JPH02246815A - Suspension control device - Google Patents

Abstract

PURPOSE:To intend speedy attitude control for a pressurized fluid feeding- discharging type attitude controlling suspension device by setting the direction of body inertia force and the direction of a spool movement for a solenoid valve in parallel and setting the supply port of a valve at the front position of an inertia direction in a front side arrangement and the discharge port of the valve at the rear position in a rear side arrangement. CONSTITUTION:For a proportional solenoid valve 7 which connects each cylinder of a suspension device to an oil tank and a pump, the moving directions (A), (B) of its spool 9 are in parallel with the directions of inertia forces (C), (D) on a body and the supply port 13 of a solenoid valve 7 for a wheel at the front position of the inertia force directions (C), (D) is set at the front part of the inertia force direction and the discharge port 14 of the valve 7 for the wheel at the rear position is set at the rear part of the inertia force direction. That is, valves 7a, 7b for cylinders 3a, 3b have a reverse direction to valves 7c, 7d for cylinders 3c, 3d, as illustrated. Such constitution permits speedy attitude control.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to suspension control that controls the attitude of a vehicle body by supplying and discharging pressure fluid to cylinders interposed between the vehicle body and each wheel. Regarding equipment.

(Prior Art) Conventionally, many suspension control devices have been proposed that suppress changes in the attitude of the vehicle body during vehicle motion, ensure stable maneuverability, and improve riding comfort.

As an example of such a suspension control device, hydraulic cylinders are interposed between the left front wheel, right front wheel, left rear wheel, and right rear wheel, respectively, and the vehicle body, and these hydraulic cylinders are connected to solenoid valves. There is one connected to the oil supply pump via.

When the vehicle moves, this suspension control device energizes the solenoid valve based on detection signals from various sensors, and this energization sets the spool at the oil supply port or oil drain port to supply and discharge oil to the hydraulic cylinder. I apply oil to prevent changes in posture. In other words, during acceleration such as when starting, the spool is moved so that the hydraulic cylinder on the rear wheel side communicates with the oil supply port, and the oil is supplied to the hydraulic cylinder on the rear wheel side, and the hydraulic cylinder on the front wheel side and the oil drain port are connected. The spool is moved so as to communicate with the front wheel to drain oil from the hydraulic cylinder on the front wheel side, thereby suppressing squat. Also, during deceleration such as braking,
In contrast to the above-mentioned acceleration, oil is supplied to the hydraulic cylinders on the front wheels and oil is drained from the hydraulic cylinders on the rear wheels to suppress dive.

(Problem to be solved by the invention) However, in the suspension control device described above,
A solenoid valve may be installed so that the direction of the vehicle body and the direction of movement of the spool almost match. In such a case, depending on the position of the supply/discharge port of the solenoid valve, the spool may be subject to inertial force, which may be opposed to suppressing attitude changes. The port and the hydraulic cylinder move so as to communicate with each other, and as a result, there is a problem in that the suppression of the change in posture is delayed and the amount of current applied to the solenoid valve increases accordingly.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a suspension device that can quickly suppress changes in the attitude of a vehicle body, and can further reduce the amount of current applied to a solenoid valve.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides cylinders connected to a pressure fluid supply source between the vehicle body side and each of a plurality of wheels, corresponding to the wheels. , a solenoid valve is provided between the pressure fluid supply source and each of the cylinders, and the solenoid valve moves the spool when energized to switch and connect the supply port or the discharge port to the cylinder connection port, and supplies and discharges pressure fluid to and from the cylinders. In a suspension control device that controls the attitude of a vehicle body, a solenoid valve is arranged so that the direction of an inertial force acting on the vehicle body and the direction of movement of the spool are substantially parallel, and a wheel is located forward in the direction of the inertial force. A solenoid valve that targets a wheel is arranged so that its supply port is located in front of the wheel in the direction of the inertial force, and a solenoid valve that targets a wheel located at the rear in the direction of the inertial force is located so that its discharge port is located in front of the wheel in the direction of the inertial force. It is characterized by being located at the rear in the direction of force.

(Function) Since the present invention is configured as described above, for example, when the moving direction of the spool is arranged in the front-rear direction of the vehicle body, when the vehicle accelerates, decelerates, or changes speed, the inertia A spool or cylinder of a solenoid valve that connects the connection port and a supply port, and a spool or cylinder of a solenoid valve that targets the wheels that are located at the rear in the direction of inertial force. An inertial force is applied to connect the connecting port and the discharge port. The spool can now be easily moved to quickly supply pressurized fluid to the cylinder connected to the solenoid valve that targets the wheel located in the front direction of the inertial force, and also to This allows pressurized fluid to be quickly discharged from a cylinder connected to a solenoid valve targeted at the wheel in question.

(Example) Below, an example of the present invention will be described in detail based on the drawings.

In FIG. 1, 1 indicates a suspension control device according to a first embodiment of the present invention. , :lb, 3c, and 3d (hereinafter collectively referred to as 3). The respective rods 4a, 4b, 4c of these hydraulic cylinders 3,
4d (hereinafter collectively referred to as 4) is connected to right and left front wheels, and right and left rear wheels (not shown), respectively.

Hydraulic cylinders 3a, 3b, lc, ld are proportional solenoid valves connected to pump 5 and tank 6 as a supply source of oil, which is an example of pressure fluid. a, 7b, 7c, and 7d (hereinafter collectively referred to as 7), the vehicle body is lifted relative to the wheels by being refueled, and by being drained, the vehicle body is lifted relative to the wheels. The vehicle body is lowered relative to the wheels. The proportional solenoid valve 7 has a configuration as shown in FIG. That is, a spool 9 is housed in a hollow housing 8 of the proportional solenoid valve 7 so as to be movable in the directions of arrows A and B. At both ends of the housing 8, proportional solenoids 10a and 10b for oil supply and oil drainage, which are energized and excited by a controller 17 to be described later, are symmetrically provided. Proportional solenoid log, lOb
The movable part of the machine is provided with bushings lla and llb. The bushing rods lla and llb are inserted into the housing 8 through through holes formed at both ends thereof. Springs 12a are provided on both sides of the spool 9 inside the housing 8, respectively.

12b is provided.

The housing 8 also has an oil supply port 13 that communicates with the pump 5. An oil drain port 14 communicating with the tank 6 and a cylinder port 15 communicating with the hydraulic cylinder 3 are formed respectively, and the spool 9 moves in the direction of arrow A within the housing 8 and is positioned at the oil drain port 14. By doing so, oil is drained from the hydraulic cylinder 3. Further, the spool 9 moves in the direction of arrow B and is positioned at the oil supply port 13, thereby supplying oil to the hydraulic cylinder 3.

When a vehicle equipped with a suspension control device configured as described above decelerates, such as when the brakes are applied, an inertial force acts on the vehicle in the direction of arrow C.・7a and 7b are the second
It is arranged so that the direction of arrow B in the figure matches the direction of this inertial force (direction of arrow C) (that is, the refueling port 13 is oriented in the direction of arrow C). Further, the proportional solenoid valves 7c and 7d for the rear wheels are arranged so that the oil drain port 14 is located in front of the arrow C, contrary to the proportional solenoid valves 7c and 7d for the front wheels.

This suspension control device l also includes a vehicle speed sensor,
It has a sensor 16 that is composed of an accelerator sensor, a brake sensor, an acceleration sensor, etc., and detects the magnitude and direction of longitudinal acceleration acting on the vehicle, and outputs this as a detection signal g. This sensor 16. A controller 17 is provided connected to the proportional solenoid valve 7 and a power supply circuit (not shown). Controller I7 is
A detection signal g is input, and the solenoid 10a or lOb of the proportional solenoid valve 7 is energized according to the detection signal g.

A suction force is applied to each button Schrot lla or itb, and the spool 9 is applied against the spring 12b or 12a.
move in either direction of arrows A or H.

Note that the reference numeral 18 in the figure indicates an accumulator.

The operation of the suspension control device I configured as described above will be explained separately for (a) acceleration such as when starting the vehicle, and (b) deceleration such as during braking.

(a) During acceleration When the vehicle starts accelerating, an inertial force acts on each spool 9 in the direction opposite to the arrow C (hereinafter referred to as the arrow direction), and the sensor 16 detects this and sends the detection signal g to the controller 17. Output to.

Then, the spools 9 of the proportional solenoid valves 7a and 7b
is caused by the excitation of the solenoid lOb.
In addition, the spools 9 of the proportional solenoid valves 7c and 7d receive the driving force and inertial force acting on Butschlot lla due to the excitation of the solenoid 10a, and both move in the direction of the arrow. Moving. Due to this movement, the proportional solenoid valves 7a and 7b communicate the oil drain port 14 and the cylinder port 15, and the proportional solenoid valves 7c and 7
d communicates with the oil supply port 13 and the cylinder cylinder port 15.

As a result, oil is supplied to the cylinders lc and ld on the rear wheel side, and oil is drained from the cylinders 3a and 3b on the front wheel side, thereby suppressing the front of the vehicle from lifting up.

(b) During deceleration During deceleration, contrary to the above-mentioned acceleration, an inertial force acts on the spool 9 in the direction of arrow C, and the hydraulic cylinders la and 3b on the front wheel side are supplied with oil, and the hydraulic cylinders la and 3b on the rear wheel side are supplied with oil. Oil is drained from the hydraulic cylinders 3c and 3d, and lifting of the rear of the vehicle body is suppressed.

In this way, the spool 9 is moved by the inertial force, so that the change in posture can be suppressed more quickly, and the amount of current applied can be reduced by shortening this time.

FIG. 3 shows a suspension control device 30 according to a second embodiment of the present invention.

This suspension control device 30 is applied when the vehicle turns and the vehicle body receives a lateral load in the rightward or leftward direction, and in this case, the vehicle body receives inertia forces in the directions of arrows F and E, respectively. On the other hand, proportional solenoid valves 27a, 27b, 27c, 27 connected to each hydraulic cylinder 3
d are arranged as follows.

That is, the right proportional solenoid valve 27a.

27c is installed so that the direction of arrow B in FIG.
3 facing the direction of arrow E). Also, the left proportional solenoid valve 27b.

27d is the oil drain port 14 opposite to the one on the right side.
is located in front of arrow E.

The sensor 16 is composed of a vehicle speed sensor, a steering wheel angle sensor, an acceleration sensor, etc., and detects the magnitude and direction of left-right acceleration acting on the vehicle.

In this suspension control device 30, when receiving inertia force in the direction of arrow E, the proportional solenoid valves 27a, 27c
The spool 9 moves in the direction of the arrow E and the hydraulic cylinder 3a
, 3c, and proportional solenoid valves 27b, 27.
Similarly, the spool 9 of d moves in the direction of arrow E and drains oil from the hydraulic cylinders 3b and 3d to prevent tilting in the direction of arrow E. Also, when receiving inertial force in the direction of arrow F, the spools 9 of the proportional solenoid valves 27b and 27d move in the direction of the arrow F to supply oil to the hydraulic cylinders 3b and 3d, and the spools 9 of the proportional solenoid valves 27a and 27c move in the same direction. It moves in the direction of arrow F and drains oil from the hydraulic cylinders 3a and 3c to prevent tilting in the direction of arrow F.

In addition, although the case where the pressure fluid was oil liquid was used as an example in the said Example, it is not necessarily limited to this, For example, gas, such as air, may be used.

(Effects of the Invention) As explained above, when the vehicle accelerates or decelerates or turns left and right, the spool moves under the influence of inertia and the wheels positioned in front in the direction of the inertia force move. Pressure fluid is immediately supplied to the cylinder connected to the solenoid valve targeted at the wheel, and pressured fluid is immediately discharged from the cylinder connected to the solenoid valve targeted at the rear wheel in the direction of inertia, thereby preventing changes in the posture of the vehicle body. This has the effect of not only being able to quickly suppress the change in posture, but also reducing the amount of current applied to the solenoid valve due to the speedy change in attitude.

[Brief explanation of drawings]

1 is a diagram schematically showing a suspension control device according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a proportional solenoid valve of the same device, and FIG. 3 is a diagram schematically showing a suspension control device according to a first embodiment of the present invention. 1 is a diagram schematically showing a suspension control device according to an embodiment. la, b, c, d...Hydraulic cylinder 5...Pump 7a, b, c, d...Proportional solenoid valve 9...
Subur l3... Oil supply port 14... Oil drain port 15... Cylinder port (2 others) 2nd cod Sakaki Mi self sacrilege r 1 Fig. 5... Pump 7a, b, c, d, = Ward side solenoid valve 9... Suguru 13... Lie port 14... Hanging 5111 port 15... - Cylinder port Figure 3

Claims (1)

[Claims] (1) A cylinder connected to a pressure fluid supply source is provided between the vehicle body side and each of a plurality of wheels, corresponding to each wheel, and the spool is moved by energization to the supply port or discharge to the cylinder connection port. A suspension control device in which a solenoid valve connected by switching ports is provided between the pressure fluid supply source and each of the cylinders to supply and discharge pressure fluid to and from the cylinders to control the attitude of the vehicle body. The solenoid valve is arranged so that the direction of the spool is almost parallel to the direction of movement of the spool, and the solenoid valve that targets the wheel located in the front in the direction of the inertial force is arranged so that its supply port is in the direction of the inertial force. A suspension characterized in that a solenoid valve that is located at the front and is targeted at a wheel that is located at the rear in the direction of the inertial force is located so that its discharge port is located at the rear in the direction of the inertial force. Control device.