SU1727083A1 - Device for measuring vehicle motion speed - Google Patents

Abstract

The invention relates to instrument engineering and can be used for contactless measurement of the speed of a vehicle. The aim of the invention is to increase speed and simplify. This is achieved by entering into the device circuit of the switch 9 the outputs of the signal receivers and the sensor 10 of the reverser position, which, depending on the direction of movement of the vehicle, allow the outputs of the first and second signal receivers to switch between each other. 2 Il.

Description

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The invention relates to the field of instrumentation and can be used for contactless measurement of the speed of a vehicle.

The aim of the invention is to increase the speed and simplify the device.

FIG. 1 shows a block diagram of the device; in fig. 2 is a schematic diagram of the switch of the outputs of the signal receivers and the sensor of the position of the reverser.

The device contains two receivers 1 and 2 random correlated signals (for example, photodetectors with their amplifiers) rigidly located on the vehicle along its movement, the correlator 3 consisting of an adjustable delay unit 4, an overlap unit 5 and an integrator b, extreme regulator 7, indicator 8, switch 9 of the outputs of the signal receivers and sensor 10 of the reverser position.

Reversal position sensor 10, switch 9 outputs of signal receivers 9, adjustable delay unit 4, multiplication unit 5, integrator 6, extreme controller 7, the output of which is connected to the control input of the adjustable delay unit, whose information output is connected to the indicator , the outputs of the first and second signal receivers are connected respectively to the first and second inputs of the output switches of the signal receivers, the first output of which is connected to the first input of the unit multiplied and

The device works as follows.

When the vehicle is moving in the direction indicated by a solid arrow and corresponding to one of the two positions of the reverser, an electrical signal f (t) appears at the output of receiver 2, and an electrical signal f (t - tT) appears at the output of receiver 1. If the vehicle moves in the opposite direction indicated by the dotted arrow corresponding to the other position of the reverser, then the output of receiver 1 will be the signal f (t), and the output of receiver 2 is the signal f (t - tT), where tr is the value the time delay of the transport signal

tT l / v,

where I is the base distance between receivers 1 and 2;

v is the linear speed of the vehicle.

According to the signal from the sensor 10 of the reverser position, the switch 9 connects the output of the forward signal in the direction of movement of the receiver to a block signal

4 adjustable delay, and the output of the rear signal in the direction of movement of the receiver of a random signal to the first input of block 5 multiplication. In the adjustable lag unit 4, the signal is delayed by an adjustable amount. From the output of block 4. the delayed signal is applied to the second input of block 5 multiplication.

The product of the signals from the output block

5 multiplication is fed to the input of integrator 6, at the output of which there will be a mutually correlation function of the signals R (T). With the aid of the extreme controller 7, such a ty is established. so that the maximum of the mutually correlation function R (T) exists at the output of the correlator. Information from the output of the adjustable lag unit, corresponding to the speed of the vehicle in a given direction, is supplied to the indicator 8,

Claims (1)

Invention Formula An apparatus for measuring vehicle speed, comprising two signal receivers located along the vehicle's travel line, an adjustable delay unit connected in series, a multiplication unit, an integrator and an extreme controller, the output of the extreme controller is connected to the control input of the adjustable delay unit, and an indicator , characterized in that, for the purpose of speeding up and simplifying, a vehicle reverser position sensor is inserted into it and will switch The first and second inputs of which are connected respectively to the outputs of the first and second signal receivers, the first output of the switch is connected to the first input, the multiplication unit, and the second output is connected to the input of the adjustable delay unit, the information output of which is connected to the indicator, and the control input of the switch connected to the output of the vehicle reverser position sensor. W t V- YSA1 SA2 2