CN-121977069-A - Motor parking locking system of electric automobile and parking locking working method

CN121977069ACN 121977069 ACN121977069 ACN 121977069ACN-121977069-A

Abstract

The invention provides a motor parking locking system of an electric automobile and a parking locking working method, and belongs to the technical field of electric automobile transmission devices. The locking mechanism is characterized in that the right end of the V-shaped pawl is engaged with a groove on the ratchet wheel, the middle section of the V-shaped pawl is rotatably arranged, the left end of the V-shaped pawl is connected with the return tension spring, the stepping motor drives the push rod to push the right end of the pawl to engage the groove of the ratchet wheel, the return tension spring is in a stretching state, and the right end of the pawl is disengaged from the groove of the ratchet wheel under the action of the retraction force of the return tension spring and is abutted against the push rod when the push rod does not push the pawl, so that the locking mechanism can use the return tension spring to replace the two structural forms of the torsion spring sleeved on the power part in the prior art, and the problems of inconvenient installation and complex structure of the locking mechanism in the prior art are solved. And by combining the method design of the system, the problem that clamping stagnation possibly occurs when the pawl is clamped into the groove of the ratchet wheel in the prior art is solved.

Inventors

FU GUANGZE
MU JUNYI
YAN CHAOYANG
WANG HAORONG

Assignees

重庆鑫源动力制造有限公司

Dates

Publication Date: 20260505
Application Date: 20260309

Claims (10)

1. A motor parking lock system of an electric vehicle, comprising: The ratchet wheel is fixedly sleeved on the output shaft of the motor; The pawl is in a V shape, and the right end of the pawl is in clamping fit with a groove on the ratchet wheel; one end of the return tension spring is fixedly connected to the motor, and the other end of the return tension spring is connected with the left end of the pawl; the stepping motor is arranged on the motor, a push rod is arranged on an output shaft of the stepping motor, and the push rod rotates along with the rotation of the output shaft of the stepping motor; the inclination angle sensor is used for detecting the inclination angle of the electric automobile; Detecting the rotation angle and the rotation speed of an output shaft of the motor by a rotation-transformation combination; the control system receives signals of the inclination angle sensor and the rotation change combination and sends signals to the motor and the stepping motor; the power module receives the signal of the control system and converts direct current of the electric automobile battery into three-phase alternating current with corresponding frequency matched with the rotating speed of the motor; the push rod pushes the right end of the pawl to be clamped with the groove of the ratchet wheel, and the return tension spring is in a tension state; when the push rod does not push the pawl, the right end of the pawl is disengaged from the groove of the ratchet wheel and is abutted against the push rod under the action of the retraction force of the return tension spring.
2. The electric vehicle motor parking lock system of claim 1, wherein: the push rod is of a type of 'sigma', an 'O' -shaped part of the push rod of the type of 'sigma' is fixedly sleeved on an output shaft of the stepping motor, and a protruding part of the push rod of the type of 'sigma' is abutted against the pawl.
3. The electric motor car parking lock system of claim 2, wherein: The protruding part of the push rod in the sigma shape is propped against the right part of the pawl in the V shape.
4. The electric vehicle motor parking lock system of claim 1, wherein: The inner side of the right part of the V-shaped pawl is provided with a clamping hook, and the outer side of the V-shaped pawl is provided with a supporting bulge; The clamping hook is clamped with the groove of the ratchet wheel, and the abutting part abuts against the protruding part of the 'sigma' -shaped push rod.
5. The electric vehicle motor parking lock system of claim 1, wherein: When the stepping motor rotates clockwise, the push rod pushes the right end of the pawl to be clamped with the groove of the ratchet wheel; when the stepping motor rotates anticlockwise, the push rod does not push the pawl, and under the action of the retractive force of the return tension spring, the right end of the pawl is separated from the clamping with the groove of the ratchet wheel and is propped against the push rod.
6. The electric vehicle motor parking lock system of claim 1, wherein: the motor also comprises a spring seat and a pawl seat, wherein the spring seat and the pawl seat are fixedly arranged on the motor; one end of the return tension spring is fixedly connected to the spring seat, and the other end of the return tension spring is connected with the left end of the pawl; The middle section of the V-shaped pawl is hinged on the pawl seat.
7. The electric vehicle motor parking lock system of claim 1, wherein: When the right end of the pawl is clamped with the groove of the ratchet wheel, the included angle between the tangential line of the ratchet wheel and the right part of the pawl is 12 degrees.
8. The electric vehicle motor parking lock system of claim 1, wherein: The material of the ratchet wheel and the pawl is 20CrMo.
9. The electric vehicle motor parking lock system of claim 1, wherein: the material of the return tension spring is spring steel.
10. A parking lock operation method of a motor parking lock system of an electric vehicle based on any one of claims 1 to 9, characterized by comprising the steps of: S1, stopping the vehicle; S2, detecting the inclination angle alpha of the electric automobile by using the inclination angle sensor, and detecting the rotation angle beta of the ratchet wheel driven by the motor output shaft by using the rotation-transformation combination; s3, executing any one of the steps S31, S32 and S33; S31, when the rotation angle beta of the ratchet wheel is a limiting value, the control system controls the stepping motor to drive the push rod to push the right end of the pawl to be clamped with the groove of the ratchet wheel, and the return tension spring is in a tension state; S32, when the rotation angle beta of the ratchet wheel is not a limiting value and the inclination angle alpha=0° of the electric automobile, the control system controls the output shaft of the motor to rotate until the rotation angle beta of the ratchet wheel is the limiting value, the control system controls the stepping motor to drive the push rod to push the right end of the pawl to clamp the groove of the ratchet wheel, and the return tension spring is in a stretching state; S33, when the rotation angle beta of the ratchet wheel is not a limiting value and the inclination angle alpha of the electric automobile is not equal to 0 DEG, the electric automobile moves under the action of self gravity until the rotation angle beta of the ratchet wheel is the limiting value, the control system controls the stepping motor to drive the push rod to push the right end of the pawl to clamp the groove of the ratchet wheel, and the return tension spring is in a stretching state; s4, starting the vehicle; S5, the control system controls the stepping motor to drive the push rod to move in the opposite direction to the step S3, the push rod does not push the pawl, and under the action of the retraction force of the return tension spring, the right end of the pawl is disengaged from the groove of the ratchet wheel and is propped against the push rod; s6, the control system controls the motor to rotate to generate force for driving the electric vehicle to move forwards; And S7, running the electric automobile.

Description

Motor parking locking system of electric automobile and parking locking working method Technical Field The invention belongs to the technical field of electric automobile transmission devices, and particularly relates to a motor parking locking system of an electric automobile and a parking locking working method. Background The parking device is mainly used for locking a speed changer of an automobile, so that the automobile can be parked in situ. The electric control locking technology is a parking locking technology commonly adopted by electric automobiles, namely, the current direction is changed through an inverter, the counter-pole braking motor is in a locked state, the parking locking technology can continuously consume battery energy in the process of parking, and the motor continuously heats under the working condition, so that the risk of motor damage is increased, and the failure of the whole braking system is possibly caused. In order to solve the technical problem, the parking device of the electric automobile adopts a mechanical locking mechanism, for example, an automobile parking locking mechanism described in Chinese patent application publication No. CN203500449U, and realizes a locking function by matching a pawl with a ratchet wheel, and the pawl realizes locking and unlocking with a ratchet wheel groove under the action of a driving part and a return leaf spring. The utility model also discloses a cam mechanism and a parking device described in the Chinese patent with the publication number of CN212509395U, and the locking function is realized by the cooperation of a pawl and a ratchet wheel, but compared with the Chinese patent with the publication number of CN203500449U, the utility model further comprises a cam mechanism, and a corresponding power piece applies a driving force to the pawl by driving the cam mechanism. The reset structures of the mechanical locking structures described in the patent are torsion springs sleeved on the pawl rotating shafts, so that the pawl is inconvenient to install and complex in structure. Meanwhile, when the pawl is clamped in the groove of the ratchet wheel, the ratchet wheel is sleeved on the output shaft of the motor, and the specific stopping position of the ratchet wheel is uncertain, so that clamping stagnation can occur when the pawl is clamped in the groove of the ratchet wheel. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a motor parking locking system and a parking locking working method for an electric vehicle, which are used for solving the problems of inconvenient installation of a locking mechanism, complex structure and possible jamming when a pawl is engaged into a groove of a ratchet wheel in the prior art. To achieve the above and other related objects, the present invention provides a motor parking lock system of an electric vehicle, comprising: The ratchet wheel is fixedly sleeved on the output shaft of the motor; The pawl is in a V shape, and the right end of the pawl is in clamping fit with a groove on the ratchet wheel; one end of the return tension spring is fixedly connected to the motor, and the other end of the return tension spring is connected with the left end of the pawl; the stepping motor is arranged on the motor, a push rod is arranged on an output shaft of the stepping motor, and the push rod rotates along with the rotation of the output shaft of the stepping motor; the inclination angle sensor is used for detecting the inclination angle of the electric automobile; Detecting the rotation angle and the rotation speed of an output shaft of the motor by a rotation-transformation combination; the control system receives signals of the inclination angle sensor and the rotation change combination and sends signals to the motor and the stepping motor; the power module receives the signal of the control system and converts direct current of the electric automobile battery into three-phase alternating current with corresponding frequency matched with the rotating speed of the motor; the push rod pushes the right end of the pawl to be clamped with the groove of the ratchet wheel, and the return tension spring is in a tension state; when the push rod does not push the pawl, the right end of the pawl is disengaged from the groove of the ratchet wheel and is abutted against the push rod under the action of the retraction force of the return tension spring. Optionally, the push rod is of a type "sigma", an "O" shaped part of the push rod of the type "sigma" is fixedly sleeved on an output shaft of the stepper motor, and a protruding part of the push rod of the type "sigma" abuts against the pawl. Optionally, the protruding portion of the push rod of the "sigma" type abuts against the right portion of the pawl of the "V" type. Optionally, a hook is arranged on the inner side of the right part of the V-shaped pawl, and a butt bulge is arranged