Mechatronic assembly controlled by a pulse-width modulation signal

Abstract

The invention relates to a mechatronic assembly (2) for driving a body, which is designed to be connected to a continuous electrical power source (4) and an electronic control unit (1) comprising a computer for running a power-assistance algorithm supplying a pulse-width modulation input signal having discrete states and a cyclic ratio encoding the steering and torque / speed information (6).

Description

technical field [0001] The invention relates to the field of electromechanical assemblies controlled with pulse width modulation, preferably for but not limited to automotive applications, such as eg phase shifting of camshafts. Background technique [0002] The prior art is known from French patent application FR14 / 61241, which describes an electromechanical unit for driving a member intended to be connected to a DC power supply on the one hand and to an ECU control unit on the other hand, the ECU control unit Comprising a computer for calculating servo algorithms for transmitting steering and torque information, the electromechanical unit includes: an actuator formed by a multi-phase brushless electric motor of N phases (where N>1); a binary sensor for detecting the position of the rotor of the motor; an electronic circuit comprising a power bridge for supplying N-phase of the motor. This prior art unit also includes an onboard electronic drive circuit without microcon...

AI Technical Summary

Problems solved by technology

[0010] In addition, the direction and speed information of the electromechanical components back to the controller enabling the application to be controlled is transmitted via different channels, which may lead to misinterpretation by the controller due to the lack of synchronization between the two signals, a risk associated with The rotational speed of the BLDC motor and its electronic power bridge control module develops proportionally

[0011] This second issue may be related to, but also independent of, the issue of the maximum speed limit

[0012] A third problem concerns extreme values ​​of the duty cycle of the pulse width modulated control signal (values ​​close to 0 or 100%), which cannot be generated by existing controllers

Therefore, these duty cycle ranges cannot be used to encode direction and torque / speed information

[0014] This results in a loss of a fraction (typically 8%) of the electrical power that can be delivered to the BLDC motor, which is a mirror image of the PWM control signal

[0015] This third issue may be related to, but also independent of, the issue of maximum speed limits

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