Patent ID: 8408181

Claim:
A throttle control module for controlling a throttle, comprising: a brushless direct current motor for moving the throttle, the brushless direct current motor having a permanent magnet rotor, the permanent magnet rotor having a number of pole pairs; a gear train having a reduction coefficient and connecting the brushless direct current motor to the throttle; a throttle position sensor generating a throttle position signal indicative of the position of the throttle; a pulse-width modulation module connected to the throttle position sensor, generating a pulse-width modulation sequence according to the throttle position signal from the throttle position sensor and a desired throttle position signal; a decoder module connected to the throttle position sensor, performing decoding calculation on the throttle position signal from the throttle position sensor to generate commutation logic for the brushless direct current motor; and a motor controller connected to the pulse-width modulation module and the decoder module, to control commutation of the brushless direct current motor according to the pulse-width modulation sequence and the commutation logic; wherein the decoder module comprises: an analog-digital converter for converting the throttle position signal from the throttle position sensor into a digital throttle position signal and calibrating the digital throttle position signal; and a decoding calculation unit for performing decoding calculation based on the calibrated digital throttle position signal, the conversion precision of the analog-digital converter, the number of pole pairs of the rotor and the reduction coefficient of the gear train to get an electrical angle corresponding to the current position of the throttle, and generating the commutation logic according to the electrical angle; and wherein the decoder module calculates the electrical angle according to the equation: G = Rem ⁡ [ ( X 2 n * RANG * m * P ) / 360 ] , wherein, Rem [ ] represents a function to take the reminder, X represents the calibrated digital throttle position signal, n represents the precision bits of the analog-digital converter, RANG represents the maximum angle that the throttle can rotate, m represents the reduction coefficient of the gear train, and P represents the number of pole pairs of the rotor.