JPH06219122A - Suspension control device for vehicle - Google Patents

Abstract

PURPOSE:To carry out anti-rolling control accurately by selecting a control map corresponding to a resudual fuel quantity, and controlling respectively and independently damping forces of both front and rear wheel side suspension mechanisms 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. In this case, the controller 25 selects a control map corresponding to the residual fuel quantity and also suitable for both front and rear wheel side suspension mechanisms, and controls respectively and independently damping forces of both the front and rear wheel side suspension mechanisms 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 depending on the remaining amount of fuel in the fuel tank, but the characteristics of the vehicle tend to be greatly influenced by the change in the vehicle weight and the center of gravity. In particular, the steering characteristic tends to change greatly between the full state of the fuel tank and the nearly empty state. For example, in the case of a vehicle equipped with a fuel tank at the rear of the vehicle body, if the suspension mechanism is set when the fuel tank is almost empty, the center of gravity will move toward the rear of the vehicle as the fuel tank gets closer to full. It becomes a little steered. On the other hand, if the suspension mechanism is set in a state where the fuel tank is almost full, the fuel tank moves toward the front of the vehicle as the fuel tank becomes closer to the sky, which causes a feeling of understeer.

However, in the conventional vehicle suspension control, although the above-mentioned control is performed based on the output signals of the brake switch, the accelerator switch, the steering sensor, the acceleration sensor, etc., the remaining amount of fuel in the fuel tank is taken into consideration. Since the anti-roll control was not performed, there was a problem that the steering characteristics depended on the remaining amount of fuel.

[0005]

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

[0006]

SUMMARY OF THE INVENTION The present invention relates to a vehicle speed control system for detecting a vehicle speed in a vehicle suspension control device configured to control a damping force of a front wheel side suspension mechanism and a rear wheel side suspension mechanism mounted on a vehicle. A detection unit, an angular velocity detection unit for detecting an angular velocity of the steering wheel, a fuel residual amount detection unit for detecting a fuel residual amount of the fuel tank, and an angular velocity of the steering unit provided corresponding to a degree of the fuel residual amount of the fuel tank. A plurality of control maps showing the relationship with the vehicle speed. Further, a control map corresponding to the degree of the remaining fuel amount in the fuel tank detected by the remaining fuel detecting means and adapted to the damping force control of the front wheel side suspension mechanism and the rear wheel side suspension mechanism is defined by the plurality of control maps. The damping force of each of the front wheel side suspension mechanism and the rear wheel side suspension mechanism is independently controlled according to which region of the selected control map the steering angular velocity detected by the angular velocity detecting means is selected. The control means is provided. This is intended to achieve the above-mentioned object.

[0007]

According to the present invention, when the vehicle is traveling, the control means controls the remaining fuel amount in the fuel tank detected by the remaining fuel detecting means (for example, a state near full tank, a state near empty, or
A control map corresponding to the intermediate state between full and empty) is selected from a plurality of control maps. Next, the control means controls the damping forces of the front wheel side suspension mechanism and the rear wheel side suspension mechanism independently of each other according to which region of the selected control map the steering angular velocity detected by the angular velocity detecting means is. . As a result, the anti-roll control can be accurately performed regardless of the degree of the remaining fuel amount in the fuel tank, in other words, regardless of the change in the vehicle weight or the center of gravity, so that the steering characteristic is set to the remaining fuel amount in the fuel tank. It is possible to solve the problem that depends on it, and therefore it is possible to improve the steering stability and the riding comfort.

[0008]

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 essential parts of a vehicle equipped with the vehicle suspension control device of the present 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 configuration of the vehicle suspension control device of this embodiment will be described with reference to FIG. 1. The controller 25 has a battery 28 via 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.

Further, inside the controller 25, FIG.
The control map φ, the control map 1, and the control map 2 shown in FIG. 5 are stored therein. In a vehicle equipped with the vehicle suspension control device of the present embodiment, the suspension mechanism is set in a state where the remaining fuel amount in the fuel tank is almost empty, so when the remaining fuel amount in the fuel tank is almost empty, The front wheel side oil dampers 3, 7 and the rear wheel side oil dampers 11, 15 are controlled based on the control map φ.

Further, when the remaining fuel amount in the fuel tank is close to half the tank capacity, the front wheel side oil dampers 3, 7 will be slightly oversteer than in the initial setting.
Is controlled based on the control map φ, and the rear wheel side oil dampers 11 and 15 are controlled based on the control map 1. Further, when the remaining amount of fuel in the fuel tank is almost full, the steering becomes more oversteer than the initial setting. Therefore, the front wheel side oil dampers 3 and 7 are controlled based on the control map φ and the rear wheel side oil damper 11 is controlled. ，
15 is controlled based on the control map 2.

Next, the operation of the vehicle suspension control device of this 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 almost empty (step S1). If the remaining fuel amount is near empty, the front wheel side A control map φ is selected for controlling the oil dampers 3, 7 and the rear wheel side oil dampers 11, 15 (step S2). After selecting the control map φ, based on the output signal of the steering sensor 18, whether the steering angular velocity ω is in the soft region of the control map φ (step S3) or whether it is in the medium region (step S).
4) Determine each.

When the determination in step S3 is affirmative, that is, when the steering angular velocity ω is in the soft region of the control map φ, the actuators 5, 9, 13, 17 are operated,
Front wheel side oil dampers 3, 7 and rear wheel side oil dampers 1
The damping forces of 1 and 15 are controlled to be in the "soft" state (step S5).

If the determination in step S3 is negative, step S3
If the determination in step 4 is affirmative, that is, if the steering angular velocity ω is in the medium region of the control map φ, the actuators 5, 9, 13, 17 are operated, and the front wheel side oil dampers 3, 7 and the rear wheel side oil damper 11 are operated. , 15 are controlled so that the damping force is in the "medium" state (step S
6).

When the determinations in steps S3 and S4 are negative, that is, when the steering angular velocity ω is in the hard region of the control map φ, the actuators 5, 9, 13, 17 are used.
Is operated to control the damping forces of the front wheel side oil dampers 3 and 7 and the rear wheel side oil dampers 11 and 15 to be in the "hard" state (step S7).

On the other hand, if the determination in step S1 is negative, it is determined whether or not the fuel remaining amount in the vehicle fuel tank is close to half the tank capacity (step S8). If the fuel remaining amount is close to half, , Because it will be slightly oversteer than the initial setting, select the control map φ for controlling the front wheel side oil dampers 3, 7 and select the rear wheel side oil damper 1.
The control map 1 is selected for controlling 1 and 15 (step S9). After selecting the control maps φ and 1, based on the output signal of the steering sensor 18, the steering angular velocity ω
Is in the soft area of the control map φ (step S
10), whether it is in the medium area (step S1)
1), judge each.

When the determination in step S10 is affirmative, that is, when the steering angular velocity ω is in the soft region of the control map φ, the rolling is small and the steering characteristics are not affected so much, so the actuators 5, 9, 1
3 and 17 are operated to control the damping forces of the front wheel side oil dampers 3 and 7 and the rear wheel side oil dampers 11 and 15 to be in the "soft" state (step S12).

If the determination in step S10 is negative and the determination in step S11 is positive, that is, the steering angular velocity ω
When is in the medium area of the control map φ, rolling is medium and a little oversteering occurs.
Actuating the actuators 5, 9, 13, and 17, the rear wheel side oil dampers 11 and 15 are in the "soft" state so that the front wheel side oil dampers 3 and 7 are in the "medium" state. Control is performed (step S13).

When the determinations in steps S10 and S11 are negative, that is, when the steering angular velocity ω is in the hard region of the control map φ, rolling is large and oversteering tends to occur. Therefore, the actuators 5, 9, 13, 1
7 is operated to control the damping forces of the front wheel side oil dampers 3 and 7 and the rear wheel side oil dampers 11 and 15 to be in the "hard" state (step S14).

On the other hand, if the determination in step S8 is affirmative, that is, if the remaining amount of fuel in the vehicle fuel tank is close to full, the control map φ is selected for controlling the front wheel side oil dampers 3, 7. The control map 2 is selected for controlling the rear wheel side oil dampers 11 and 15 (step S15).
After selecting the control maps φ and 2, whether the steering angular velocity ω is in the soft region of the control map φ based on the output signal of the steering sensor 18 (step S16), whether it is in the medium region (step S17), Judge each.

When the determination in step S16 is affirmative, that is, when the steering angular velocity ω is in the soft region of the control map 3, the rolling is small and the steering characteristics are not affected so much.
3 and 17 are operated to control the damping forces of the front wheel side oil dampers 3 and 7 and the rear wheel side oil dampers 11 and 15 to be in the "soft" state (step S18).

When the determination in step S16 is negative and the determination in step S17 is positive, that is, the steering angular velocity ω
When is in the medium area of the control map φ, rolling is medium and a little oversteering occurs.
Actuating the actuators 5, 9, 13, and 17, the rear wheel side oil dampers 11 and 15 are in the "soft" state so that the front wheel side oil dampers 3 and 7 are in the "medium" state. Control is performed (step S19).

When the determinations in steps S16 and S17 are negative, that is, when the steering angular velocity ω is in the hard region of the control map φ, rolling is large and oversteering tends to occur. Therefore, the actuators 5, 9, 13, 1
7 is operated to control the damping forces of the front wheel side oil dampers 3 and 7 to be in the "hard" state and the rear wheel side oil dampers to be in the "soft" state (step S2).
0).

As described above, according to the vehicle suspension control device of this embodiment, the front wheel side oil dampers 3, 7 and the rear wheel side oil dampers 11, 15 are selected according to the degree of the remaining fuel amount in the vehicle fuel tank. Of the front wheel side oil damper 3, depending on which region of the control map φ the steering angular velocity is in.
7 and rear wheel side oil dampers 11 and 15 are configured to independently change the damping force to either "soft", "medium" or "hard", so that the steering characteristics are oversteered. If it becomes understeer, it can be brought closer to the initial setting, which makes it possible to perform anti-roll control accurately regardless of the amount of fuel remaining in the fuel tank, and as a result, the steering characteristics Since it is possible to solve the problem that depends on the remaining amount of fuel in the fuel tank, it is possible to improve steering stability and riding comfort.

In this embodiment, in the vehicle equipped with the vehicle suspension control device, the suspension mechanism is set when the remaining fuel amount in the fuel tank is almost empty. It is also possible to set the suspension mechanism in a state close to full tank. In this case, conversely to the control of this embodiment described above, control is performed such that oversteering tends to occur as the remaining fuel amount decreases. do it.

[0030]

As described above, according to the vehicle suspension control device of the present invention, the suspension mechanism for the front wheels and the rear wheels are adapted to the degree of the remaining fuel amount in the fuel tank detected by the remaining fuel detecting means. A control map adapted to the damping force control of the suspension mechanism is selected from a plurality of control maps, and the front wheel suspension is selected according to which region of the selected control map the angular velocity of the steering wheel is in. Since the damping force of the mechanism and the damping force of the rear wheel side suspension mechanism are controlled independently of each other, anti-roll control can be accurately performed regardless of the amount of fuel remaining in the fuel tank. Since it is possible to solve problems that depend on the amount of fuel remaining in the fuel tank, it is possible to improve steering stability and riding comfort. It is possible to achieve the remarkable effect that kill.

[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 φ in this embodiment.

FIG. 4 is an explanatory diagram of a control map 1 in this embodiment.

FIG. 5 is an explanatory diagram of a control map 2 in this embodiment.

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

[Explanation of symbols]

3,7 Oil damper 11,15 as front wheel side suspension mechanism Oil damper 4,8,12,16 as rear wheel side suspension mechanism 4,8,12,16 Coil springs 5,9,13,17 Actuator 18 Steering sensor 19 as angular velocity detection means 19 Up and down Acceleration sensor 20 Vehicle speed sensor as vehicle speed detecting means 21 Throttle sensor 22 Brake switch 23 Ignition coil 24 Fuel gauge as remaining fuel detecting means 25 Controller as controlling means

[Procedure amendment]

[Submission date] November 19, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

First, the structure of the essential parts of a vehicle equipped with the vehicle suspension control device of the present 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 part 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 part 10, and a left rear wheel part 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 front wheel side suspension mechanism and a rear wheel side suspension mechanism mounted on a vehicle, the vehicle speed detecting means for detecting a vehicle speed, and an angular velocity of steering. A plurality of angular velocity detecting means for detecting, a fuel residual detecting means for detecting a residual fuel amount in the fuel tank, and a plurality of indicating the relationship between the angular velocity of the steering wheel and the vehicle speed, which are provided corresponding to the degree of the residual fuel amount in the fuel tank. And a control map corresponding to the degree of the remaining fuel amount in the fuel tank detected by the remaining fuel detecting means and adapted to the damping force control of the front wheel side suspension mechanism and the rear wheel side suspension mechanism. The steering angular velocity detected by the angular velocity detecting means is selected from a plurality of control maps, and the selected steering angle velocity is selected. The vehicle suspension control system being characterized in that comprises a control means, each for independently controlling the damping force of the front wheel suspension mechanism and the rear wheel suspension mechanism according to whether there in any region of the control map to.