JPS59140113A - Troublesome-operation prventing circuit for variable damping force type hydraulic shock absorber - Google Patents

Abstract

PURPOSE:To eliminate the troublesome operation of a switch and resolve erroneous operation by adding a complicated signal preventing circuit from which a switching signal is not output unless the switching signal supplied from a switch for selecting a damping force is input for at least a set time. CONSTITUTION:The captioned controller S is equipped with a damping-force selection signal generating circuit 36 which receives the signal of a switch 31 for selecting damping force and outputs a signal corresponding to said damping force, signal level conversion circuit 38 into which the signal of a valve position sensor 44 installed on a motor 4 for adjusting damping force is input, and an input signal comparison circuit 37 in which the outputs of the both circuits 36 and 38 are compared. A motor driving circuit 39 is controlled according to the deviation obtained in the circuit 37. In this case, a complicated signal cancelling circuit 35 is installed between the switch 31 and the above-described signal generating circuit 36. Said circuit 35 is constituted so that only the signal input continuously for a set time among the signals supplied from the switch 31, car- speed sensor 33, and a car-height displacement sensor 34 is output.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control sieve circuit for a damping force modified hydraulic shock absorber, which is installed at the intersection of a vehicle or the like and an axle, and particularly relates to a control sieve circuit for a damping force modified hydraulic shock absorber. Note: This relates to a circuit system that prevents manipulation.

Conventionally, in order to improve ride comfort in front of a car or driving stability, a reed inside the piston rod or a motor outside the piston rod is rotated by a predetermined angle depending on the driving conditions of the car, etc., and the rotational force is used to reduce the By controlling the rotation of the force adjustment adjuster, the desired loading force can be adjusted. (i11 circuit (hereinafter referred to as "control circuit") is known. Figure 1 is a block diagram showing an overview of such a conventional control circuit, and Figure 2 is a block diagram showing the outline of such a conventional control circuit. FIG. 2 is a cross-sectional view showing the configuration of a hydraulic shock absorber.

Therefore, an outline of a conventional control circuit and a hydraulic shock absorber will be explained based on FIGS. 1 and 42.

In Fig. 1, 1 is the setting position of the damping force of nr (in this conventional example, one of the damping force setting positions of each g divided into three categories, hard, normal, and soft) is selected. switch (in this conventional example, a switch circuit equipped with a rotary one-way type changeover switch 1a; 2 is a switch circuit that receives one selection multiplier selected by this changeover switch 1 and digitizes the selection signal according to the selection signal); A selection reference signal generation circuit 3 that generates a reference signal compares the selection reference signal outputted from the selection reference signal generation circuit 2 with an output signal corresponding to the rotation angle position of the motor 40, which will be described later, and determines these selection criteria. A signal comparison circuit 5 determines whether a signal and an output signal are inconsistent or coincident, and reference numeral 5 is a motor drive circuit which is operated in response to each signal, which is either a disagreement or a coincidence, output from the signal comparison circuit 3.

4 is a motor driven or stopped by the motor drive circuit 5, and 6 is an output corresponding to the rotation angle position of the drive shaft 4a of the motor 4 to the signal comparison circuit 3, using the rotation angle position of the drive shaft 4a of the motor 4. This is a rotating P4 stable position detection circuit that manually generates a signal. In addition, when 7 is composed of the rotational angle position detection circuit 6 or a predetermined machine/coder, this detection circuit 6
This is a 1g @ conversion circuit for converting contact No. 15 outputted from the converter into a digital signal and outputting output No. 16 to the signal comparison circuit 3, and between the rotational angle position detection circuit 6 and the signal comparison circuit 3. It is set in.

The motor 4 constituting the control circuit S configured as described above rotates the regulator 8 provided at the hydraulic pressure buffer <=T shown in FIG.

That is, in FIG. 2, 9 is a cylinder filled with the TJIJJ liquid, and 10 is a piston rond that extends through the cylinder 9, which is sealed at one end, with the other end sealed in a liquid-proof manner. A piston 11 is slidably inserted into the cylinder 9, and the piston tiIC separates the inside of the cylinder 9 into an upper liquid chamber 12 and a lower liquid chamber 13. This piston 11 is provided with a damping force generating means 14 for creating a flow resistance in the hydraulic fluid that clamps the lower valley liquid chamber 12.13To'l.
ノ1d is given.

Reference numeral 15 denotes a generally planar stud that connects the piston rod 10 and the piston 11;
Inside, there is an adjuster accommodating portion I6 and an adjuster accommodating portion 16.
Through-holes 17 in the L-law direction are formed to communicate between the inner part and the front part liquid J3. Also, this stud 1
As shown in Figure 3, the IWI wall t'A Jb a of No. 5 has different openings 1 that communicate with the upper liquid M+2.
Valley orifices 18, 19, and 211 are floatingly arranged by straightening the required 181 holes in the circumferential direction with a hammer.

An adjuster 8 rotatably driven by a motor 4 housed in the inner wall of the piston rod 10 is rotatably housed in the adjuster housing part [6 of the stud 1b. is selected from either a through hole z2 in the i direction that communicates with the lower acid chamber (3), and each of the orifices 18, 1, 9, etc. provided in this through hole 22 and the stud I5. Communication holes 23 that can communicate with each other are formed respectively.

The input end of the motor 4 is connected to a predetermined number of harnesses 24.2.
4 to a motor drive circuit 5 as shown in FIG. 1, 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 1° accompanied by the piston 11 causes the through-oil passage 25 that constitutes the damping force generating means 14 provided in the piston/11 to The upper and lower trough liquid chambers 12 receive resistance from the springing force of the pulp plate 26.26 which closes one open end of each of the through-oil passages 26.25. The desired damping force can be ensured by flowing the hydraulic fluid at the .13 opening position.

On the other hand, depending on the driving situation in front of the vehicle, if you select a stand-up position where the damping force is set, for example, a medium damping force setting position as shown in this example, and change the changeover switch 1a, the changeover from the changeover switch 1a A selection reference signal corresponding to selection No. 1g is output from the selection reference signal generation circuit 2. This selection reference signal is connected to a signal comparison circuit 3, and this comparison circuit 3 receives, in addition to the selection reference signal, a signal from a rotation-# degree position detection circuit 6 provided in the motor 4. Since the rotational position lIt indicating the current rotational angular position of the drive shaft 4a is converted into a digital value by the borrowing signal signal conversion circuit 7 and input manually, these two 1G signals are input to the signal ratio soft circuit 3. are compared. In this signal comparison circuit 3, if the two signals match, a match multiplier is output, and if they are negative, a negative signal is output. Therefore, these/? ! r(ig), the motor 1g drive circuit 5 is activated. In other words, if a coincidence signal is input to the motor drive circuit 5, the drive current is supplied from the motor drive circuit 5 to the motor 4. is stopped;
Therefore, 40 rotations of the motor are 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, so that the previous 1 d
The rotation of the motor 4 continues until the output signal from the No. 1g comparison circuit 3 becomes a match No. 1g. In this way,
The communication hole 23 of the al'j'ttf element 8 opens and communicates with the orifice 19 provided in the stud J5 for medium damping force installation selected by the changeover switch 1. For this reason,
H1I upper and lower valley liquid chambers 12.131MJ are installed Mυ
By passing a part of the hydraulic fluid flowing through the IL through the front ml orifice 19, the damping force obtained by the front six self-destructive force generator stage 14 is adjusted, and the
It is possible to secure the desired fall reducing power.

A changeover switch 1a that determines the lifting platform of the above configuration and the strength of the lift
The operating state of the control circuit S is changed by the switching operation, and the factors that determine the damping force are considered to be vehicle speed and vehicle height displacement. In other words, when driving commercially, it is necessary to lower the vehicle height and increase the damping force of the hydraulic shock absorber to improve the stability of the vehicle.On the other hand, when driving on rough roads and raising the vehicle height, it is necessary to lower the vehicle height to improve vehicle stability. The solution is to reduce the damping force of the hydraulic shock absorber. These vehicle speed and vehicle weight displacement are measured by a vehicle speed sensor, respectively.
4. A circuit means for determining the damping force by sensing with a displacement sensor in addition to the previous i selection criterion i= signal generating circuit 2 has also been considered; however, according to such a circuit means, the damping force cannot be determined. The following factors are included: a selector switch that selects one of the three damping force setting positions (medium and low), vehicle speed 1g obtained by the vehicle speed sensor, and vehicle height displacement obtained by the vehicle height displacement sensor. There is a problem in that the damping force adjustment motor is driven by the fluctuation of the stiffness of each signal, and that the operation becomes a core axis and causes malfunction.

In other words, if there is a play due to rapid fluctuations in factors, the operation of the motor 4, which is the actuator often used in the installed car, becomes unstable, causing malfunctions near the cut-off point. However, there is a disadvantage in that the changeover switch must be operated frequently depending on the vehicle condition.

The present invention has been made in view of the above, and is a device that eliminates the various drawbacks of conventional devices, eliminates the complicated operation of the wave-reducing force changeover switch, and eliminates malfunctions near the damping force changeover. The purpose of this is to provide a damping force change with a complicated signal prevention circuit that prevents the switching signal from being output unless the switching signal is manually operated for more than one time. We are looking for an electronic control device for hydraulic shock absorbers.

Hereinafter, referring to FIGS. 4 and 5 regarding the embodiments of the present invention,
I will explain. First, FIG. 4 shows the entire control circuit S, and 31 is a changeover switch for the user to arbitrarily select the damping force, and this switching state is displayed on the damping force indicator 32. . As will be described later, the damping force indicator light 32 is also designed to blink in order to function in the event of a failure. 33 is a vehicle speed sensor; 34 is a vehicle height displacement sensor, and their respective signal outputs are manually inputted to the troublesome signal canceling circuit 35 together with the output of the damping force switch 31 described in III. The troublesome signal canceling circuit 35 is located at a stage before the first damping force selection signal generating circuit, and its structure and operation are shown in FIG. 5, and a detailed explanation will be given later.

36 is a mounting force selection signal generation circuit which receives the signal output from the damping force changeover switch 1, converts it into a signal corresponding to the damping force, and outputs it in 2 bits. Table 1 shows an example of the output signal.

Dragon 1 H is HA, HD, N is NORMAL, S is 5
Indicates OFT.

Reference numeral 37 is a human power signal ratio conversion circuit, which receives the signal E from the signal level conversion circuit 38 corresponding to the power reduction power selection No. 16 party raw circuit J and the motor 40 rotation angle position 14, which will be described later. It is calculated whether or not the kana signal is more sensitive to the signal, and if they match, H' is output, and to Kusuke who does not match, the signal II L II is output. 59 is motor 1
This circuit controls the output to drive the motor 4 and stop the motor 4 in response to the S signal from the human power signal ratio soft circuit J7.It also controls the output to drive the motor 4 and stop the motor 4 in response to the signal from the human power signal ratio soft circuit J7. 41 is a damping force switching No. 1n generation circuit, and ii. It works to separate the signals. That is, when it receives the "Hlgh" signal from the failure detection circuit 40, it disconnects the damping force changeover switch 31 and newly changes the damping force to "NOR".
The failure detection circuit 40 is a circuit that monitors the output No. 4J level of the power reduction selection signal generation circuit 36 and the human power No. 14 comparison circuit 37 by time management, and The master level is °“fIi
gh” means that you are in a steady state,
"LOW" means that the switch is changed or the motor 4 is being driven, and is in a state of direct control. Therefore, even if the time of °'Low'' is exceeded within a certain period of time, for example, for more than 3 to 4 seconds, °'
If it does not become H1gh, it issues a signal as a system abnormality and operates to maintain that state until the operator turns off the ignition switch.42
is an indicator light drive circuit, and one of the failure detection circuits 40
In response to signal d, the rent reduction power indicator light 32 blinks. At this time, indicator lights other than the indicator light displaying the selected damping force are made to blink. 43 is a first current limiter circuit, which continuously monitors the output -DIL of the motor drive circuit 39 for each output to prevent the output current from exceeding a single value, for example, about 300 mA, This is to protect the drive circuit and /.--failure in the event of an output short circuit. On the other hand, the motor 4 is equipped with a pulp sensor 44 which detects the rotational position of the drive shaft 4a of the motor 4 and outputs a 2-bit ON-OFF signal to the signal level change circuit 38. Output as a contact signal.45
This is a pulp unit that opens and closes in a modified hydraulic pacifier.

Among the above circuit configurations, the troublesome signal canceling circuit 35, which is the main component of the present application, will be explained based on FIG. 5. That is, the troublesome signal canceling circuit 35 is inserted at 1!1 between the reducing force changeover switch 31 and the discharging force selection number generating circuit 3b, and its circuit configuration is as follows: gate circuit M4.
6. Signal record (intention circuit 47. Level sense circuit 48
．． It consists of a timer circuit 49. The individual circuit functions will be described below. The gate circuit 46 receives a human power signal from the damping force changeover switch 31 and a vehicle speed signal input 33',
In response to the vehicle displacement input '34', the signal/membrane circuit 47
The gate is used to output each human input signal to each gate, and the gate is turned on or off by output No. 18 of the timer circuit 49, which will be described later. The gate of the gate circuit 46 opens when the output of the timer circuit 49 is H1gh'. The signal recording/missing circuit 47 is for reading the signal output when the gate circuit 46 is open and outputting the signal to the installation force selection signal generation circuit J6.
After the gate circuit is closed, H+ti 1a is turned off and the initial signal is maintained until a new signal is output. The level sense circuit 48 has the damping force 1;
IJ s switch 31. Vehicle speed 1.4 Human power 33', 4
It produces 4% of the novels with a high level of 4 and a level of 3.1', for example (a certain power cutter is
When in the ARD, NORMAL, and blOPT positions, the "'Low" signal is output once by the timer.
When the damping force selector switch 31 is in the reverse position, it outputs a signal of 'H1gh' to the timer circuit 49.The timer circuit 49 is a level sense circuit. The output of 48 is configured to count at L0w'' and reset the count at "H1gh." Therefore, unless the ``TJOW''<= signal output is continuous for a certain period of time, a signal to open the gate circuit 46 will not be output.

Other input signals are single signal input 33', car change fM,
The same applies to the Hakugo human power 34', and the timer circuit 49 counts while the signal human power is maintained at a certain level, and if the level is fluctuating, the count is reset, so the gate circuit 46 The opening and closing of the damping force changeover switch 1 is controlled by the operation of the damping force changeover switch 1.
be done.

The troublesome operation prevention circuit of the 0J1 device for the variable force hydraulic softener of the present invention described in detail above has a signal terminal and an input terminal for changing the damping force of the ash reduction force changeover switch, etc. The configuration is characterized by the insertion of a nuisance signal canceling circuit in the middle of the attenuation force selection signal @ generation circuit, and the nuisance signal canceling circuit outputs only signals that have been manually input continuously for a certain period of time or more. Because of the circuit configuration, the following operational effects are achieved. In other words, in the past, the vehicle speed fluctuated depending on the running condition of the vehicle, or the damping force of the hold pressure shock absorber was changed due to changes in the military, etc., and the setting of the preset load reducing force switch was set upright. However, based on the above-mentioned factors, the operation is reduced by 10%, and under normal conditions, the operation becomes slow and complicated, and the damping force adjustment actuator is unable to follow suit and malfunctions. If there is a problem, or you have to operate the power reduction switch in a hurry.
However, in the case of the present invention, the switching signal is not output unless the signal for switching the damping force is continuously input for a certain period of time or more. This has the great advantage that the signal to the actuator is stabilized, and there is no need to get used to the actuator causing malfunction, and there is no need to perform complicated operations on the damping force switch.

For the damping force fluctuation enshrinement of the front dpi vehicle speed signal or vehicle control signal temple,
Since there is a so-called dead zone in the middle of switching and the timer circuit does not operate, the switching operation is stable and reliable. It is something that is adopted to bring about the old and young.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional damping force variable type European pressure damper restraining circuit, Fig. 2 is a sectional view of main parts showing the configuration of a damping force damper, Fig. 3 is a 4 is a block diagram showing an embodiment of the control circuit according to the present explanation, and FIG. 5 is a block diagram showing details of the troublesome signal canceling circuit shown in FIG. 4. It is. 31... Damping force selection switch, 33... Vehicle speed sensor,
34 Car l1iFi displacement sensor, 35... Complicated signal cancellation circuit, 36... Reduction force selection signal generation circuit, 37...
...Input signal ratio soft circuit, 38...Signal level conversion circuit,
39... Motor body circuit, 40 - Failure detection circuit, 4
1... Damping force, switching signal generation circuit, 43... Force IJ transmitter circuit, 44...
Valve position sensor, 45 ・Valve unit, l↓6・
Gate circuit, 47... Signal storage circuit, 48. Level sense circuit, 49... Timer circuit.

Claims (1)

[Scope of Claims] 0) A damping force selection signal generation circuit in which a changeover switch for selecting a desired damping force is connected, and a single signal and a vehicle change noise are manually generated, respectively, and the damping force selection. By comparing the selection output from the signal generation circuit with the rotation angle position detection (J) of the motor for adjusting the force reduction of the modified air pressure reliever, the motor is In a control device that drives the damping force until a predetermined damping force adjustment position of 11 kg is reached, the front dpi (previous stage of the force selection signal generation circuit and the signal human power from the changeover switch, the vehicle speed of 1 g human power, and the vehicle A complicated control device for a variable damping force type hydraulic shock absorber, characterized in that it is provided with a complicated signal cancellation circuit that receives each high displacement signal input and outputs only the signals that have been continuously input for a certain period of time or more. Operation prevention circuit. (2) The nuisance signal canceling circuit is a gate circuit that supplies each signal from the human power signal from the force reduction switch, the vehicle speed signal input, and the vehicle displacement signal input to the signal storage circuit. , a double sign/consideration circuit that reads the output of the gate circuit and maintains the signal, a damping force changeover switch, a vehicle speed signal,
A level sense circuit detects each signal level of the vehicle displacement signal, and receives and counts the output signal of the level sense circuit, and only the count signal that is continuously output for a certain period of time is sent to the gate circuit. 1. A complicated operation prevention circuit for a control device for a variable damping force type hydraulic acid value device as set forth in claim 1, comprising a timer circuit which outputs an output to said gate circuit as a number 1 for 1.