JPH06219123A - Suspension control device for vehicle - Google Patents

Abstract

PURPOSE:To restrain a phenomenon that a squat quantity changes in an air conditioner operating condition, and improve a control characteristic by controlling damping force of a suspension mechanism on the basis of the relationship between throttle valve opening speed and two kinds of threshold values according to a condition of whether an air conditioner is stopped or operated. 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 whether an air conditioner is operated or stopped according to an output signal of an air conditioner switch 24, and controls maneuvering stability and comfortableness to ride in by controlling respective actuators 5, 9, 13 and 17 according to respective judged results, and controls damping force of a suspension mechanism according to a condition of whether throttle valve opening speed is larger than the first threshold value or not when the air conditioner is stopped. On the other hand, it controls the damping force according to a condition of whether the speed is larger than the second larger threshold value or not when the air conditioner is operated.

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]

In the case of a vehicle equipped with an air conditioner (air conditioner), when the air conditioner switch is turned on to operate the air conditioner, the engine power of the vehicle decreases, so that the air conditioner is operating. Even if the throttle valve opening speed of the carburetor was the same during and when stopped, the squat amount tended to decrease as the engine power decreased. That is, for example, if the engine is tuned when the air conditioner is stopped, even if the throttle valve opening speed is the same before and after the air conditioner is activated, the amount of squat decreases when the air conditioner is activated, so the suspension mechanism is "hard".
If this happens, riding comfort will deteriorate. On the other hand, for example, when the engine is tuned while the air conditioner is operating, even if the throttle valve opening speed is the same before and after the operation of the air conditioner, the squat amount increases when the air conditioner is operated, so that the steering stability deteriorates.

However, in the conventional vehicle suspension control, 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., but the operating state of the air conditioner (whether it is operating or stopped). Since the anti-squat control taking into consideration the above was not performed, there was a problem that the phenomenon that the amount of squat changed depending on the operating condition of the air conditioner affected the steering stability and riding comfort.

[0005]

It is an object of the present invention to improve the disadvantages of the above conventional example, and in particular, by incorporating the air conditioning switch output signal of the air conditioning system into the suspension control, the phenomenon that the squat amount changes depending on the operating state of the air conditioning system is suppressed. However, it is an object of the present invention to provide a vehicle suspension control device that achieves improved steering stability and riding comfort.

[0006]

SUMMARY OF THE INVENTION The present invention is a vehicle suspension control device equipped in a vehicle having a suspension mechanism, a carburetor, and an air conditioner, and a throttle detection for detecting a throttle valve opening speed of the carburetor. And a damping force of the suspension mechanism depending on whether the throttle valve opening speed detected by the throttle detection means is greater than a preset first threshold value when the air conditioner is stopped. However, when the air conditioner is in operation, the suspension mechanism depends on whether the throttle valve opening speed is greater than a second threshold value preset to a value greater than the first threshold value. And a control means for controlling the damping force of. 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 suspension mechanism depending on whether the throttle valve opening speed is higher than the first threshold value when the air conditioner is stopped. The damping force of the suspension mechanism is controlled according to whether the throttle valve opening speed is greater than a second threshold value that is greater than the first threshold value while the air conditioning system is in an operating state while controlling the damping force of the suspension mechanism. Control the force. Therefore, regardless of the operating state (operating / stopped) of the air conditioner, it is possible to minimize the change in the squat amount that raises the nose when the vehicle starts and accelerates rapidly. It is possible to prevent a phenomenon in which the amount of squat changes due to a reduction in engine power due to the operation of the device, and it is possible to improve steering stability and 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. Further, the instrument panel of the vehicle 1 is equipped with an air conditioner (not shown).

Further, 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 a throttle valve of a carburetor. A throttle sensor 21 for detecting the opening speed (depression of the accelerator pedal), a brake switch 22 for detecting the depression of the brake pedal, an ignition coil 23 for extracting an engine rotation speed signal, and for operating / stopping the air conditioner. An air conditioning switch 24 and an electronic suspension controller 25 (hereinafter abbreviated as a controller) for controlling suspension are 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,
Air-conditioning switch 24 and each actuator 5, 9, 13,
17 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 air conditioner based on the output signal of the air conditioning switch 24. Whether the actuator is operating or stopped, and each actuator 5, 9, 1 is determined based on the determination result.
By controlling Nos. 3 and 17, steering stability control (anti-nose dive control, anti-squat control, anti-roll control, etc.) and ride comfort control are performed.

FIG. 3 is a correlation characteristic diagram between the throttle valve opening speed (dEr / dt) and the squat amount (S) of the carburetor of the vehicle engine used in the suspension control of this embodiment (Er: engine). Rotation speed), controller 2
5 is dEr / dt ≦ A when the air conditioner is stopped.
When the relational expression (throttle valve opening speed threshold value) is satisfied, the damping force characteristics of the oil dampers 3, 7, 11, and 15 are controlled to be in the “soft” state, and dEr / dt>
If the relational expression A holds, the oil dampers 3, 7,
The damping force characteristics of 11 and 15 are controlled to be in the "hard" state.

On the other hand, when the relational expression of dEr / dt ≦ B (throttle valve opening speed threshold value) is satisfied during operation of the air conditioner, the controller 25 reduces the damping of the oil dampers 3, 7, 11, and 15. When the force characteristics are controlled to be in the "soft" state and the relational expression dEr / dt> B is satisfied, the damping force characteristics of the oil dampers 3, 7, 11, 15 are set in the "hard" state. It is designed to be controlled. In this case, the throttle valve opening speed threshold value B is set to a value larger than the throttle valve opening speed threshold value A.

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

The controller 25 determines whether the air conditioning switch 24 is in the on state or the off state, that is, whether the air conditioner is operating or stopped (step S1). When the air conditioner is stopped, the throttle valve opening speed dEr / It is determined whether dt is larger than the threshold value A (step S2). Next, the throttle valve opening speed dEr detected by the throttle sensor 21.
When / dt is smaller than the threshold value A, the actuators 5, 9, 13, 17 are operated and the oil dampers 3, 7, 1
The damping force characteristics of Nos. 1 and 15 are controlled to be in the "soft" state (step S3). Also, the throttle valve opening speed d
When Er / dt is larger than the threshold value A, the actuators 5, 9, 13, 17 are operated and the oil damper 3,
The damping force characteristics of 7, 11, and 15 are controlled to be in the "hard" state (step S4).

On the other hand, if it is determined in step S1 that the air conditioner is operating, the throttle valve opening speed dEr / dt.
Is greater than the threshold value B (step S
5). When the throttle valve opening speed dEr / dt is smaller than the threshold value B, the actuators 5, 9, 13, 17 are operated, and the damping force characteristics of the oil dampers 3, 7, 11, 15 are in the "soft" state. Control (step S
6). When the throttle valve opening speed dEr / dt is larger than the threshold value B, the actuators 5, 9, 13,
17 is operated to control the damping force characteristics of the oil dampers 3, 7, 11 and 15 to be in the "hard" state (step S7).

As described above, according to the vehicle suspension control system of this embodiment, the throttle valve opening speed is controlled depending on whether the air conditioner is operating or stopped, and when the air conditioner is operating. Whether the damping force characteristics of the oil dampers 3, 7, 11, 15 are appropriately set according to whether the throttle valve opening speed is greater than the threshold value B when the air conditioner is stopped or not when the air conditioner is stopped. Since the configuration is variably controlled to the "soft" state or the "hard" state, the operating state of the air conditioner
It is possible to suppress the change in the squat amount to a minimum regardless of whether the vehicle is stopped), and as a result, it is possible to improve steering stability and riding comfort.

[0019]

As described above, according to the vehicle suspension control apparatus of the present invention, it is determined whether the throttle valve opening speed is greater than the preset first threshold value when the air conditioner is stopped. Depending on whether or not the damping force of the suspension mechanism is controlled, if the air conditioner is operating, the throttle valve opening speed is greater than the first threshold value and is greater than the preset second threshold value. Since the damping force of the suspension mechanism is controlled depending on whether or not the air conditioner is operating (operating / stopped), the amount of squat that the nose rises when the vehicle starts and accelerates suddenly. Therefore, it is possible to prevent the phenomenon that the amount of squat changes due to the decrease in engine power due to the operation of the air conditioner as in the conventional case.
It is possible to achieve an effect that the steering stability and the riding comfort can be improved.

[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 showing a correlation characteristic of throttle valve opening speed-squat amount in the present embodiment.

FIG. 4 is a flowchart of a suspension control operation in this embodiment.

[Explanation of symbols]

3,7,11,15 Oil damper as suspension mechanism 4,8,12,16 Coil spring 5,9,13,17 Actuator 18 Steering sensor 19 Vertical acceleration sensor 20 Vehicle speed sensor 21 Throttle sensor 22 as throttle detecting means 22 Brake Switch 23 Ignition coil 24 Air conditioning switch 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] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title of vehicle Suspension control device

[Claims]

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]

In the case of a vehicle equipped with an air conditioner (air conditioner), when the air conditioner switch is turned on to operate the air conditioner, the engine power of the vehicle decreases, so that the air conditioner is operating. Sulo in and stopped
Even with the same opening speed, the amount of squat tends to decrease as the engine power decreases. That is,
For example, if the engine is tuned when the air conditioner is stopped, even if the throttle opening speed is the same before and after the air conditioner is activated, the squat amount will decrease when the air conditioner is activated. I feel uncomfortable. On the other hand, for example, when the engine is tuned while the air conditioner is operating, even if the throttle opening speed is the same before and after the operation of the air conditioner, the squat amount increases when the air conditioner is operated, so that the steering stability deteriorates.

However, in the conventional vehicle suspension control, 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., but the operating state of the air conditioner (whether it is operating or stopped). Since the anti-squat control taking into consideration the above was not performed, there was a problem that the phenomenon that the amount of squat changed depending on the operating condition of the air conditioner affected the steering stability and riding comfort.

[0005]

It is an object of the present invention to improve the disadvantages of the above conventional example, and in particular, by incorporating the air conditioning switch output signal of the air conditioning system into the suspension control, the phenomenon that the squat amount changes depending on the operating state of the air conditioning system is suppressed. However, it is an object of the present invention to provide a vehicle suspension control device that achieves improved steering stability and riding comfort.

[0006]

The present invention is provided in an engine-driven vehicle having a suspension mechanism and an air conditioner.
In the suspension controller for by vehicle, engine
Throttle opening of the throttle valve that adjusts the intake air amount to the engine
Throttle detecting means for detecting the degree provided, scan air conditioning system in the case of stopping, detected by the throttle sensing means
The damping force of the suspension mechanism is controlled according to whether the rottle opening speed is higher than a preset first threshold value,
If the air conditioner is in operation, the damping force of the suspension mechanism in accordance with whether large or not than a second threshold throttle opening speed is preset to a value larger than the first threshold value The control means for controlling 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 throttle opening when the air conditioner is stopped.
The damping force of the suspension mechanism is controlled according to whether or not the speed is higher than the first threshold value, while the throttle opening speed is higher than the first threshold value when the air conditioner is in the operating state. The damping force of the suspension mechanism is controlled according to whether it is larger than the threshold value of 2. Therefore, regardless of the operating state (operating / stopped) of the air conditioner, it is possible to minimize the change in the squat amount that raises the nose when the vehicle starts and accelerates rapidly. It is possible to prevent a phenomenon in which the amount of squat changes due to a reduction in engine power due to the operation of the device, and it is possible to improve steering stability and 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 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. Further, the instrument panel of the vehicle 1 is equipped with an air conditioner (not shown).

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 a throttle opening speed (accelerator). Throttle sensor 21 for detecting the depression of the pedal) and a brake switch 22 for detecting the depression of the brake pedal
An ignition coil 23 for extracting an engine rotation speed signal, an air conditioning switch 24 for operating / stopping an air conditioner, and an electronic suspension controller 25 (hereinafter abbreviated as a controller) for suspension control are provided. ing.

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,
Air-conditioning switch 24 and each actuator 5, 9, 13,
17 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 air conditioner based on the output signal of the air conditioning switch 24. Whether the actuator is operating or stopped, and each actuator 5, 9, 1 is determined based on the determination result.
By controlling Nos. 3 and 17, steering stability control (anti-nose dive control, anti-squat control, anti-roll control, etc.) and ride comfort control are performed.

Here, FIG. 3 shows the throttle opening speed (dE) of the vehicle engine used in the suspension control of this embodiment.
(Er: engine speed) is a correlation characteristic diagram between the r / dt) and the amount of squat (S), the controller 25, when the air conditioner is stopped, dEr / dt ≦ A ( throttle
When the relational expression " opening speed threshold value" is established, the damping force characteristics of the oil dampers 3, 7, 11, 15 are controlled to be in the "soft" state, and the relational expression dEr / dt> A is established. In this case, the damping force characteristics of the oil dampers 3, 7, 11 and 15 are controlled so as to be in the "hard" state.

On the other hand, the controller 25 controls the damping force of the oil dampers 3, 7, 11, 15 when the relational expression dEr / dt≤B ( throttle opening speed threshold value) is satisfied during the operation of the air conditioner. The characteristics are controlled to be in the "soft" state, and when the relational expression dEr / dt> B is satisfied, the damping force characteristics of the oil dampers 3, 7, 11, 15 are controlled to be in the "hard" state. It is supposed to do. In this case, the throttle opening speed threshold B, Ro
It is set to a value larger than the threshold value A for the opening speed of the turtle .

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

The controller 25 determines whether the air conditioning switch 24 is on or off, that is, whether the air conditioner is operating or stopped (step S1). When the air conditioner is stopped, the throttle opening speed dEr / dt is determined. Is greater than the threshold value A (step S2). Next, the throttle opening speed dEr / d detected by the throttle sensor 21.
If t is smaller than the threshold value A, the actuator 5,
9, 13, 17, actuate the oil damper 3, 7, 11,
The damping force characteristic of 15 is controlled to be in the "soft" state (step S3). Also, the throttle opening speed dEr /
When dt is larger than the threshold value A, the actuators 5, 9, 13, 17 are operated and the oil dampers 3, 7, 1
The damping force characteristics of Nos. 1 and 15 are controlled to be in the "hard" state (step S4).

On the other hand, if it is determined in step S1 that the air conditioner is operating, it is determined whether the throttle opening speed dEr / dt is greater than the threshold value B (step S5).
When the throttle opening speed dEr / dt is smaller than the threshold value B, the actuators 5, 9, 13, 17 are operated,
The damping force characteristics of the oil dampers 3, 7, 11, 15 are controlled to be in the "soft" state (step S6). When the throttle opening speed dEr / dt is larger than the threshold value B, the actuators 5, 9, 13, 17 are operated and the damping force characteristics of the oil dampers 3, 7, 11, 15 are set to the “hard” state. Control so that (step S
7).

As described above, according to the vehicle suspension control system of the present embodiment, the slot depending on whether the air conditioner is operating or stopped, and when the air conditioner is operating.
If Le opening speed is large or not or air conditioning system than the threshold value A is down the throttle opening speed depending on whether large or not than the threshold value B, the damping force of the oil damper 3, 7, 11, 15 Since the characteristic is variably controlled to the “soft” state or the “hard” state, it is possible to suppress the change in the squat amount to a minimum regardless of the operating state (operating / stopped) of the air conditioner. As a result, it is possible to improve steering stability and riding comfort.

[0019]

As described above, according to the vehicle suspension control device of the present invention, whether the throttle opening speed is higher than the preset first threshold value when the air conditioner is stopped. The damping force of the suspension mechanism is controlled according to the above, and if the air-conditioning system is operating, whether the throttle opening speed is greater than the first threshold value and is greater than the second threshold value set in advance. Since the damping force of the suspension mechanism is controlled according to the above, the change in the squat amount that the nose portion rises during vehicle start-up and sudden acceleration is minimized regardless of the operating condition (operating / stopped) of the air conditioner. Therefore, it is possible to prevent the phenomenon that the squat amount changes due to the decrease of the engine power accompanying the operation of the air conditioner as in the conventional case, and thus the steering stability and the riding comfort are reduced. It can be an effect that can be improved.

[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 showing a correlation characteristic of throttle opening speed -squat amount in the present embodiment.

FIG. 4 is a flowchart of a suspension control operation in this embodiment.

[Explanation of reference signs] 3,7,11,15 Oil damper as suspension mechanism 4,8,12,16 Coil spring 5,9,13,17 Actuator 18 Steering sensor 19 Vertical acceleration sensor 20 Vehicle speed sensor 21 As throttle detection means Throttle sensor 22 Brake switch 23 Ignition coil 24 Air conditioning switch 25 Controller as control means

Claims (1)

[Claims] 1. A vehicle suspension control device equipped on a vehicle having a suspension mechanism, a carburetor, and an air conditioner, comprising: throttle detection means for detecting a throttle valve opening speed of the carburetor; and the air conditioner stopped. In the middle, the damping force of the suspension mechanism is controlled according to whether or not the throttle valve opening speed detected by the throttle detection means is larger than a preset first threshold value, and the air conditioner is operating. Control means for controlling the damping force of the suspension mechanism depending on whether the throttle valve opening speed is greater than a second threshold value preset to a value greater than the first threshold value. A suspension control device for a vehicle, comprising: