JPS60131309A - Damping force controller for buffer - Google Patents

Abstract

PURPOSE:To aim at improvements in a feeling of driving comfortableness in time of trouble such as disconnection in a signal wire happening, by detecting the consistency or inconsistency between a damping force characteristic indicating signal and a setting state signal being carried out with three stages, and when the inconsistency continues for a specified period, constituting a device so as to stop after rendering the damping force characteristic neutral. CONSTITUTION:Damping force characteristic indicating signals 22-24 and damping force setting state signals 17a, 17b are all compared with one another by each of inconsistency detecting circuits 18-21 and drive a control circuit 62, a motor drive circuit 63... and so on till they are consistent. On the other hand, such voltage 55 as being increased successively is fed to a flip-flop 51 and an inverter 50 via an alteration detecting circuit 30 or the like, and in time of all circuits being normal, a consistent signal 18... is outputted prior to the stated time T2 whereby a motor comes to a stop as the flip-flop 51 is left unset, but when an inconsistent signal continues to be outputted even after the stated time elapses, the voltage 55 comes high enough, causing the flip-flop 51 to be set, and it outputs a stop signal to a control circuit 12 after neutral position setting. With this constitution, abnormal operation due to trouble is checkable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damping force adjustment device for a shock absorber that adjusts the damping force characteristics of a hydraulic shock absorber applied to a vehicle such as an automobile.

When a hydraulic shock absorber is interposed between the vehicle body and the axle, and the shock generated on the axle is attenuated and transmitted to the vehicle body via the shock absorber, the damping force characteristics of the shock absorber must be adjusted depending on road conditions, driving conditions, etc. If it can be set, more comfortable vehicle driving can be achieved. By the way, in a damping force adjustment device in which a damping force characteristics indicating switch is provided on the operation panel of the driver's seat, and a predetermined damping force characteristic is set to the shock absorber by operating this switch, if the indicating switch malfunctions, the indicating switch If the wiring between the damping force characteristic setting state is broken, or the wiring between this detector and the control circuit is broken, etc.
-9°1 Upper 4↓Ii For example, a drive device such as a motor that sets the damping force characteristics of a shock absorber may be in a constantly operating state, which may impede a comfortable ride.

The present invention has been made in view of the above-mentioned points, and its purpose is to provide a vehicle shock absorber that can suppress abnormal operation due to signal line disconnection, etc., and that can ensure a comfortable ride even in the event of a failure. An object of the present invention is to provide a damping force adjustment device.

According to the present invention, in order to attenuate the impact applied to the axle and transmit it to the vehicle body, one end is connected to the vehicle body and the other end is connected to the axle. a buffer that can be freely set to any one of the damping force characteristics, a first detector that detects the setting state of the damping force characteristic of this buffer and outputs a parallel logic signal, and a first detector that detects the setting state of the damping force characteristic of the buffer, and Three switches are operable on the operation panel in the driver's seat of the vehicle, and the signals from these three switches are connected in parallel to the signals output from the first detector so that instructions can be given at will. 1
A signal conversion circuit that converts the logic signal into a signal indicating the damping force characteristics to be set, which is the same as the descendant signal, and a buffer attenuation from the first detector supplied via wiring. What is the setting state of the force characteristics? ;New 11A4? +1dLt
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a second detection circuit that detects each coincidence with the parallel logic signal indicating the damping force characteristic to be set; and a third detection circuit that detects that coincidence is detected in all of the second detection circuits; , a fourth detection circuit for detecting a change in the parallel logic signal from the signal conversion circuit in order to detect a change in the instruction of the damping force characteristic; and a signal from the fourth detection circuit indicating a change in the instruction of the damping force characteristic. A measurement circuit that measures the elapsed time from the occurrence of □ until the third detection circuit detects that all of the second detection circuits have outputted signals indicating coincidence, and A damping force adjustment device for a shock absorber comprising a control circuit that forcibly controls the setting operation of the damping force characteristic for the shock absorber to an intermediate position during measurement, and also operates the same elapsed time measurement circuit again and then stops it. , thus achieved.

Next, a preferred specific example of the present invention will be explained based on the drawings.

The shock absorber 3 that comes off from the cylinder 5, the piston 6, and the piston rod 7 has three stages of damping force characteristics, that is, soft and hard. A passage 13 is formed, the opening degree of which is defined by the rotation of a member 10, and which communicates oil chambers 11 and 12 within the inner cylinder 4 defined by the piston 6. When the vehicle has four wheels with independent suspension, shock absorbers 3 are provided for each wheel. A detector 14 that detects the rotation angle of the rod 9 detects the rotation angle as shown in Table 1 when the member 10 is rotated by the operation of the motor 8 and the opening degree of the passage 13 is set to a value corresponding to soft, hard, and normal. Logic signals 15 and 16 are output. Signal 15 and paths 18 and 19 are fed. Regarding the damping force characteristic indication switches 22, 23 and 24 attached to the hydraulic control panel of the other wheels, the operation of switch 22 gives a hard instruction, the operation of switch 23 gives a normal instruction, and the operation of switch 24 gives a normal instruction. will give instructions to the software. Switches 22, 23 and 24
The instruction signal is sent to the signal line 2 to the IH code conversion circuit 25 of the control device.
6. The signal conversion circuit 25 outputs signals 27 and 28 as shown in Table 2 in accordance with the setting states of the switches 22, 23 and 24.

Signals 27 and 28 correspond to signals 15 and 16 shown in Table 1. The signals 27 and 2L8 are sent via the signal line 29 to the instruction change detection circuit 30. A detection circuit 31 for detecting disconnection of the signal line 29 and a coincidence detection circuit 18.19° m are respectively supplied. The change detection circuit 3o is connected to the switch 2
2.23 and 2.4 operation instructions detect that the damping force characteristic instruction has been changed, such as from hard to normal, normal to soft, or vice versa, and this detection 9 fixed time width T1 is detected. A logic 1 signal 32 having a logic 1 value is supplied to a NOR gate 33. Width TI is resistance 34.35.3
6. In the timer circuit 40 consisting of a transistor 37, a diode 38 and a capacitor 39, the transistor 3
The value is set to be a necessary and sufficient value so that the electric charge of the capacitor 39 is sufficiently discharged due to the conduction of the capacitor 7 and the conduction of the capacitor 39. The detection circuit 31 detects a logic 1 state that occurs at both input terminals 41 and 42 due to the disconnection of the signal line λ9, and upon this detection supplies a logic 1 signal 4□4 to the NOR P-) 43.

The gate 33 is further supplied with a logic signal from the detection circuit 45, so that the detection circuit 45, the detection circuit 18, 19.
One-way detection circuit 18, 19, -=; 20.25 Tahoe'
If a mismatch signal is output from at least one of the detection circuits, a logic O signal 47 is supplied to the gate 33, respectively. □ The output of gate 33 is supplied to gate 43 and P-
A signal from a delay circuit 48 is supplied to the circuit 43 . The output of the gate 43 is connected to the second transistor 3 via the resistor 34.
While the logic 1 signal 49 is being output from the gate 43, the transistor 37 is set to conductive state, no charge is stored in the capacitor 39, and the input and setting of the inverter 50 is A zero voltage signal 52 is supplied to the set terminal of the reset flip-flop 51, and when a logic 0 signal 53 is supplied from the gate 43, the transistor 37 is set to a non-conducting state, and the capacitor 39 is turned off. A signal 53 is sequentially charged from the raw product point t1 via the power supply 54, and a signal 55 whose voltage increases sequentially is supplied to the input of the inverter 5O and the set terminal of the flip-flop 51. When the transistor 37 passes a certain period T1 after the time t1 and remains non-conductive after the time i, and the voltage of the signal 55 exceeds a certain value vR, the flip-flop 51 is set and its ζ output becomes a logic 0, its Q output will be a logic 1, respectively. The ζ output of the flip-flop 51 is supplied to the signal conversion circuit 25 and the display drive circuit 56, and when the signal conversion circuit 25 receives the logic 0 signal 57 at the four outputs of the flip-flop y1, it switches the switches 22, 23 and Regardless of the instruction in 24, it is assumed that normal is specified in the damping force characteristic, and the normal instruction (0, 0) signal 27 shown in Table 2 is applied.
and 28 to force the match detection circuits 18.19, 20.
Outputs 2 bites. When the display drive circuit 56 receives the signal 57, it lights up a failure display element 58 such as a lamp provided on the operation panel of the driver's seat. The delay circuit 48 delays the signal generated at the Q output of the flip-flop 51, that is, the inverted signal 57 by a time slightly longer than the T1+T period, and supplies the delayed signal to the forced stop instruction circuit 59 and the gate 43.

Therefore, after a period of time TI+T* has elapsed since signal 57 occurs, transistor 37 is no longer set to conductive. Inverter 50 operates when the supplied voltage is below a certain value V8, that is, at the value indicated by signal 52 and at time t! In addition, if the value indicated by the previous signal 55 is a logic 1 signal 60, otherwise a logic 0 signal 61 is sent.
is supplied to the forced stop instruction circuit 59. Upon receiving the signal 44 from the detection circuit 31 or the initialization signal (which occurs when the power is turned on, etc.), the forced stop instruction circuit 59 immediately sends a stop signal to the drive control circuit 62, and also sends a stop signal to the drive control circuit 62. Inverter 5 when there is no occurrence
When a signal obtained by inverting the signal 57 is received from the delay circuit 48 while the signal 61 is being received from the delay circuit 48, a stop signal is immediately supplied to the drive control circuit 62, respectively. When the control circuit 62 does not receive a stop signal from the forced stop instruction circuit 59,
- If a coincidence signal is received from the several-sheet output circuits 18 and 19, the drive circuit 63 controls the motor 4 to deactivate the motor 8;
When receiving discrepancy signals from the number 1 and - several sheet output circuits 18 and 19, a control signal is supplied to the drive circuit 63 to operate the motor 8, and a stop signal is supplied from the forced stop instruction circuit 59. When receiving - several output circuit 1
A control signal is supplied to the drive circuit 63 in order to preferentially deactivate the motor 8 regardless of whether match or mismatch signals are received from the motors 8 and 19. The drive control circuit 62 operates in the same way for the drive circuits related to other coincidence detection circuits, for example, the drive circuits 64 related to the several-sheet output circuits 20 and 21. The reset terminal of the flip-flop 51 is connected to the forced stop instruction circuit 5 ? A reset signal similar to the initialization signal supplied to and supplied to is supplied.

(Left below) In the damping force kJ4 adjusting device 70 configured in this way, when the damping force characteristic is instructed hard from the Shinor 1 by operating the switches 22, 23, 24, - several buildings IL! l road 18
．． 19. -20.2 As a result of outputting the mismatch number 47, the change detection circuit 30 (after the disappearance of the i number 32,
Transistor 30 is made non-conductive and flip-flop 5
1 and inverter 50 are supplied with a sequentially increasing voltage indicated by signal 55. If all the circuits are normal, the coincidence detection circuits 1B, 19. are set from normal to hard before the elapse of time T. Consistent signals are obtained from all of the 20 and 2 dyes, and the drive circuit 63 and the 6'jfE'%-tor are stopped, and the detection circuit 45 outputs the signal 46, and the transistor 3 is set to a conductive state. and flip 7
0 Tub 51t: When t is set, the inverter 50 does not output the signal 61. By the way, the drive circuit 63 continues to operate the motor despite the above-mentioned stop, the detection circuit 45 outputs the signal 47 even after time T3 has elapsed, and the transistor 37 is rendered non-conductive. As a result of the voltage of the signal 55 exceeding the predetermined value vB at time t3, the flip-flop 51 is set, and the rising voltage 5o outputs the signal 61. When the flip-flop 51 is set, the display element 58 is turned on to notify the driver of the abnormal condition, and the signal conversion circuit 25 outputs the signals 27 and 28 when normal is set. outputs a coincidence signal, the detection circuit 45 outputs a signal 46, the drive circuit 63 stops the motor 8, and the transistor 37 remains in a conductive state.
Inverter 50 outputs signal 60. after that,
That is, when time t2ρ・et al. (T, +T time elapses,
A signal obtained by inverting the signal 57 from the delay circuit 48 is supplied to the forced stop instruction circuit 59, but when this signal rises, a logic 1 signal 60 is being supplied from the input ζ-2 50, so the forced stop is not executed. The instruction circuit 59 stops (does not supply i) to the drive control circuit 62, and the signal from the delay circuit 48 is supplied to the gate 43, so from time t2 (Tt+
After the lapse of time (T), the transistor 37 is not set to a conductive state.

On the other hand, if both the signals 15 and 16° are always logic 1 due to an abnormality in the detector 14, for example, the time 1. As a result, the coincidence detection circuit 18 continues to output a mismatch signal even after the time TI has elapsed since
Even though the drive circuit 64 stops the motor, the drive circuit 63 continues to operate the motor 8, the display element 58 lights up as before, and the signal conversion circuit 25 outputs the signal 27 when normal is set. and 28, but even in this case, the coincidence detection circuits 18 and 19 output mismatch signals. Therefore, while the detection circuit 45 continues to output the signal 47, the transistor 37 is temporarily rendered conductive by the signal 32 from the change detection circuit 30, and the
The output from signal 61 changes to signal ÷ signal 60 again, and furthermore, at time 1. After a time period of (TI+T!) has elapsed, the state of signal 61 is reached. When the inverted signal of No. 46 and 57 is received from the delay circuit 48 after the state of the signal 61 from the game) 501- occurs, the forced stop instruction □ is stopped. When the signal 29 is disconnected, the detection circuit 31 outputs the signal 44 directly to the drive circuit 63. -6 Yangjiru ~ - Immediately disables Yu.

In the specific example described above, the conversion circuit 25 outputs a signal instructing normal after an abnormality; however, the present invention is not limited to this, and if fl is a signal instructing node, software. may be output. Furthermore, in the event of an abnormality in only the detector 14, the detected amount 31 and the control thereof may be omitted.

As described above, according to the present invention, even if an abnormal operation occurs due to a disconnection of the wiring with the detector or a failure of the detector that detects the setting state, it can be preferably stopped, and an unpleasant riding experience due to the abnormal operation can be avoided. Feelings can be avoided.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a hydraulic shock absorber and a vehicle body, etc., according to a preferred embodiment of the present invention, and FIG. 2 is an electric circuit diagram of a preferred embodiment of the present invention. 3...Hydraulic shock absorber, 18...-Several building output circuit, 51...
...Set reset frizz flop. 11C Renben*-I:l; Muraru

Claims (1)

[Claims] (1) In order to attenuate the impact applied to the axle and transmit it to the vehicle body, one end is connected to the vehicle body and the other end is connected to the axle.
A buffer that can be set to any one of three different damping force characteristics, and a first detector that detects the setting state of the damping force characteristic of this buffer and outputs a parallel logic signal. and,
The fc3 is operable on the operation panel of the driver's seat of the vehicle so that the damping force characteristics to be set in the shock absorber can be arbitrarily specified.
switch, and a signal that converts the signals from these three switches into a signal that is composed of parallel logic signals similar to the parallel logic signal output from the first detector and indicates the damping force characteristics to be set. The conversion circuit and the parallel logic signal indicating the setting state of the damping force characteristics of the wiring device and the parallel logic signal indicating the damping force characteristic to be set in the buffer from the signal conversion circuit are checked ( a second detection circuit for detecting a match, a 3111th detection circuit for detecting that a match is detected by all of the second detection circuits, and a 3111th detection circuit for detecting a change in the damping force characteristic;
a fourth detecting a change in the parallel logic signal from the signal conversion circuit;
The third detection circuit detects that all of the second detection circuits have output signals indicating a match based on the occurrence of a signal indicating a change in the instruction of the damping force characteristic from the detection circuit and the fourth detection circuit. A measuring circuit that measures the elapsed time, and a measuring circuit that forcibly controls the constant movement of the car to an intermediate position by measuring the elapsed time over a certain value. Then, the same elapsed time side again 1 □ 1 1 . -111 and the control circuit that stops the iK that operates the constant circuit.
A shock absorber damping force adjustment device consisting of 1111. A damping force adjusting device for a shock absorber according to claim 1, which comprises a circuit. (Margin below)