JPS59110933A - Abnormality indication circuit of control device for variable damping force type hydrostatic buffer - Google Patents

Abstract

PURPOSE:To indicate an abnormal state to an operator correctly with a construction of less circuit elements by making use of selected position indicating lamps of a damping force setting changeover switch for indicating an abnormality when the abnormality occurs in a control system. CONSTITUTION:A trouble detection circuit 30 monitors output signal levels of a selection reference signal generating circuit 2 and each signal comparison circuit by time control, and outputs an abnormality detection signal when an abnormality occurs. An abnormality indication control circuit 32 is given an abnormality detection signal from the trouble detection circuit 30, and thereby driven to switch on and off damping force indication lamps 1H, and 1N, 1S. On the other hand, among indication lamps 1H, 1N, and 1S, those selected by a damping force setting changeover switch 1 are continuously lit, and consequently, remained indication lamps are switched on and off by the abnormality indication control circuit 32. This construction permits to indicate the selected position of the present changeover switch 1 and the occurrence of an abnormality at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control abnormality display circuit in a control device for a variable laying force type hydraulic plate breaker installed between a vehicle body and an axle of an automobile or the like.

Conventionally, in order to improve the riding comfort and running safety of automobiles, etc., a motor inside or outside the piston rod is rotated by a predetermined angle depending on the driving situation in front of the moving vehicle. By climbing up the rotating car and controlling the rotation of the adjustment element for adjusting the release force, the damping force variable hydraulic shock absorber and this hydraulic pressure shock absorber can be controlled to achieve the desired damping force p+1i'i. A control circuit (hereinafter referred to as a "control circuit") for this purpose is known. An overview of such a conventional control circuit.

The overall structure of the present invention will be explained using the block diagram shown in FIG. 1 and the #I relative of the hydraulic shock absorber shown in FIGS. 2 and 3.

In Fig. 1, ■ is a changeover switch for selecting one of the desired damping force setting positions (in this conventional example, each damping force setting position is divided into three categories: high, medium, and low), and 2 is this changeover switch. A selection reference signal generation circuit receives one selection signal selected by switch 1 and generates a selection reference signal in accordance with the selection signal; 3 is a selection reference signal output from this selection reference signal generation circuit 2, which will be described later. A signal comparison circuit 5 compares the output signal corresponding to the rotational angular position of the motor 4 to determine whether the selection reference signal and the output signal are inconsistent or coincident. This is a motor drive circuit that is activated in response to various signals, and has current limiting performance in case of motor short circuits.

Reference numeral 4 denotes a motor driven or stopped by the motor drive circuit 5, and 6 detects the rotation angle position of the drive shaft 4a of the motor 4, and outputs the detected value to the signal comparison circuit 3. This is a rotation angle position detection circuit that inputs an output signal corresponding to the rotation angle position. In addition, when this rotation angle position detection circuit 6 is equipped with a predetermined encoder, the contact signal output from this detection circuit 6 is converted into a digital signal as shown in this conventional example. A signal conversion circuit 7 for outputting an output signal to the signal comparison circuit 3 must be provided between the rotation angle position detection circuit 6 and the signal comparison circuit 3.

The control circuit S (configured as described above) is adapted to rotate the regulator 8 provided in the hydraulic shock absorber T shown in FIG. 2 by the motor 4.

That is, in FIG. 2, 9 is a cylinder fully filled with hydraulic fluid, and 10 is a piston rod that extends through the cylinder 9 with one end sealed and the other end sealed. 11
A piston is slidably inserted into the cylinder 9, and the piston 11 divides the inside of the cylinder 9 into two parts, an upper liquid chamber 12 and a lower liquid chamber 13. This piston 11 includes the upper and lower liquid chambers 1.
A damping force generating means 14 is provided which generates a flow resistance in the hydraulic fluid used for the metal displacement operation between 2 and 13.

15 is a generally cylindrical stud that connects the piston rod 10 and the piston 11;
Inside, there is an adjuster housing section 16 and an adjuster housing section 16.
an axial through hole 17 that communicates between the inside and the lower liquid chamber 13;
are formed respectively. Further, as shown in FIG. 3, the cylindrical wall portions 15 a K of this stud 15 are arranged in open communication with the upper liquid chamber 12 and have mutually different opening areas and are spaced apart at a constant interval of n in the circumferential direction. Each orifice 18, 19, 20 is bored.

The motor 4 accommodated in the hollow part of the piston rod 10 is located in the holder part 16 of the njJ stud 15.
An IAI armature 8 which is rotationally driven by is rotatably housed in the barb 8, has an axial through hole u1 that opens and communicates with the lower S&chamber 13, and this through hole 22 and the aforementioned Each orifice 18, 19 provided in the stud 15...
・Communication holes n that can selectively communicate with any one of the above are formed respectively.

The input end of the motor 4 is connected to a constant bar drive circuit 5, and the motor 4 is driven by this motor drive circuit 5.

According to the configuration of the control circuit S and the hydraulic shock absorber T as described above, the vertical movement of the piston rod 10 accompanied by the piston 11 causes the penetrating oil passage 5. The upper part 1. By displacing and flowing the working fluid between the lower fluid chambers 12 and 13, the desired damping force can be fully ensured.

On the other hand, depending on the driving conditions of the car, etc., the damping force can be set at any desired position, such as the medium (normal) damping force setting as shown in this example! When all selections are made and the changeover switch 1 is switched, a selection reference signal corresponding to the selection signal from the changeover switch 1 is outputted from the selection reference signal generation circuit 2. This selection reference signal is connected to a signal ratio soft circuit 3 (9), and this comparison circuit 3 receives, in addition to the selection reference signal, a signal from a rotational angle position detection circuit (6) to a drive shaft installed in the motor (4). 4
Since the rotational position detection signal indicating the current rotational angular displacement f of a is converted into a digital value and input to the signal conversion circuit 7, these two signals are input to the signal comparison circuit 3.
compared in.

In this signal comparison circuit 3, if the two signals match, a match signal is output, and if they do not match, a mismatch signal is output. Therefore, the motor drive circuit 5 is operated by each of these signals. That is, when the match signal is input to the motor drive circuit 5, the supply of drive current from the motor drive circuit 5 to the motor 4 is stopped, and therefore the rotation of the motor 4 is stopped. On the other hand, when a mismatch signal is input to the motor drive circuit 5, a drive current is supplied from the motor drive circuit 5 to the motor 4 in accordance with this mismatch signal, and the previous HU2'M comparison circuit The rotation of the motor 4 continues until the output signal from the motor 3 becomes a match signal. In this way, the communication hole of the adjuster 8 is brought into open communication with the orifice 19 provided in the stud 15 for setting the medium damping force selected by the changeover switch 1. Therefore, by bypassing a portion of the working fluid flowing between the upper and lower liquid chambers 12 and 13 through the orifice 19, the damping force obtained by the reducing force generating means 14 can be reduced. Adjustments can be made to ensure the full desired damping force.

By the way, when an abnormality occurs in the control system of the valley hydraulic shock absorber, for example, when an abnormality occurs such as inability to drive the motor 4, disconnection of the harness, malfunction of the rotation angle position replacement output W66, etc.
The depressing force adjustment position may be different between a hydraulic shock absorber controlled by an abnormal control system and a hydraulic shock absorber controlled by another healthy control system. for example,
The hydraulic shock absorber of a healthy control system may be left in the soft position (based on the setting of switch l) (the hydraulic shock absorber of an abnormal control system is set to the hard position even though it is set to the 81 position).

In this case, the damping forces of all the hydraulic shock absorbers are not equal, so
Driving stability deteriorates.

It is desirable to promptly and reliably detect and display such abnormalities in the control system so that the operator, such as the Ministry of Operation, can forgive them.

The present invention uses a change-over switch's damping force selection position indicator light to indicate the current level when an abnormality occurs in the control system, and this abnormality display also has the function of indicating the change-over switch's selection position. The overall structure of the present invention is shown in FIG. 1 to provide an abnormality display circuit which has a structure based on the number of times X and can accurately inform an operator of abnormal conditions.

In the same figure, the failure detection circuit 'Nr30 monitors the output signal levels of the selection reference signal generation circuit 2 and each signal control circuit 3 by time management, and at least one of these output signal levels is in a steady state of high level 4. When going to the low level, time monitoring is started by switching the changeover switch 1 and starting driving the motor 4, and when the time until the output signal level returns to the low level v-low level exceeds the set time, the damping force is applied. A high-level abnormality detection output is obtained as a leg abnormality (system abnormality), and this output is maintained when the system malfunction is stopped, such as by turning off the ignition switch.

The damping force switching signal generation circuit 31 obtains a signal output that forces the selection basic signal generation circuit 2 to the output i N (NORMAL) position by being given the abnormality detection signal from the failure detection circuit side.

These failure detection circuits and damping force switching signal generation circuits 37 detect system abnormalities by monitoring the time from the start of damping force adjustment to completion, and furthermore, when an abnormality is detected, a healthy control system is forced to return to the normal position. to minimize the difference between the damping force in the abnormal control system and the damping force in a healthy control system.

The abnormality display control circuit 32 turns on the damping force indicator lII by receiving the abnormality detection signal from the failure detection circuit I.

IN, is f blinking drive. Indicator light 1B, IN, 1
Reference numeral 8 is provided for each self-reducing force selection terminal of the changeover switch 1, and when the corresponding terminal is grounded according to the selected position of H, N, or 8 of the changeover switch 1, a continuous lighting circuit for the corresponding indicator light is established. It is formed. In contrast, the abnormality display control circuit 32
When an abnormality occurs, all indicator lights will blink completely. As a result, the indicator light I11. ls and 1g are selected by the changeover switch 1 and are lit continuously, and the remaining indicator lights are blinked by the abnormality display control circuit 32, and the current changeover switch 1
Displays the selected position and the occurrence of an error at the same time.

FIG. 4 shows an example of the failure detection circuit (equipment), the trial force switching circuit number generation path 31, and the abnormality display control circuit 32? show.

Between the failure detection circuits are NOR gates GI and G! used as inverters. and a clock pulse generation circuit constituted by a peripheral CR resistor, and a two-stage cascaded counter ONT□ that totals the output pulses of this clock pulse generation circuit.
,C! G! (!:, this and gate G
The AND gate G4 detects the low level output of ++ or the low level signal output from the selection reference signal generation circuit 2 when the selector switch 1 is switched, and the low level output of this AND gate G4 or the differential circuit of 00 and RO. The OR gate G5 detects the low level output at the start of system operation and resets the counters O, NTl, 0NT3i to start their counting operation, and the time setting digit Q2 output of the counter 0NT2 or the output of the digit higher than the digit Q2. OR gate G that detects digit Q3 output at high level
It consists of 6. In addition, the counter 0NT1.0NT2
When a low level is applied to the reset terminal R, the contents 'k +) are set, and timekeeping is possible if the low level continues to be applied, and the timekeeping stops when the low level returns to the high level. In addition, the counter 0NT2 is enabled (El) for its counting power, and the output of Q3 digits is given to the clock terminal (0), and the counting is stopped in which the output of 911 digits continues at a high level. 'NT2
The time required to count up to the Q2 digit is set as the set time for abnormality detection, and the Q3 digit is the time required to control the reducing force of a healthy control system to the normal (N1 position) by abnormality detection, that is, Q2i. It is set to the time required for counting from the high level to the high level of 95 digits.The Qs digit output is triggered by the stop command signal of the OR gate configured system stop circuit provided between each comparator circuit 3 and the drive circuit 5. .

The damping force switching signal generation circuit 31 is partially shared with the output stage of the selection reference (II signal generation circuit 2), and the comparison signal output stage of the first signal generation circuit 2 is made into an OR gate G7, Gs and its input is , and the position signal of the changeover switch 1 as well as the output of the OR game (Gs) between the failure detection circuits. The selection reference signal generation circuit 2 selects the damping force setting position H (H
ard), N (Normal), S (Soft)
A low level (Ll) is given to the selected input among each terminal input of
The inputs are the diode D1 for preventing rotation υ, respectively.
D! It is input to one of the gates of the OR gate G7 and Gs via the CRs circuit for noise removal, and the input at the setting position N is input to one of the gates of the NOR gate G9 via the bypass prevention diode D8 and the ○R sorting circuit. Furthermore, diodes D4 and D5 are provided in the forward direction from the input terminal at the set position N to the input terminals at the closed positions H and S. The selection criterion generation circuit 2 with this configuration has damping force setting positions H and N of the changeover switch 1.

In addition to obtaining the 2-bit output from OR gate G7 and Gs according to S, the
. As a result, when the changeover switch 1 is switched, the counter 0NT1 between the failure detection circuits is
．． Return the contents of 0NT2 to the initial state. Also, after the changeover switch l is turned off, the diode D+1 y D4 p D
! By l, the human power of Noah Gate G9 is set to low level regardless of whether it is in the H, N, or S position, and the counter 0NTl
.

All counts of 0NT2 are allowed. The other input of this NOR gate G9 is given the output of the OR gate G6 of the faulty side output circuit, and when an abnormality in the control system is detected, the output of the NOR gate G9 is held at a low level.

In such a configuration, when changing the damping force from the current one by switching the changeover switch 1, the output of the signal comparison circuit 3 becomes a mismatch output (low level) at the start of the control operation, and the counter ONT, 0NT2 of the failure detection circuit blade is output. When counting is started and a matching output is not obtained from each comparator circuit 3 within the time required for the counting to bring the G2 digit to a high level!
The abnormality of II is detected, and this detection output is passed through OR gate G6 and given to gates 07 to G9, and gate G7
゜Forcibly set the Ryokawa force of G8 to high level, set the selection standard A word to the normal position (Nl, and set the output of gate G to low level to continue counting of counters ONT, 0NT2. Each comparison Since the selection reference signal is set to the normal position, the circuit 3 outputs the full drive signal based on the discrepancy output so that the damping force is set to the normal position, and controls the damping force of a healthy control system to the full normal position.After this control is completed, , a high level is obtained from the Q3 digit output of the counter 0NT2, the counting of the counter 0NT2 is completely stopped, and the Q3 digit output is held at the high level.
All inputs are forced to high level to stop the motor drive including the abnormal control system.

The abnormality display control circuit 32 includes a fault detection circuit blade (Dke hGs output and counter aNT, tvQs digit output as gate inputs), and this Nantes gate 32A, which is inverted with the output of 32A as input. An anode is connected to each input terminal of the selection reference generation circuit 2, which is connected to the buffer circuit 32B that obtains the output and each selection position terminal H, N, and SK of the changeover switch, and the cathode is commonly connected to the output terminal of the buffer circuit 32B. and a diode circuit 320 connected to the diode circuit 320.

The indicator light IN, 1g, is is a light emitting diode or a light bulb, and each diode or light bulb is connected in series with a limiting resistor.

In such a configuration of the abnormality display control circuit 32 and the indicator light circuit, the failure detection circuit blade detects a failure and the gate Go
If the counter ONT continues to output a high level, the counter ONT is still in counting operation, so the Nant gate 32
A obtains an output obtained by inverting the output (constant periodic pulse) of the counter ONT, and this output passes through a buffer circuit 32B and periodically grounds each diode of the diode circuit 32c. As a result, among the indicator lights IH, in, and ls, the one in the position selected by the changeover switch 1 is lit continuously, and the remaining indicators are blinked by the output of the buffer circuit 32E.

As is clear from the above description, in the present invention, when an abnormality is detected in the control system, the indicator light for indicating the selected position of the changeover switch is used to indicate the abnormality by flashing, and the selected position of the changeover switch is lit continuously. Since the information is displayed using an indicator light, there is no need to worry about using an indicator light dedicated to displaying abnormalities, and the function of indicating the selected position of the changeover switch can also be ensured. The circuit structure g for abnormality display uses all the periodic pulses that the failure detection circuit waits for, so it can be realized with a low-cost circuit with a relatively small number of circuit elements.

[Brief explanation of the drawing]

Fig. 1 shows the entirety of the present invention [Fig.
The sectional view taken along the line II and FIG. 4 are circuit diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Selector switch, 2... Selection reference signal generation circuit, 3... Signal comparison circuit, 4... Motor, 5... Motor drive circuit, 6... Rotation angle position detection circuit, ( 9)
... Failure detection circuit, 31 ... Damping force switching signal generation circuit, 32 ... Abnormality display control circuit, 33 ... System stop circuit, 0NTl. 0NT2...Counter, 32A...NAND circuit, I
N. 1n, ls...indicator light.

Claims (1)

[Claims] A changeover switch selects the desired damping force, and the damping force command signal selected by this changeover switch is compared with the rotational angle position signal of the motor that fully adjusts the damping force of each hydraulic shock absorber to determine the hydraulic pressure. In a control device equipped with a control circuit for controlling the shock absorber to a desired damping force, an indicator light is provided for each damping force selection terminal of the changeover switch, and one indicator light is provided depending on the reducing force selection position of the changeover switch. A power reduction indicator light circuit in which the indicator light is selectively turned on, and a detection signal indicating that an abnormality has occurred in the control of the hydraulic shock absorber causes each of the above indicator lights to blink in parallel with the selective lighting by the changeover switch. and an abnormality display control circuit that displays an abnormality by blinking the remaining nine indicator lights except for one indicator light that is selectively turned on by the changeover switch when a hydraulic shock absorber control error occurs. Abnormal Ibaraki circuit of the control device for the variable force hydraulic shock absorber.