JPH0248855B2 - - Google Patents

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 have been configured to display the mechanical displacement of a detector that detects the amount of side slip of a wheel using a celsin motor, which has caused 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. It was hot.

[Object 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 provides a sideslip amount detector that detects the amount of sideslip of an automobile wheel, a signal converter that captures the detection output of the sideslip amount detector and samples the detection output at a constant cycle, and The present invention is characterized in that it includes a holding circuit that holds the maximum value, and a determination circuit that determines the direction of skidding of the wheels based on the polarity of the detection output of the skidding amount detector.

[Embodiments of the invention]

Embodiments of the present invention will be described based on the drawings. The basic configuration of a side slip tester according to the present invention is shown in FIG. In the same figure, sideslip amount detector 1
0 detects the amount of side slip of the wheels when traveling straight, and the detected output is amplified to a predetermined level by the amplifier 12. Further, the output signal of the amplifier 12 is sampled by a signal converter 14, level-adjusted by an attenuator 16, and inputted to a holding circuit 18. Then, the holding circuit 18 causes the signal converter 14 to
The maximum value of the converted outputs is stored and held, and the display device 22 displays the amount of skid of the wheels.

On the other hand, the detection output of the sideslip amount detector 10 is input to a 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 storage 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, a sideslip amount detector 110 uses a plate 101 (provided on the test stand) configured to move according to the amount of sideslip of the wheels when traveling straight, and converts the amount of displacement of the plate 101 into an electrical signal. It is composed of a displacement meter (for example, an IDS displacement meter) 102 that converts. The detection output of this sideslip amount detector 110 is an operational amplifier.
Amplifier 1 consisting of OP1 and resistors R1, R2, and R3
12, the signal is amplified to a predetermined level. (3rd
Figure A).

Furthermore, the output signal of the amplifier 112 is sent to the signal converter 11.
4 and the determination circuit 124. The signal converter 114 includes an operational amplifier OP2, resistors R4, R5, and R.
6, R7, FET 115, coupling capacitor C1, and pulse oscillator 140, and the output signal of amplifier 112 is connected to pulse oscillator 14.
0 pulse output (FIG. 3B), and this sampling output (FIG. 3C) is input to the holding circuit 118 via an attenuator 116 consisting of a coupling capacitor C1, a variable resistor VR1, and a resistor R8. Ru.

Here, the attenuator 116 is configured to measure the movement amount of the plate 101 constituting the sideslip amount detector 110 and the holding circuit 11.
The holding circuit 1 is set so that the output voltage of 8 is in a proportional relationship (for example, when the travel distance is 1 mm, the output voltage is 1 V).
It is used to adjust the input voltage of 8.

Now, the holding circuit 118 includes a diode D1, resistors R9 and R10, an operational amplifier OP3, and a capacitor C.
The sampling output voltage is applied to a capacitor C2 via a diode D1, and is charged and held in the capacitor C2. The sampling voltage held by capacitor C2 is then applied to operational amplifier OP3, resistor R9,
The signal is amplified by the amplifier R10 (FIG. 3D) and output to the display device 122. Display device 1
At 22, the amount of wheel skidding is displayed digitally, for example.

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

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

Although the present embodiment is configured to detect the amount of wheel skidding using analog processing, this may also be performed using digital arithmetic processing using a microcomputer, printer, or the like.

〔Effect of the invention〕

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

[Brief explanation of 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. 3 is a signal waveform diagram showing the operating state of each part. 10...Sideslip amount detector, 12...Amplifier, 14...
Signal converter, 16... Attenuator, 18... Holding circuit, 2
2... Display circuit, 24... Judgment circuit.

Claims (1)

[Claims] 1. 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 period, and a maximum value of the output of the signal converter. A side slip tester comprising: a holding circuit for holding a side slip; and a determining circuit for determining a side slip direction of a wheel based on the polarity of a detection output of the side slip amount detector.