A stepper motor controller

Abstract

The invention discloses a stepping motor controller (20) which comprises a voltage stabilizer (23), a voltage stabilizer (24), a fixed-frequency pulse generator (25), an AND gate (26), a voltage comparator (27) and a voltage comparator (28), wherein the voltage stabilizer (23) and the voltage stabilizer (24) are used for modulating an input voltage signal ux (19) and supplying power to a controller, a driver and a stepping motor; the fixed-frequency pulse generator (25) is used for generating a fixed-frequency square-wave pulse signal CP0; the AND gate (26) accesses the CP0 and the input voltage signal ux (19) and is used for outputting a pulse signal CP; the voltage comparator (27) and the voltage comparator (28) are used for identifying the voltage magnitude of the input voltage signal ux (19); an output end is connected with the driver (21); when a high-voltage direct current voltage signal UH is inputted, the stepping motor rotates forward and the lift range of a piston is increased, and therefore the compression ratio of an engine can be increased; when a low-voltage direct current voltage signal UL is inputted, the stepping motor rotates reversely and the lift range of the piston is reduced, and therefore the compression ratio of the engine can be reduced; when a 0V voltage signal is inputted, the stepping motor does not work and the compression ratio of the engine is unchanged.

Description

technical field [0001] The invention relates to a stepping motor controller, in particular to a stepping motor controller used for variable lift compression ratio pistons. Background technique [0002] The variable compression ratio engine is to change the compression ratio of the engine in real time through control means, so that the engine adopts a high compression ratio to improve the thermal efficiency and fuel economy of the engine under low and medium load conditions; The high compression ratio prevents knocking. One of the ways is to change the compression ratio of the engine by adjusting the lift of the piston. The variable lift compression ratio piston changes the lift through the stepping motor. When the stepping motor rotates forward, the piston lift increases and the engine compression ratio increases. When the stepping motor reverses, the piston lift decreases and the engine The compression ratio decreases, and when the stepper motor is not working, the engine...

AI Technical Summary

Problems solved by technology

The control of the stepping motor generally needs three lines of power line, signal line and ground line, and the piston is inside the engine, which makes high-speed reciprocating linear motion during the working process. The stepping motor driving the piston is inside the piston and moves together with the piston. If the ordinary line connection method is used, the lead wire needs at least three lines, one end is fixed and the other end moves, the reliability is poor, and how to arrange it is a big problem

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