judgment.

If the determination in step S10 is affirmative, that is, if the steering angular velocity ω is in the S (soft) region of the control map 2, the actuators 5, 9, 13, 17 are operated and the oil dampers 3, 7, 11 are activated. , 15 are controlled so that the damping force is in the "soft" state (step S1).
2). If the determination in step S10 is negative and the determination in step S11 is positive, that is, the steering angular velocity ω
Is in the M (medium) area of control map 2,
The actuators 5, 9, 13, 17 are operated to control the damping forces of the oil dampers 3, 7, 11, 15 to be in the "medium" state (step S13). When the determinations in steps S10 and S11 are both negative, that is, when the steering angular velocity ω is in the H (hard) region of the control map 2, the actuators 5, 9, 13, 17 are operated and the oil dampers 3, 7 are activated. , 11 and 15 are controlled so as to be in the “hard” state (step S14).

On the other hand, if the determination in step S1 is affirmative,
That is, when the amount of remaining fuel in the vehicle fuel tank is near full, the vehicle weight increases and rolling becomes larger than when the amount of remaining fuel is near empty, so select control map 3 in FIG. Rolling is suppressed by entering the "medium" state or the "hard" state (step S15). After the control map 1 is selected, whether the steering angular velocity ω is in the S region of the control map 3 based on the output signal of the steering sensor 18 (step S1).
6), it is determined whether or not it is in the M area (step S17).

If the determination in step S16 is affirmative, that is, if the steering angular velocity ω is in the S (soft) region of the control map 3, the actuators 5, 9, 13, 17 are operated and the oil dampers 3, 7, 11 are activated. , 15 are controlled so that the damping force is in the "soft" state (step S1).
8). When the determination in step S16 is negative and the determination in step S17 is positive, that is, when the steering angular velocity ω is in the M (medium) region of the control map 3, the actuators 5, 9, 13, 17 are operated, The damping force of the oil dampers 3, 7, 11, 15 is "medium"
The state is controlled (step S19). Also,
When both the determinations in steps S16 and S17 are negative, that is, the steering angular velocity ω is H (hard) in the control map 3.
Actuators 5, 9, 13, 17 if in area
Is operated to control the damping force of the oil dampers 3, 7, 11, and 15 to be in the "hard" state (step S2).
0).

As described above, according to the vehicle suspension control apparatus of the present embodiment, whether the remaining fuel amount in the vehicle fuel tank is close to full, half the tank capacity, or empty. The optimum control map is selected according to each case, and depending on whether the steering angular velocity is in the “soft” area, the “medium” area, or the “hard” area in the selected control map, the oil Since the damper is configured to change to the optimum stage of "soft" or "medium" or "hard",
Regardless of the amount of fuel remaining in the fuel tank, it is possible to suppress rolling especially during turning of the vehicle, and as a result, there is a problem that the steering stability of the vehicle depends on the remaining amount of fuel in the vehicle fuel tank. It is possible to solve the problem and improve the driving stability and riding comfort.

[0021]

As described above, according to the vehicle suspension control device of the present invention, the control map corresponding to the remaining fuel amount in the fuel tank is selected from a plurality of control maps, and the steering angular velocity Since the damping force of the suspension mechanism is controlled according to which area of the selected control map, regardless of the amount of fuel remaining in the fuel tank, in other words, the vehicle weight and the center of gravity change. Therefore, it is possible to suppress rolling during turning of the vehicle, and as a result, it is possible to solve the problem that the steering stability depends on the remaining fuel amount in the fuel tank, and to improve the steering stability and riding comfort. That is, a remarkable effect can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle suspension control device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a main part of a vehicle in the present embodiment.

FIG. 3 is an explanatory diagram of a control map 1 in this embodiment.

FIG. 4 is an explanatory diagram of a control map 2 in this embodiment.

FIG. 5 is an explanatory diagram of a control map 3 in this embodiment.

FIG. 6 is a flowchart of a suspension control operation in this embodiment.

[Explanation of symbols]

3,7,11,15 Oil damper 4,8,12,16 as suspension mechanism Coil spring 5,9,13,17 Actuator 18 Steering sensor as angular velocity detecting means 19 Vertical acceleration sensor 20 Vehicle speed sensor as vehicle speed detecting means 21 Throttle sensor 22 Brake switch 23 Ignition coil 24 Fuel gauge as fuel detection means 25 Controller as control means

[Procedure amendment]

[Submission date] November 19, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

First, the structure of the main part of a vehicle equipped with the vehicle suspension control device of this embodiment will be described with reference to FIG. 2. The right front wheel part 2 of the vehicle 1 has an oil damper 3,
An actuator 5 for changing the damping force of the coil spring 4 and the oil damper 3 is arranged, and the left front wheel portion 6 is
Oil damper 7, coil spring 8, oil damper 7
An actuator 9 for changing the damping force of the oil damper 11 is arranged on the right rear wheel portion 10, and an oil damper 11, a coil spring 12, an actuator 13 for changing the damping force of the oil damper 11 are arranged on the right rear wheel portion 10, and a left rear wheel portion 14 is provided. Includes an oil damper 15, a coil spring 16, and an oil damper 15.
An actuator 17 for changing the damping force of is provided.

Claims (1)

[Claims] 1. A vehicle suspension control device configured to control a damping force of a suspension mechanism mounted on a vehicle, comprising: a vehicle speed detecting means for detecting a vehicle speed; and an angular velocity detecting means for detecting an angular velocity of steering. A fuel detecting means for detecting a remaining fuel amount in the fuel tank, and a plurality of control maps provided corresponding to the degree of the remaining fuel amount in the fuel tank and showing a relationship between the angular velocity of the steering wheel and the vehicle speed, A control map corresponding to the remaining amount of fuel in the fuel tank detected by the fuel detection unit is selected from the plurality of control maps, and the angular velocity of the steering detected by the angular velocity detection unit is determined by any one of the selected control maps. Vehicle including control means for controlling the damping force of the suspension mechanism depending on whether the vehicle is in a region Suspension control system.