Engine oil pressure gauge driven by stepper motor

Abstract

This invention discloses an oil pressure meter driven by a stepmotor including a supply converter connected with a micro-controller and track-to-track signal processor connected between a pressure sensor and the microcontroller to level-shift the voltage signal emitted by the pressure sensor to be amplified and output to the microcontroller, a primary voltage source connected between the signal processor and the supply converter providing transfer voltage for the level transfer, a motor driver connected with the output of the microcontroller to amplify the signal output by the microcontroller and output it to the stepmotor connected with the pointer of the pressure meter.

Description

technical field [0001] The invention relates to an automobile engine, in particular to an engine oil pressure gauge driven by a stepping motor for detecting engine oil pressure. Background technique [0002] At present, the output signal of the pressure sensor that detects the engine oil pressure gauge is a voltage signal of -5mV-50mV. Usually, the sampling signal of the microcontroller is a voltage signal of 0-5V, and only positive voltage / current signals are sampled. For the above-mentioned pressure sensor The output -5mV-50mV voltage signal cannot be directly sampled and quantified by the microcontroller. Therefore, the output signal of the pressure sensor needs to be processed and amplified so that the circuit output signal is a (0-5V) voltage that the microcontroller can sample. In view of the above situation, the traditional processing method provides a negative power supply for a chip that uses dual power supply or converts from positive power supply to negative power...

AI Technical Summary

Problems solved by technology

[0005] Using the above solution, the power converter electrically connected to the microcontroller can supply power to the circuit through a single power supply, which can convert the output voltage of the car battery into the standard working voltage output of the microcontroller, and output the voltage to the rail-to-rail signal processor When the voltage of the microcontroller is the same, the output voltage range of the rail-to-rail signal processor can be increased to improve the quantization resolution of the sampling signal and ensure the linearity of the sampling signal; at the same time, it can also prevent the microcontroller’s The I / O interface is burned; and there is no need to use limiter protection measures to solve the voltage mismatch problem, resulting in a simplified circuit structure and reduced production costs.

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