A method and device for automatically detecting the gear position of a manual transmission motor vehicle

Abstract

The invention provides a manual-transmission motor vehicle gear automatic detection method and device. The method comprises the following steps: carrying out calibration on a maximum distribution range of relative spatial attitude of each motor vehicle gear, and carrying out gear detection: to begin with, collecting spatial attitude of a motor vehicle, and then, collecting spatial attitude of a joy stick; carrying out conditional sliding window filtering processing, and then, carrying out subtraction to obtain initial space attitude data of the gear at the moment; comparing the initial space attitude data with the maximum distribution range of the relative spatial attitude of the joy stick in each gear calibrated in the step 1) to obtain a detection value of a gear state; carrying out evaluation to obtain an evaluation value of the gear state; and displaying the gear state evaluation value and meanwhile, sending the gear state evaluation value to an upper computer to finish one gear state detection. The method and device carry out rejecting and filtering processing on possibly-occurred interference and noise through an algorithm, thereby improving gear detection result reliability;and during detection, free stroke of the joy stick is taken into consideration, and the gear detection value is subjected to secondary evaluation, thereby improving gear detection accuracy, and enabling gear detection not to be influenced by old and new wear of the motor vehicle.

Description

technical field [0001] The invention relates to the technical field of automatic detection of motor vehicle status, in particular to an automatic detection method and device for the gear position of a manual transmission motor vehicle used for driving skill training and assessment of motor vehicle drivers. Background technique [0002] The gear position is the key executive mechanism of motor vehicle speed control. Whether the gear position can be reasonably controlled according to the actual road traffic conditions, and then the vehicle speed can be reasonably controlled is an important part of motor vehicle driving skills. Therefore, in the standardized training and automatic assessment of motor vehicle driving skills, in order to accurately and scientifically evaluate the driver's driving skills, automatic detection of motor vehicle gear positions has become an important premise and basis. [0003] Traditionally, the detection method for motor vehicle gears is to make a s...

AI Technical Summary

Problems solved by technology

[0003] Traditionally, the detection method for motor vehicle gears is to make a set of thick and heavy mechanical structural parts and put them on the gear levers. The structural parts are equipped with Hall sensors or photoelectric sensors corresponding to each gear position. The magnet installed on the joystick or the shielding effect of the joystick detects the gear state; this kind of structure is complicated to make, the installation workload is large, and the structure and sensor are easy to fall off and damage after installation; and it is used in a motor vehicle joystick. After a period of time, there is a large gap between the states of each gear position, and the joystick has a certain free travel, which will shake during the driving process of the motor vehicle, resulting in misjudgment of the gear position detection

With the improvement of motor vehicle processing technology, the precision of the gear control mechanism is getting higher and higher, and the space left for the installation of the gear detection mechanism is getting smaller and smaller, making this method more and more difficult to meet the requirements of gear detection.

[0004] In order to overcome the detection misjudgment caused by the shaking of the joystick in the above method, another gear position detection method is to disassemble the transmission case, install a permanent magnet on the shift fork shaft of the gear shifting mechanism, and The position of the box corresponding to the gear shift fork shaft is inlaid with a Hall sensor to achieve reliable detection of the gear status; however, this method requires more installation work, and due to the disassembly and modification of the gearbox, it is easy to appear Motor vehicle power transmission failure may cause traffic accidents due to motor vehicle failure when the motor vehicle is driving, which has buried hidden dangers for driving safety

[0005] There is also a method of using the transmission ratio of the motor vehicle to detect the gear position state, that is, by detecting the engine speed of the motor vehicle and the driving speed of the motor vehicle, using software to calculate the transmission ratio of the motor vehicle, and indirectly detecting the transmission ratio according to the numerical value of the transmission ratio. Motor vehicle gear status; this method is susceptible to changes in the transmission ratio due to the influence of the clutch being released or in a semi-linkage state, causing errors in gear position detection when the clutch is stepped on, so there are great limitations in use

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