JPS612036A - Side slip tester - Google Patents

Abstract

PURPOSE:To improve measuring accuracy by sampling a detected output of a side slip detector through a signal converter, holding the maximum value of the sampled output by a holding circuit and discriminating a side slip direction by a decision circuit. CONSTITUTION:A side slip value of a wheel at the time of its straight advancement is detected by the side slip detector 10 and its detected output is amplified by an amplifier 12, sampled by the signal converter 14, adjusted at its level by an attenuator 16, and then inputted to the holding circuit 18. The maximum value out of the converted outputs of the signal converter 14 is stored in the holding circuit 18 and the side slip value of the wheel is displayed on a display device 22. On the other hand, the detected output of the detector 10 is inputted to the decision circuit 24 to discriminate and display the side slip direction of the wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a side slip tester that detects the amount of side slip of wheels when traveling straight.

[Background of the invention]

Conventional side slip testers are configured to display the mechanical displacement of a detector that detects the amount of wheel skidding using a celsin motor, and therefore have the following problems.

In other words, because the cell thin motor is used, the pointer on the display moves quickly, making it impossible to read accurately. Also, the pointer does not stop at a position corresponding to the amount of sideslip due to inertia, making accurate display impossible. was there.

[Purpose of the invention]

An object of the present invention is to provide a side slip tester with improved measurement accuracy.

[Summary of the invention]

The present invention includes: a side slip amount detector that detects the amount of side slip of an automobile wheel; a signal converter that captures the detection output of the side slip amount detector and samples the detection output at a constant cycle;
The vehicle is characterized by comprising a holding circuit that holds the maximum value of the output of the signal converter, and a determination circuit that determines the skidding direction of the wheel based on the polarity of the detection output of the skidding scene detector. .

[Embodiments of the invention]

Embodiments of the present invention will be described based on the drawings. FIG. 1 shows the basic configuration of a side slip tester according to the present invention.

In the figure, a side slip amount detector 10 detects the amount of wheel side slip when the vehicle is traveling straight, and the detected output is amplified to a predetermined level by an amplifier 12. Further, the output signal of the amplifier 12 is sampled by the signal converter 14, subjected to Schiepel adjustment by the attenuator 16, and inputted to the holding circuit 1B. The maximum value of the converted outputs of the signal converter 14 is stored and held by the holding circuit 18, and the amount of skid of the wheels is displayed on the display device 22.

On the other hand, the detection output of the sideslip amount detector 10 is input to the determination circuit 24, and the determination circuit 24 determines and displays the direction of wheelslip.

Note that 20 is a reset switch for resetting the memory contents of the holding circuit 18.

Next, FIG. 2 shows the configuration of an embodiment of a side slip tester according to the present invention. In the figure, sideslip amount detector 11
0 is a plate (provided on the test stand) configured to move according to the amount of skidding of the wheels when driving straight.
ID 1' and a displacement meter (for example, an IDS displacement meter) 102 that converts the amount of displacement of the plate 101 into an electric signal. The detection output of this side slip amount detector 110 is amplified to a predetermined level υ by an amplifier 112 consisting of an operational amplifier OP1 and resistors R1, R2, and R5 (see Fig. 3).
A)).

Further, the output signal of the amplifier 112 is input to a signal converter 114 and a determination circuit 124. The signal converter 114 includes an operational amplifier op2, resistors R4, R5, R6, R7, and PET1.
15, coupling capacitor C1 and pulse oscillator 1
The output signal of the amplifier 112 is sampled by the pulse output of the pulse oscillator 140 (Fig. 3 (B)), and this sampling output (Fig. 5 (C)
)) is coupling capacitor C1, variable resistor VR1
and the holding circuit 1 through an attenuator 116 such as a resistor R8.
It is input to 1B.

Here, the attenuator 116 has a proportional relationship between the amount of movement of the plate 101 constituting the side slip bi amount detector 10 and the output voltage of the holding circuit 118 (for example, when the amount of movement is 1, the output voltage is 1v).
) is used to adjust the input voltage of the holding circuit 18 so that the holding circuit 118 has a diode D1,
Resistors R9, R10, operational amplifier op5, capacitor C2
The output voltage is applied to the capacitor C2 via the diode D1, and the capacitor C2 is charged and held. The sampling voltage held by the capacitor C2 is amplified by an operational amplifier OP5 and an amplifier including resistors R9 and R10 (FIG. 5(D)), and is output to the display device 122.

On the display device 122, the amount of side slip υ of the wheel is displayed, for example, digitally.

On the other hand, the output signal of the amplifier 112 is input to the determination circuit 124, which includes an operational amplifier OP4, resistors R11, R12, a diode D2, and a ramp 'L1. Here, operational amplifier op4. Since the amplifier composed of resistors R11 and R12 is an inverting amplifier, the output of the amplifier 112, that is, the output signal of the skid amount detector 110 has a negative polarity, in other words, only when the wheel skids outward, the lamp is activated. L1 lights up.

As explained above, according to this embodiment, the measurement accuracy of the amount of skidding of wheels can be improved.

In this embodiment, the amount of side slip υ of the wheels is detected by analog processing, but this may be performed by digital calculation processing using a microcomputer or a printer.

〔Effect of the invention〕

According to the present invention, it is possible to improve the accuracy of measuring the amount of wheel skidding.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing the basic configuration of a side slip tester according to the present invention, FIG. 2 is a circuit diagram showing the configuration of an embodiment of the side slip tester according to the present invention, and FIG. FIG. 5 is a signal waveform diagram showing the operating state of each part in FIG. 2. 10...Slide amount detector, 12...Amplifier, 14...Signal converter, 1
6...attenuator, 1st...holding circuit, 22...
...display circuit, 24...judgment circuit.

Claims (1)

[Claims] A sideslip amount detector that detects the amount of sideslip of an automobile wheel;
a signal converter that takes in the detection output of the sideslip amount detector and samples the detection output at a constant cycle; a holding circuit that holds the maximum value of the signal converter output; and a polarity of the detection output of the sideslip amount detector. 1. A side slip tester comprising: a determination circuit that determines the skidding direction of a wheel based on the .