Method for discriminating neutral gear on basis of electronic neutral gear sensor

Abstract

The invention provides a method for discriminating a neutral gear on the basis of an electromagnetic neutral gear sensor. The method includes storing a plurality of self-learning neutral gear duty cycle values in a memory, reading the self-learning neutral gear duty cycle values after a vehicle is powered on, solving a median value or an average value of the self-learning neutral gear duty cycle values, then using a complementary value of the median value or the average value as a base point of a neutral gear duty cycle discriminating range, judging whether duty cycle values of currently outputted first PWM (pulse width modulation) waves are in a range with the base point as the center or not, and determining that the vehicle is in the neutral gear if the duty cycle values of the first PWM waves are within the range; performing self-learning on the neutral gear duty cycle values, and storing duty cycle values of second PWM waves which are currently outputted by the electromagnetic neutral gear sensor so that the duty cycle values of the second PWM waves can be used when the vehicle is powered on for the next time. The method has the advantages that the base point of the range for discriminating the neutral gear duty cycle values can be acquired by a software algorithm, so that self-learning, self-correcting and self-compensating can be performed on a neutral gear duty cycle, the neutral gear discriminating accuracy and instantaneity can be improved, and the adaptability to different types of vehicles can be improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a neutral-gear discrimination method based on an electromagnetic neutral-gear sensor. Background technique [0002] At present, the intelligent start-stop system of automobiles can assist the driver to manage the start-stop action of the engine, and reduce the idling conditions when waiting for traffic lights and traffic jams, so as to achieve the purpose of reducing fuel consumption and reducing emissions. However, in the process of realizing the intelligent start-stop system, the neutral signal is a very important shutdown enabling condition, and how to accurately judge the neutral signal is the key to whether the intelligent start-stop can be realized. [0003] The intelligent start-stop system includes two parts: stop and start. Engine shutdown includes shutdown enable conditions and shutdown trigger conditions. Engine restart includes restart enable conditions and restar...

AI Technical Summary

Problems solved by technology

However, in actual working conditions, due to the error of the sensor itself and the installation error, as well as the error caused by the aging of the electromagnetic neutral sensor or the driver's driving habits during use, the base point of the neutral duty cycle judgment range is not fixed. , but a varying value

Therefore, although the electromagnetic neutral sensor has a fault self-diagnosis function and higher reliability than the general switch neutral sensor, it also has the problem of inaccurate neutral judgment caused by various errors.

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