System and method for car parking in P gear

Abstract

The invention discloses an automobile P-gear parking prompting system and method. The automobile P-gear parking prompting system includes a parking gear position sensor, a parking pawl angle sensor, atransmission control unit, an electronic handbrake, a combination instrument, an electronic shift system and a brake system, wherein the parking gear position sensor and the parking pawl angle sensorare connected to the transmission control unit; the transmission control unit, the electronic handbrake, the combination instrument, the electronic shift system, and the brake system are connected toa CAN bus for communication.; when the user is in P gear, and when the rotation angle of the parking pawl is less than or equal to the set angle threshold, the automobile P-gear parking prompting system further judges whether the user pulls or does not pull the handbrake; if the handbrake is not pulled, the user is reminded that the P gear parking is abnormal in the combination instrument; and when the rotation angle is greater than the set angle threshold, the parking pawl is considered to be successfully stuck in the gear groove of the parking car, and the P gear parking is normal in the instrument cluster. The automobile P-gear parking prompting system can effectively prompt the risk of the P gear mounting state and reduce the complaint of the user.

Description

technical field [0001] The invention belongs to the field of P-block parking inside an automobile automatic transmission, and in particular relates to a P-block parking reminder system and method for an automobile. Background technique [0002] With the gradual deepening of the process of vehicle electrification and intelligence, the current automatic transmission vehicles in related technologies are gradually developing from mechanical shifting to intelligent electronic shifting. The P-block parking structure inside the automatic transmission usually still adopts the single-tooth meshing of the parking gear and the parking pawl to realize the auxiliary parking of the automatic transmission vehicle. Due to this structural feature, when the user performs the parking operation in P gear, there is randomness in the parking pawl clipping into the tooth slot of the parking gear, that is, sometimes the parking pawl can be normally clipped into the parking gear tooth slot. , but s...

AI Technical Summary

Problems solved by technology

Due to this structural feature, when the user performs the P gear parking operation, there is randomness in the parking pawl snapping into the tooth slot of the parking gear, that is, sometimes the parking pawl can be normally snapped into the parking gear slot , but sometimes the parking pawl will be on the tooth top of the parking gear; however, once the parking pawl is on the tooth top of the parking gear, when the user does not pull the handbrake and parks in P gear, the vehicle will The car will slide, and after the car slides for a certain distance, the parking pawl will be stuck in the tooth groove of the parking gear under the action of external force, and a large contact stress will be formed between the parking gear and the parking pawl, resulting in excessive clamping ; Finally, when the user starts the vehicle next time, the shifting force of the P gear will be too large to be pulled out, and the engine will produce a "humming sound", or when the P gear is pulled out, due to the contact between the parking pawl and the parking gear. The stress is released instantly, resulting in abnormal noise when shifting gears, causing users to complain

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