KR940006908Y1 - Speed meter controller of vehicle - Google Patents

Abstract

No content.

Description

Speed meter controller of car

1 is a detailed circuit diagram of a speed meta controller of a vehicle according to the present invention.

2 is an output waveform diagram of each stage of the frequency multiplication circuit according to the present invention.

* Explanation of symbols for main parts of the drawings

A: Speed sensor part B: Waveform shaping circuit

C: Frequency check circuit D: Cross coil driver circuit

E: constant voltage circuit bar: offset adjustment circuit

R1 to R2: resistors C1 to C7: capacitors

D1, D2: Diode ZDl: Control Diode

VR1, VR2: Variable resistor EX-OR1, EX-OR2: Exclusive ore gate

OP: Operational Amplifiers COMP: Comparators

ICI: Frequency / voltage conversion integrated circuit A: Integrating circuit

B: comparison circuit TRl: transistor

The present invention relates to a speed meter controller of a vehicle, and more particularly to a speed meter controller of a vehicle to prevent the shaking of the speed meter when the vehicle is running at low speed.

In general, the speed meter of a car uses the speed sensor to detect the speed by using 4 pulses / revolution, and at low speeds, the pulse input by 4 pulses / revolution is long, so this pulse input is converted into voltage. In this case, voltage ripple occurs and vibration of the guideline is generated.

Therefore, in order to prevent the shaking of the guideline at low speed, conventionally, a method of increasing the number of pulses using a speed sensor of 16 pulses / revolution or raising the guideline of the speed meter above a predetermined speed position is indicated. In the former case, when using the 16-pulse / rotational speed sensor, there is a lot of difficulty in the production, the latter had a problem that can not display the low-speed operation.

The purpose of the present invention is to prevent the shaking of the guideline by the voltage ripple caused by the pulse difference by frequency multiplying the pulse detected by the speed sensor of 4 pulses / rotation. The present invention includes a speed sensor unit for sensing a speed, a waveform shaping circuit for shaping a pulse input to the speed sensing sensor, a frequency multiplication circuit for multiplying a waveform shaped by the waveform shaping circuit, and the frequency multiplication circuit. Cross-coil driver circuit that converts the frequency multiplied by the furnace to voltage to drive the coil of the guideline, and offset to adjust the voltage of the drive signal output from the long-term cross-coil driver circuit to correct errors caused by incorrect insertion when the guideline is inserted. It is characterized by consisting of an adjustment circuit.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a detailed circuit diagram of a speed meter controller of a vehicle according to the present invention. The diode D1 performs waveform shaping after removing a noise by filtering a pulse signal detected and detected by a 4-pulse / rotation speed sensor unit. And integrate the waveform shaping circuit (b) consisting of the resistors (R1 to R4), the capacitor (C1), the transistor (TR1), and the exclusive oragate (ER-OR1), and the pulse frequency shaped by the waveform shaping circuit (b). And an integrated circuit (A) consisting of an operation amplifier (OP1), a resistor (R5 to R8), and a capacitor (C2), comparing the integrated waveform and multiplying it by two times, and the waveform and the reference voltage integrated from the integrated circuit (A). Is a comparison circuit (B) consisting of resistors R8 and Fl0 comparing each other, a comparator (COMP1), a frequency multiplication circuit (C) consisting of a beta oragate (EX-OR2), and the frequency multiplication circuit (C The multiplier pulse input from) is charged on the rising edge and discharged on the falling edge to change the voltage. Frequency / voltage conversion integrated circuit (IC1), resistors (R13 to R17), and capacitors (C3) and (C4) which output the data of the sine function and the cosine function, and drive the sine coil (Sin) and the cosine coil (Cos). , A cross coil driver circuit (D) consisting of a variable resistor (VRl), a sine coil (Sin), and a cosine coil (Cos), a diode (D2), and a resistor (R20) for outputting a voltage output from a battery at a constant voltage when the vehicle is started. ). A resistor (R18) that reduces the error caused by misinsertion by inserting instructions by adjusting the constant voltage circuit (e) consisting of the zener diode (ZD1) and the capacitors (C5 to C7) and the comparative voltage output from the crosscoil driver circuit (d). (R19) and the offset adjusting circuit (bar) composed of the variable resistor VR2.

2 is an output waveform diagram of each stage of the frequency multiplication circuit according to the present invention.

Referring to the effect of the present invention made as described above are as follows.

When the vehicle is first released, the constant voltage circuit (e) supplies the driving voltage to each circuit.

Subsequently, a 4-pulse / rotation speed detection signal different from the traveling speed detected by the 4-pulse / rotation speed sensor unit is supplied to the diode (1) of the waveform shaping circuit (B) and the resistor (R2) (R3) and the capacitor (C1). When the waveform is shaped through a filter circuit composed of), and the waveform-formed signal is found through the transistor TRl and input to the exclusive O-gate EX-OR1, the output terminal of the exclusive O-gate EX1-OR1 is provided. In Fig. 2, a square wave is output and input to a frequency multiplication circuit (C) as shown in Fig. 2 (1).

Therefore, in the frequency multiplication circuit (C), a square wave as shown in (1) of FIG. 2 input from the waveform shaping circuit (B) is input to the inverting terminal of the operational amplifier OP1 of the integrating circuit A. do.

Accordingly, in the integrating circuit A, the input waveform is integrated as shown in (2) of FIG. 2, and when the integrated waveform is input to the inverting terminal of the comparator COMP1, which is the comparing circuit B, the comparator In COMP1, a square wave as shown in (4) of Booty 2 is output as an output terminal compared with the reference voltage input to the non-inverting terminal of the comparator C0MP1 as shown in (2) of FIG. When input to the beta oragate EX-OR2, the output terminal of the exclusive oragate EX-OR2 outputs a pulse that is twice the input waveform as shown in (5) of FIG. It is applied to the frequency / voltage conversion integrated circuit (IC) of (d).

Therefore, the frequency / voltage conversion integrated circuit IC1 converts a pulse signal multiplied by two into a voltage to control the sine and cosine function generators built therein to control the sine and cosine coils of the instructions. By outputting the driving signal to (Cos), the ripple phenomenon of the voltage conversion is eliminated, and it is possible to prevent the shaking of the instructions during low-speed driving, and the instructions inserted in the offset adjustment circuit (bar) are incorrectly inserted. When error occurs due to state, it is adjusted.

As described above, the present invention reduces the ripple phenomenon of suppression due to the input pulse by multiplying the pulse signal detected by the speed sensor as a frequency multiplication circuit, thereby preventing the shaking of the guide due to the ripple phenomenon. There is.

Claims (1)

In the speed meter controller of a vehicle, a constant voltage circuit (e) which maintains and outputs the power supplied from the battery at a constant level when the vehicle is started, and a speed sensor that detects the driving speed of the vehicle and outputs 4 pulses / revolution signal (A), a waveform shaping circuit (b) for shaping a waveform by removing noise of pulses input from the speed detecting sensor (a), and a frequency for multiplying the waveform shaped by the waveform shaping circuit (b) by two times. A multiplier circuit (C) and a crosscoil driver circuit (D) converting the frequency multiplied by the frequency multiplier circuit (C) into a voltage to drive control the coil of the instruction. And an offset adjustment circuit (bar) for adjusting a voltage of a drive signal output from the cross coil driver circuit (D) to correct an error caused by an incorrect insertion when a guideline is inserted.