JPS5839565A - Steering force controller for power steering gear - Google Patents

Abstract

PURPOSE:To enable a driver to control a steering force depending on the operating condition of a vehicle, by continuously controlling a signal detected correspondingly to the speed of the vehicle, depending on the operating condition. CONSTITUTION:A sensor 11, which detects the moving speed of a vehicle, sends out a pulse signal proportional to the moving speed. The pulse signal is entered into a pulse shaping circuit 12 so that the signal is shaped. The output signal of the shaping circuit 12 is applied to a digital-to-analogue converter 14 through a capacitor 13 so that the signal is changed into an analogue signal corresponding to the moving speed. The analogue signal from the converter 14 is smoothed by a filter 15. The smoothed analogue signal from the filter 15 is conducted to a control circuit 16 and then conducted to a controlling drive circuit 17 which functions to regulate a solenoid valve 18 which is a flow control means. The output current of the circuit 17, which is caused correspondingly to the magnitude of the signal supplied from the control circuit 16 to the circuit 17, is stably applied to the solenoid valve 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-power rudder 1ILII position O steering force control device,
The driver can adjust the steering force according to the driving conditions%0
Ami.

In general, in order to reduce the steering force of an automobile, a vehicle lifting device is used which controls the hydraulic pressure by operating a steering wheel to lift the automobile. In the case of ζO, the steering force is large depending on the single unit (since the steering force is different, the flow rate of oil supplied from the oil pump to the power steering system is changed depending on the driving speed of the car in order to maintain steering wheel operation stability). A steering force control device has been proposed (Japanese Patent Laid-Open No. 52-3142
No. 7, Special No. 81@54-118568).

However, the steering force varies depending on the size of the payload, the slope of the road, the driver's physical strength, etc., but conventionally, only a single steering force characteristic determined depending on the vehicle speed has been obtained.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a steering force control device for a power steering system in which a driver can adjust steering force characteristics according to driving conditions.

In order to achieve this purpose, the device according to the invention,
The signal detected corresponding to the vehicle speed is continuously adjusted according to the driving conditions. Hereinafter, the present invention will be explained in detail with reference to the drawings showing an embodiment. Fig. 1 is a circuit diagram showing an embodiment of the present invention.

In the same figure, a senna 11 that detects the running speed of a car
is designed to output a pulse-like signal proportional to the traveling speed. This signal is sent to the pulse shaping circuit 12 and subjected to waveform shaping. This pulse shaping circuit 12 includes an operational amplifier 128, resistors 121 to 12s, an Mn 12.
The configuration consists of 'gwa', the detection signal of the vehicle speed sensor 110 is connected to the resistor 1
28 and a capacitor 12. After improving the characteristics, the signal is amplified by an operational amplifier 1112t and outputted after 9 seconds. The output good signal is sent to the digital-to-analog converter 1114 via the capacitor 13, and is converted into a nine-anarch signal according to the running speed. This digital
Anag converter 14 wire diode 14. ．． It consists of a capacitor 14□, a capacitor 14, and a resistor 14◆.

A good signal outputted from here is sent to a filter 15 for further smoothing. This filter 15 is an operational amplifier 1115
1. Resistor 15~151, Capacitor 15.

15, and consists of 1. Output 1 from filter 15
The signal is smoothed and converted into an analog signal.
Its magnitude is detected by the sensor 11 and sent to the adjustment circuit 1@ as a signal whose magnitude changes in accordance with the change in the good signal O.

The signal applied to the adjustment circuit 111BK is resistor 1B, t16
The operational amplifier 16 is amplified by a non-inverting amplifier consisting of resistors 161 to 16 m, and is supplied to a control drive circuit 17.The control drive circuit 17 is a flow rate control means for controlling the amount of light of oil supplied from an oil pump (not shown). The operational amplifier 178 controls the electromagnetic pulp 18.
, transistor IT-, 17m, diode 176, capacitor 1T1, resistor 17s~IT%.

It is also configured. 9. Capacitor 19.1 Zener diode 19.1 Resistor 1!1s are used for power supply voltage stabilization and voltage regulation. The control drive circuit 1T receives the signal supplied from the adjustment circuit 16.
! The electromagnetic valve 18 stabilizes the output current according to the
supply to.

In this case, the variable resistor 16 . By adjusting i!, the magnitude of the signal supplied to the control drive circuit 17 changes, and the magnitude of the current flowing through the electromagnetic pulp 18 i! It also changes.

Using this state as a parameter of variable resistance 16.0 change,
FIG. 2 shows the relationship between the current supplied to the electromagnetic pulp 18 and the vehicle speed, which is a factor for determining the magnitude of the input signal O to the control drive circuit 110. In FIG. 2, the horizontal axis V is the vehicle speed, and the vertical axis I is the current flowing through the electromagnetic pulp 18.
A solid line indicates a change in the current flowing through the electromagnetic pulp 18 with respect to a change in vehicle speed. The dotted line indicates that the vehicle speed-electricity fIL characteristic in FIG. 2 corresponds to the variable resistance 16. It shows the range that changes depending on the adjustment. In this case, the adjustment circuit 1@ is the plane**
If it is configured to have the characteristics, electromagnetic pulp 111Kll
The current I generated also exhibits saturation 1a goodness shown in FIG.

Figure 3 shows the oil OR controlled by the electromagnetic pulp 18.
It is a diagram showing the relationship between quantity Q and vehicle speed V, and the solid line is conventionally 0*
The dotted line shows the change in flow rate due to the variable resistance 11isK.
It shows a lot of work. The steering force of a car varies depending on the flow rate of oil supplied from the oil pump.
, as is clear from FIG. 3, the oil flow rate Q is controlled by the driver using the variable resistor 16. By adjusting this, it is possible to avoid a constant rate change below the vehicle speed at which the oil flow rate Q becomes saturated.

As a result, the driver has to select the optimum steering force according to various driving conditions. It can be changed continuously with O being carried out by.

FIG. 4 is a circuit diagram showing the second embodiment, and the same parts as in FIG. 1 are designated by the same symbols. In the figure, the adjustment circuit 16a is composed of resistors 16t-16 and variable resistor 16sK. And variable resistor 16. By adjusting , the magnitude t1 of the signal supplied to the input terminal of the control section IIk circuit 170 can be changed, so that the current that can be interrupted from being supplied to the electromagnetic pulp 18 also changes. In this case, if the filter 15 is %O having saturation 1a characteristics, the electromagnetic valve 180 current ID414 with respect to the vehicle speed V! Figure 5 shows
The oil flow rate QOIIa with respect to vehicle speed V is as shown in FIG. As a result, the oil flow rate was changed to single V6 until the car was shut off.
c It changes proportionally, and at higher vehicle speeds it becomes difficult to obtain a constant oil flow rate. And the oil flow rate is controlled by the variable resistance 16. As shown in the dotted line, the variable resistor 16.
The steering force can be adjusted by

No. 711I is a circuit diagram showing the third embodiment, and No. 711I is a circuit diagram showing the third embodiment.
The same symbols are used for parts that are the same as those in the figure. In the figure, the adjustment circuit tab is connected to a resistor 16. , lli surprise, 164-16,
and a variable resistor of 16 m.

The input terminal of the control drive circuit 17 receives a good signal outputted from the filter 15 and divided by resistors 164 and 161, and a variable resistor 16. The DC voltage adjusted by the DC voltage is added and supplied. Therefore, the current supplied to the electromagnetic pulp 18 is determined by the vehicle speed and the variable resistor 1.
6. A certain amount of current determined by In this case, if the filter 15 is configured to have saturation IEI41 property, the current 1) characteristic of the electromagnetic pulp 18 with respect to the vehicle speed V will be as shown in FIG. 5, and the characteristic of the oil flow rate Q with respect to the vehicle speed VK will be as shown in FIG. As a result, at vehicle speed vlt, the current ■ supplied to the electromagnetic pulp 18 can be changed in proportion to the vehicle speed V, so the oil flow rate Q supplied from the oil pump also changes as shown in FIG. Above the vehicle speed, both the current I and the oil quantity Q remain constant regardless of the change in the vehicle speed. These values can be changed quantitatively by changing the variable resistance 16° at any vehicle speed [as shown by the dotted line]. The steering force can be adjusted by

If the variable resistor 16m is installed near the driver's seat in a position where the driver can easily operate it, the steering force can be easily changed depending on the driving conditions. It will be even more convenient if you write the load status (empty, loaded, etc.) on the dial that adjusts it.

As explained above, the steering force control device for the power steering device according to the present invention continuously adjusts the good signal detected in accordance with the vehicle speed in accordance with the driving conditions. This has the advantage of allowing the driver to adjust the steering force accordingly.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figures 2 and 3 are diagrams showing characteristics of the device in Figure 1, and Figures 4 and 7 are circuit diagrams showing other embodiments. , □Tsuoyo. A1. is number B. 9□91, FIGS. 8 and 9 are diagrams showing the characteristics of the apparatus of FIG. 7. 11...sensor, 14...digital/analog converter, 15...filter, 16...adjustment circuit, 17...control drive circuit, 18...electromagnetic pulp. Patent Applicant Automotive Equipment Co., Ltd. Agent Masaki Yamakawa (and 1 other person) Figure 8 Figure 9 vl v Procedural Amendment (1 Vision 1, Indication of Case 1982 Patent Application No. 137293 2, Invention Name of the steering force control device of the power steering device 3゜Relationship with the case of the person making the amendment Amend the claims on page 1 in a separate sheet. (2) Add the following sentence between lines 11 and 12 on page 8 of the specification. It is preferable to be able to cope with all kinds of operating conditions, but even if it does not reach that level, the adjustment circuit 1
It is also possible to select the characteristics of the adjustment circuit 16 by setting the characteristics of the adjustment circuit 16 in two or three types so that the characteristics of the adjustment circuit 11 can be changed. ”

Claims (1)

[Claims] A sensor that detects the obstruction of the vehicle O and outputs a good signal according to the traveling speed, an adjustment circuit that continuously adjusts the magnitude of the signal according to the driving conditions, and the adjustment VS*O
A steering force control device mounted on a power steering deck, comprising a control drive circuit for driving a flow rate control means for controlling the amount of oil supplied from an oil pump to a power steering device according to the output.