Calibrating apparatus for radar tachometers for motor vehicles

Abstract

The invention discloses a calibrating apparatus for radar tachometers for motor vehicles. The calibrating apparatus comprises a framework and a motor. The motor is fixedly arranged on the framework, a main drum and an auxiliary drum are further arranged on the framework, the main drum is in transmission connection with the motor, and the auxiliary drum is in transmission connection with the main drum by a synchronous belt; a plurality of metal strips which are uniformly distributed are fixedly arranged on the peripheral surface of the synchronous belt along operation directions and can horizontally move on up-down planes of the synchronous belt; the speeds of the motor can be steplessly regulated by the aid of frequency conversion technologies, running speeds of the test vehicles can be simulated by horizontal movement linear speeds of the metal strips, the horizontal movement linear speeds of the metal strips can be displayed on a display by a main control panel and can be compared to speeds measured by the radar tachometers aligned with the metal strips, and speed errors between the speeds and the horizontal movement linear speeds can be computed. The calibrating apparatus has the technical advantages that speed values, which range from 20 km / h to 180 km / h, of various calibration points can be precisely tested by the calibrating apparatus, the radar tachometers on optional road sections can be tested, the speed calibration points can be calibrated in high-speed periods, the calibrating apparatus is good in repeatability, potential safety hazards can be prevented when the test vehicles run, and the calibrating apparatus can be used for calibrating speed measurement in fields instead of the test vehicles.

Description

technical field [0001] The invention relates to a testing device for a speedometer, in particular to a calibrator for a motor vehicle radar speedometer. Background technique [0002] According to the provisions of JJG527-2015 "Fixed Motor Vehicle Radar Speedometer" and JJG528-2015 "Mobile Motor Vehicle Radar Speedometer" in the national metrology verification regulations: the on-site speed measurement range of the radar speedometer is 20-180km / h, and the on-site speed error The verification is to drive the test vehicle equipped with a standard speedometer at a constant speed (20-180km / h), the standard speedometer measures and displays the speed value of the test vehicle when it passes through the detection area, and the radar speedometer controls the speed of the test vehicle. Take speed measurements. The speed point of the first verification (7 standard speed values, of which 20km / h, 60km / h, 120km / h, 180km / h must be verified) is about 50% and 100% of the speed limit value....

AI Technical Summary

Problems solved by technology

There are following disadvantages in the prior art of using test vehicles for verification work: the driver of the test vehicle cannot accurately control the standard speed values ​​of each verification point when the vehicle is running; the speed of the test vehicle must reach 180km / h, which is very dangerous; It is impossible to test the same speed at 7 measurement points at the same speed five times, so the repeatability error cannot be verified; and the current speed of the test vehicle itself is the speed measured by GPS as the reference speed, but the test vehicle in the tunnel cannot receive satellites signal, it is impossible to use the test vehicle as a standard to calibrate or verify the radar speedometer

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