Calibration method for vehicle-mounted instrument pointer

Abstract

The invention relates to a calibration method for a vehicle-mounted instrument pointer. The method comprises the following steps: S1, starting a stepping motor, and enabling the pointer to indicate a zero graduation line; S2, acquiring an included angle between the pointer and the zero scale, taking the included angle as an initial error angle, and judging whether the initial error angle is within a first preset range or not; S3, when the initial error angle is not within the first preset range, adjusting the stepping motor to rotate according to the initial error angle, and executing step S2 again; and S4, when the initial error angle is within the first preset range, using the total motion angle of the motor as a calibration angle, and adjusting the calibration angle step by step until the mechanical zero-hour rebound angle is stabilized within the range of 1 DEG. According to the calibration method, the indication precision of the pointer can be calibrated, so that the motor is in the working temperature range, the indication error is stably controlled within 1 DEG C, the problem of inaccurate indication of the pointer caused by temperature change is solved, the indication stability of the instrument pointer is improved, and the driving safety is improved.

Description

technical field [0001] The invention belongs to the technical field of automotive electronics, in particular to a method for calibrating a pointer of a vehicle instrument. Background technique [0002] Automobile instrumentation is of great significance to the driver's driving safety. Once the instrument is damaged or the pointer is inaccurate, it will mislead the driver's driving judgment, easily cause the driver's dangerous driving, and even affect the lives of the drivers and passengers. Safety. Therefore, before the automotive instrument leaves the factory, it usually needs to detect and calibrate its indication accuracy, so that each scale indication is within the operating range. However, most of the existing automobile instruments realize the numerical indication through the rotation of the pointer on the dial driven by the stepping motor, and the working stability of the stepping motor is very easily affected by the ambient temperature. When the ambient temperature ...

AI Technical Summary

Problems solved by technology

However, most of the existing automobile instruments realize the numerical indication through the rotation of the pointer on the dial by the stepping motor, and the working stability of the stepping motor is very easily affected by the ambient temperature. When changing, when the stepper motor drives the pointer to change, the indication on each scale will be inaccurate due to the difference in the rebound angle, and the resulting error can reach up to 3° or more

Generally, car manufacturers require that the indication error be within 2°, and even more stringent car manufacturers require it to be within 1°, while the error reaches more than 3°, and the superposition error reaches more than 4°, which is obviously not allowed and accepted.

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