JPH051513U - Vehicle height adjustment device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the motor drive circuit is disconnected or the battery voltage drops, the vehicle height should not drop during the vehicle height increasing operation. [Configuration] Air chambers 1a, 1 of the air suspension device
b, 2a, 2b and a passage 3 for communicating the discharge side of the air compressor 4 with a solenoid valve for supply and discharge,
The drive abnormality detector 16 is provided in the motor drive circuit 11 of the motor 8 that drives the air compressor 4, and when the vehicle height rises, the controller 19 normally supplies the power supply unit 12 of the motor drive circuit 11 and the supply / discharge solenoid valves 5a, 5b. Although an ON command and a valve opening command are issued respectively, when an abnormality detection signal is input to the controller 19 from the drive abnormality detector 16,
The controller 19 supplies and discharges solenoid valves 5a and 5b.
The valve opening command for was canceled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle height adjusting device used for adjusting a vehicle height of an automobile to a set vehicle height.

[0002]

[Prior Art]

 As a conventional vehicle height adjusting device, one shown in FIG. 3 is known.

In this vehicle height adjusting device, each of the air chambers 1a, 1b, 2a, 2b of the air suspension device is connected to the discharge side of the air compressor 4 through a passage 3, and the air is supplied and discharged in the middle of the passage 3. An exhaust passage 7 provided with an exhaust solenoid valve 6 is branched at a portion of the passage 3 which is located between the air compressor 4 and the supply / discharge solenoid valves 5a, 5b. Is provided. The supply / discharge solenoid valves 5a, 5b, the exhaust solenoid valve 6, and the motor 8 for driving the air compressor 4 are controlled by the controller 9, and the vehicle height detectors 13a, 13b, or the vehicle height detectors 13a, 13b. When a vehicle height increase signal is input from the operation panel 10 to the controller 9, the controller 9 issues an ON command to the power supply unit 12 of the motor drive circuit 11 and closes the exhaust solenoid valve 6. In this state, a valve opening command is issued to the supply / discharge solenoid valves 5a, 5b, the compressed air of the air compressor 4 is supplied to the air chambers 1a, 1b, 2a, 2b through the passage 3, and the vehicle height is increased. When a vehicle height decrease signal is input to the controller 9 from the detectors 13a and 13b or the operation panel 10, the controller is kept with the air compressor 4 stopped. From the sheet discharge solenoid valves 5a, 5b and valve-opening command is issued to the exhaust solenoid valves 6 each air chambers 1a, 1b, 2a, 2b compressed air is exhausted through the passageway 3, 7. In the figure, 14 is an air filter and 15 is a dryer.

This similar structure is shown, for example, in Japanese Patent Publication No. 62-31643.

[0005]

[Problems to be solved by the device]

 However, in the case of the conventional vehicle height adjusting device described above, if the vehicle height increasing signal is input to the controller 9 when the motor drive circuit 11 is broken or the battery voltage is low, the air compressor 4 is normally operated. The solenoid valves 5a, 5b for supply and discharge are opened while the engine is not activated, and the compressed air in the air chambers 1a, 1b, 2a, 2b flows back to the air-conditioner presser 4 side, resulting in a decrease in vehicle height. is there.

Therefore, the present invention is intended to provide a vehicle height adjusting device which does not cause a problem that the vehicle height is lowered during a vehicle height increasing operation even if the motor drive circuit is broken or the battery voltage drops. is there.

[0007]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, the present invention provides an air chamber of an air suspension device, an air compressor for supplying compressed air to the air chamber, a motor for driving an air conditioner compressor, a discharge side of the air compressor, and an air compressor. Supply / discharge solenoid valves that open and close the passages that connect the chambers, drive abnormality detectors provided in the motor drive circuit, and ON commands to the power supply section of the motor drive circuit and the supply / discharge solenoid valves when the vehicle height rises. It is equipped with a controller that issues a valve opening command and cancels the valve opening command to the supply / discharge solenoid valve when an abnormality detection signal from the drive abnormality detector is input.

[0008]

[Action]

 When the vehicle height rises, the controller issues an ON command to the power source of the motor drive circuit and an opening command to the supply / discharge solenoid valve, and compressed air from the compressor is supplied to the air chamber of the air suspension system. . If an attempt is made to raise the vehicle height in this state due to a break in the motor drive circuit or a drop in the battery voltage, this abnormality is detected by the drive abnormality detector provided in the motor drive circuit. This abnormality detection signal is input to the controller to cancel the valve opening command to the solenoid valve for supply / discharge. As a result, the air chamber and the compressor are not electrically connected.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIGS. The same parts as those shown in FIG. 3 are designated by the same reference numerals.

In the drawings, 1a, 1b, 2a, 2b are air chambers of an air suspension device arranged on the front side and the rear side, and these air chambers 1a, 1b, 2a, 2b are formed by an air passage 3 It is connected to the discharge side of the compressor 4. In the middle of the passage 3, supply / discharge solenoid valves 5a, 5b, which are switching valves, are provided, and the supply / discharge solenoid valves 5a, 5b open / close the passage 3. The supply / discharge solenoid valves 5a and 5b close the passage 3 in a normal state, and open the passage 3 when receiving a valve opening command (excitation signal) from the controller 19.

Reference numeral 7 denotes an exhaust passage branching into a portion of the passage 3 located between the air compressor 4 and the supply / discharge solenoid valves 5a and 5b. An exhaust solenoid valve 6 is installed in the air conditioner, and its end is connected to the intake side of the air conditioner press 4. The exhaust solenoid valve 6 normally closes the exhaust passage 7, and opens the exhaust passage 7 when receiving a valve opening command (excitation signal) from the controller 19.

Reference numeral 8 is a motor for driving the air compressor 4. A motor drive circuit 11 of the motor 8 is provided with a power supply section 12 and a drive abnormality detector 16 for checking the current value in the circuit. Has been. The drive abnormality detector 16 is electrically connected to the controller 19, and the controller 19 judges whether or not the detected current value is larger than a specified value, and changes the command according to the judgment result. There is. This will be described in detail later.

In the figure, 10 is an operation panel provided in the driver's seat, 13a and 13b are front and rear vehicle height detectors, 14 is an air filter connected to the intake side of the air compressor 4, and 15 Is a dryer provided near the discharge port of the air compressor 4 in the passage 3, and 17a and 17b are check valves.

Here, the control by the controller 19 will be described in detail.

(1) When lowering the vehicle height When a vehicle height down signal is input to the controller 19 from the vehicle height detectors 13a and 13b or the operation panel 10, the controller 19 supplies / disconnects the solenoid valve 5a. , 5b and the exhaust solenoid valve 6 are output with a valve opening signal, and the compressed air in the air chambers 1a, 1b, 2a, 2b is discharged through the passage 3 and the exhaust passage 7. As a result, the vehicle height drops by a predetermined amount.

(2) Increasing vehicle height As shown in the flowchart of FIG. 2, when a vehicle height increase signal is input to the controller 19 from the vehicle height detectors 13a and 13b or the operation panel 10, the controller 19 outputs an ON command to the power supply unit 12 to close the motor drive circuit 11, and the detected current value of the drive abnormality detector 16 is input to the controller 19 to determine whether the current value in the controller 19 is larger than the specified value. A decision is made. If the detected current value of the drive abnormality detector 16 is larger than the set value, there is no abnormality in the electric system and the air compressor 4 has started normally, but the detected current value is smaller than the specified value. For example, there is a high possibility that the air compressor 4 will not start normally due to an abnormality in the electrical system.

When the detected current value of the drive abnormality detector 16 is larger than the specified value (when the abnormality detection signal of the drive abnormality detector 16 is not input to the controller 19), the controller 19 is the solenoid valve for supply / discharge. By issuing a valve opening command only to 5a, 5b and opening the supply / discharge solenoid valves 5a, 5b with the exhaust solenoid valve 6 closed, the compressed air of the air compressor 4 is compressed into the air chambers 1a, 1b, 2a. , 2b. As a result, the vehicle height increases by a predetermined amount.

Further, when the detected current value is smaller than the specified value (when the abnormality detection signal of the drive abnormality detector 16 is input to the controller 19), the controller 19 controls the supply / discharge solenoid valves 5a and 5b. The valve opening command is canceled, and both the supply / discharge solenoid valves 5a and 5b and the exhaust solenoid valve 6 are closed. As a result, the air chambers 1a, 1b, 2a, 2b are not electrically connected to the compressor 4, and even if the compressor 4 does not start normally, the compressed air in the air chambers 1a, 1b, 2a, 2b flows backward in the direction of the compressor 4. As a result, the vehicle height will not drop.

[0019]

[Effect of the device]

 As described above, according to the present invention, the drive abnormality detector is provided in the motor drive circuit, and when this detection signal is input to the controller when the vehicle height rises, the controller cancels the valve opening command to the solenoid valve for supply and discharge. Therefore, when the compressor does not start normally due to a break in the motor drive circuit or a drop in the battery voltage, the air chamber and the compressor do not conduct, and the vehicle height does not decrease.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional technique.

[Explanation of symbols]

1a, 1b, 2a, 2b ... Air chamber, 3 ... Passageway, 4 ... Compressor, 5a, 5b ... Supply / discharge solenoid valve, 8 ...
Motor, 11 ... Motor drive circuit, 12 ... Power supply section, 16 ...
Drive abnormality detector, 19 ... Controller.

Claims (1)

[Claims for utility model registration] 1. An air chamber of an air suspension device, an air compressor for supplying compressed air to the air chamber, a motor for driving the air compressor, a discharge side of the air compressor, and the air chamber. A supply / discharge solenoid valve that opens and closes a communication passage, a drive abnormality detector provided in the motor drive circuit, an ON command and a valve open command for the power supply unit of the motor drive circuit and the supply / discharge solenoid valve when the vehicle height rises. And a controller for canceling a valve opening command to the supply / discharge solenoid valve when an abnormality detection signal from the drive abnormality detector is input.