Working condition mode switching method for extended-range hybrid assembly

Abstract

The invention provides an extended-range hybrid assembly working condition mode switching method which comprises the following steps: A, when it is detected that the output power of a pure electric motor reaches the rated maximum power, a hybrid extended-range mode is changed into a pure electric mode, an output shaft of the brake motor is meshed with a worm gear arranged on a connecting shaft of the fuel engine and the generator through a worm, and the brake motor rotates in the direction of the shutdown action of the output shaft of the tested fuel engine pulled by the generator, so that the output shaft stops rotating; b, when it is detected that the output power of the pure electric motor is lower than the rated power, the pure electric mode is changed into a fuel engine driving and power generating mode, a worm and a worm gear are disengaged, and interference to work of the fuel engine and a power generator is avoided; and C, when it is detected that the output power of the pure electric motor is lower than the maximum rated power but higher than the rated power, the fuel engine is used for driving, and the power generation mode is changed into the hybrid extended-range mode. According to the invention, stable switching of modes can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid vehicle accessories, and particularly relates to a method for switching operating mode of an extended-range hybrid powertrain. Background Art

[0002] Existing extended-range hybrid power systems include fuel engine drive, pure electric drive, and extended-range hybrid mode. When changing from the mode of fuel engine driving and generating electricity or extended-range hybrid mode to pure electric mode, although the fuel engine is turned off, its output shaft will still rotate under the action of inertia, and at the same time, the generator shaft will also rotate together under inertia, which may cause their rotational speeds to not match the requirements of the electric drive system, thus affecting the response speed of the system and even causing power fluctuations. The mechanical connection between the engine and the generator may continue to work, resulting in unnecessary friction and wear. This additional wear may accelerate the aging of system components and shorten their service life. Summary of the Invention

[0003] One of the purposes of the present invention is to provide a method for switching operating mode of an extended-range hybrid powertrain, which can achieve smooth switching when changing from the mode of fuel engine driving and generating electricity or extended-range hybrid mode to pure electric mode, improve the safety and efficiency of the mode switching process, and enable it to better meet the diverse requirements in the research and development process of new energy vehicles.

[0004] The method for switching operating mode of the extended-range hybrid powertrain includes the following steps: A. Detect the output power of the pure electric motor through a power sensor. When it is detected that the output power of the pure electric motor reaches the rated maximum power, the central control system of the hybrid vehicle controls the extended-range hybrid mode to change to pure electric mode. The output shaft of the braking motor meshes with a worm gear arranged on the connecting shaft of the measured fuel engine and the generator through a worm. The braking motor rotates in the direction of the shutdown action of the generator pulling the output shaft of the measured fuel engine, so that the output shaft stops rotating; B. When it is detected that the output power of the pure electric motor is lower than the rated power, the central control system of the hybrid vehicle controls the pure electric mode to change to the mode of fuel engine driving and generating electricity, and the worm is disengaged from the worm gear to avoid interfering with the operation of the fuel engine and the generator; C. When it is detected that the output power of the pure electric motor is lower than the maximum rated power but higher than the rated power, the central control system of the hybrid vehicle controls the mode of fuel engine driving and generating electricity to change to extended-range hybrid mode, and the worm remains disengaged from the worm gear.

[0005] The extended-range hybrid mode is specifically: the fuel engine drives the generator to charge the vehicle battery, and at the same time, the fuel engine does not drive the vehicle to travel, and the pure electric motor drives the vehicle to travel; The fuel engine driving and power generation mode is specifically: the fuel engine drives the generator to charge the vehicle battery and drives the vehicle at the same time, and the pure electric motor stops working; The pure electric mode is specifically as follows: the fuel engine drives the generator to charge the vehicle battery and drives the vehicle at the same time, and the pure electric motor stops working.

[0006] The meshing switching of the worm and the worm wheel is realized based on the extended-range hybrid assembly working mode switching auxiliary device, which includes a base, an electric telescopic column, a cylinder, an articulated seat, a transmission rod, a push rod, a worm seat, a worm, a worm wheel, and a brake motor; The base is installed on the bottom plate in the vehicle engine compartment, next to the connecting shaft of the fuel engine and the generator; the electric telescopic column is vertically installed on the rear part of the top surface of the base, and can be telescopic up and down in the vertical direction; the rear part of the cylinder side wall is hinged to the upper end of the electric telescopic column, and the piston rod of the cylinder extends from its front part; the hinge seat is installed on the front part of the top surface of the base, and the front end of the side wall of the cylinder is hinged and installed on the top of the hinge seat; the tail of the transmission rod is hinged to the front end of the piston rod of the cylinder; the tail of the push rod is hinged to the front end of the headquarters of the hinge seat; the front end of the transmission rod is hinged to the middle part of the push rod; a worm seat is fixedly set at the front end of the push rod, and a worm and a brake motor are respectively set on the worm seat at intervals in front and behind, and one end of the worm is connected to the output shaft of the brake motor; a worm wheel corresponding to the worm is provided on the connecting shaft of the fuel engine and the generator, and the action of the electric telescopic column and the cylinder can make the worm rotate downward and mesh with the worm wheel.

[0007] The base is provided with a power sensor for detecting the output power of the pure electric motor of the automobile and transmitting the power to the control device, which controls the linkage of the electric telescopic column and the cylinder to drive the worm to engage or disengage with the worm wheel.

[0008] The power sensor model is E4413A.

[0009] The control device is a PLC.

[0010] The worm seat includes a top plate, an ear plate, and a motor mounting plate. The middle part of the top surface of the top plate is fixedly connected to the front end of the push rod. The rear and middle parts of the bottom surface of the top plate are respectively provided with ear plates. The two ends of the worm can be rotatably mounted on the two ear plates; the motor mounting plate is connected to the front end of the top plate, and the brake motor is installed on the bottom surface of the motor mounting plate; the front end of the worm passes through the middle ear plate and is connected to the output shaft of the brake motor.

[0011] Above the rear part of the push rod, a limiting collar is provided. Both ends of the limiting collar are respectively hinged on the hinge seats, which are used to limit the lifting height of the rear part of the push rod.

[0012] A layer of sponge pad is provided between the base and the bottom plate in the vehicle engine compartment.

[0013] The beneficial effects of the present invention are as follows: The present invention can, according to the switching situation of the operating conditions of a hybrid vehicle, when changing from the mode of being driven by a fuel engine and generating electricity to the pure electric mode, timely engage and brake, and can effectively reduce the mechanical impact caused by the inertial rotation of the connecting shaft of the fuel engine and the generator. When it is necessary to start the fuel engine, it can timely disengage to avoid mechanical interference and collision loss. Moreover, based on the power sensor and the control device, it can automatically judge the mode switching timing, and timely engage and brake the worm and worm gear, or the worm and worm gear disengage. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a structural schematic diagram of the operating condition mode switching method of the range-extended hybrid assembly for Embodiment 1; The serial numbers in the drawings and the structures and names of each part are as follows: 1 - base, 2 - electric telescopic column, 3 - cylinder, 4 - hinge seat, 5 - transmission rod, 6 - push rod, 7 - worm seat, 8 - worm, 9 - worm wheel, 10 - braking motor, 11 - connecting shaft, 12 - power sensor, 13 - top plate, 14 - ear plate, 15 - motor mounting plate, 16 - limiting collar. Specific Embodiments

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the following further details the present invention with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Embodiment 1

[0017] The range-extended hybrid assembly operating condition mode switching method includes the following steps: A. Detect the output power of the pure electric motor through a power sensor. When it is detected that the output power of the pure electric motor reaches the rated maximum power, the central control system of the hybrid vehicle controls the hybrid extended-range mode to change to the pure electric mode. The output shaft of the braking motor 10 meshes with the worm gear 9 provided on the connecting shaft 11 of the measured fuel engine and the generator through the worm 8. The braking motor 10 rotates in the direction of the shutdown action of the output shaft of the generator pulling the measured fuel engine, so that the output shaft stops rotating; B. When it is detected that the output power of the pure electric motor is lower than the rated power, the central control system of the hybrid vehicle controls the pure electric mode to change to the fuel engine drive and power generation mode, and the worm 8 and the worm gear 9 are disengaged to avoid interfering with the operation of the fuel engine and the generator; C. When it is detected that the output power of the pure electric motor is lower than the maximum rated power but higher than the rated power, the central control system of the hybrid vehicle controls the fuel engine drive and power generation mode to change to the hybrid extended-range mode, and the worm 8 and the worm gear 9 remain disengaged.

[0018] The specific hybrid extended-range mode is as follows: The fuel engine drives the generator to charge the vehicle battery. At the same time, the fuel engine does not drive the vehicle, and the pure electric motor drives the vehicle. The specific fuel engine drive and power generation mode is as follows: The fuel engine drives the generator to charge the vehicle battery and drives the vehicle at the same time, and the pure electric motor stops working. The specific pure electric mode is as follows: The fuel engine drives the generator to charge the vehicle battery and drives the vehicle at the same time, and the pure electric motor stops working.

[0019] The meshing and switching of the worm 8 and the worm gear 9 are realized based on the auxiliary device for switching the operating mode of the extended-range hybrid assembly. For example, Figure 1 The shown extended-range hybrid assembly operating mode switching auxiliary device includes a base 1, an electric telescopic column 2, a cylinder 3, a hinge seat 4, a transmission rod 5, a push rod 6, a worm seat 7, a worm 8, a worm gear 9, and a braking motor 10; The base 1 is installed on the bottom plate in the vehicle engine compartment, next to the connecting shaft 11 of the fuel engine and the generator; the electric telescopic column 2 is vertically installed on the rear part of the top surface of the base 1, and can be telescopic up and down in the vertical direction; the rear part of the side wall of the cylinder 3 is hinged to the upper end of the electric telescopic column 2, and the piston rod of the cylinder 3 extends from its front part; the articulated seat 4 is installed on the front part of the top surface of the base 1, and the front end of the side wall of the cylinder 3 is hinged to the top of the articulated seat 4; the tail of the transmission rod 5 is hinged to the The front end of the piston rod; the tail of the push rod 6 is hinged at the front end of the headquarters of the hinge seat 4; the front end of the transmission rod 5 is hinged to the middle part of the push rod 6; the front end of the push rod 6 is fixedly provided with a worm seat 7, and a worm 8 and a brake motor 10 are respectively provided on the front and rear intervals of the worm seat 7, and one end of the worm 8 is connected to the output shaft of the brake motor 10; a worm wheel 9 corresponding to the worm 8 is provided on the connecting shaft 11 of the fuel engine and the generator, and the action of the electric telescopic column 2 and the cylinder 3 can make the worm 8 rotate downward and mesh with the worm wheel 9.

[0020] The base 1 is provided with a power sensor 12 for detecting the output power of the pure electric motor of the automobile and transmitting it to the control device, which controls the linkage of the electric telescopic column 2 and the cylinder 3 to drive the worm 8 to engage or disengage with the worm wheel 9. The power sensor 12 model is E4413A. The control device is a PLC.

[0021] The worm seat 7 includes a top plate 13, an ear plate 14, and a motor mounting plate 15. The middle part of the top surface of the top plate 13 is fixedly connected to the front end of the push rod 6. The rear and middle parts of the bottom surface of the top plate 13 are respectively provided with ear plates 14. The two ends of the worm 8 can be rotatably mounted on the two ear plates 14; the motor mounting plate 15 is connected to the front end of the top plate 13, and the brake motor 10 is installed on the bottom surface of the motor mounting plate 15; the front end of the worm 8 passes through the middle ear plate 14 and is connected to the output shaft of the brake motor 10.

[0022] A limit collar 16 is provided above the rear of the push rod 6, and both ends of the limit collar 16 are respectively hinged on the hinge seat 4 to limit the height of the rear of the push rod 6. A layer of sponge pad is provided between the base 1 and the bottom plate in the vehicle engine compartment.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for switching operating modes of an extended-range hybrid powertrain assembly, characterized in that: The following steps are involved: A. The output power of the pure electric motor is detected by a power sensor. When it is detected that the output power of the pure electric motor reaches the rated maximum power, the central control system of the hybrid vehicle controls the hybrid range-extending mode to change to the pure electric mode. The output shaft of the brake motor (10) is meshed with the worm gear (9) provided on the connecting shaft (11) between the tested fuel engine and the generator through the worm gear (8). The brake motor (10) rotates in the direction of the shutdown action of the output shaft of the tested fuel engine pulled by the generator, so that the output shaft stops rotating. B. When it is detected that the output power of the pure electric motor is lower than the rated power, the central control system of the hybrid vehicle controls the pure electric mode to change to the fuel engine driven and power generation mode, and the worm (8) and the worm wheel (9) are disengaged to avoid interfering with the operation of the fuel engine and the generator; C. When it is detected that the output power of the pure electric motor is lower than the maximum rated power but higher than the rated power, the central control system of the hybrid vehicle controls the fuel engine to drive and change the power generation mode to the hybrid range-extended mode, and the worm (8) and the worm wheel (9) remain in a disengaged state.

2. The extended-range hybrid powertrain operating mode switching method according to claim 1, characterized in that: The hybrid extended-range mode is specifically: the fuel engine drives the generator to charge the vehicle battery, while the fuel engine does not drive the vehicle, and the vehicle is driven by the pure electric motor; The fuel engine driving and power generation mode is specifically: the fuel engine drives the generator to charge the vehicle battery and drives the vehicle at the same time, and the pure electric motor stops working; The pure electric mode is specifically as follows: the fuel engine drives the generator to charge the vehicle battery and drives the vehicle at the same time, and the pure electric motor stops working.

3. The extended-range hybrid powertrain operating mode switching method according to claim 1, characterized in that: The meshing switching of the worm (8) and the worm wheel (9) is achieved based on an extended-range hybrid powertrain assembly working mode switching auxiliary device, which comprises a base (1), an electric telescopic column (2), a cylinder (3), an articulated seat (4), a transmission rod (5), a push rod (6), a worm seat (7), a worm (8), a worm wheel (9), and a brake motor (10); The base (1) is mounted on the bottom plate of the vehicle engine compartment, and is located next to the connecting shaft (11) of the fuel engine and the generator; the electric telescopic column (2) is vertically mounted on the rear part of the top surface of the base (1), and can be telescopically extended up and down in the vertical direction; the rear part of the side wall of the cylinder (3) is hinged to the upper end of the electric telescopic column (2), and the piston rod of the cylinder (3) extends from the front part thereof; the hinge seat (4) is mounted on the front part of the top surface of the base (1), and the front end of the side wall of the cylinder (3) is hinged to the top of the hinge seat (4); the tail end of the transmission rod (5) is hinged to the front end of the piston rod of the cylinder (3) The tail of the push rod (6) is hinged to the front end of the headquarters of the hinge seat (4); the front end of the transmission rod (5) is hinged to the middle part of the push rod (6); a worm seat (7) is fixedly arranged at the front end of the push rod (6); a worm (8) and a brake motor (10) are arranged on the worm seat (7) at intervals in front and back, respectively, and one end of the worm (8) is connected to the output shaft of the brake motor (10); a worm wheel (9) corresponding to the worm (8) is arranged on the connecting shaft (11) of the fuel engine and the generator, and the electric telescopic column (2) and the cylinder (3) can cause the worm (8) to rotate downward and mesh with the worm wheel (9) when the electric telescopic column (2) and the cylinder (3) are moved.

4. The extended-range hybrid powertrain operating mode switching method according to claim 3, characterized in that: The base (1) is provided with a power sensor (12) for detecting the output power of the pure electric motor of the vehicle and transmitting the power to the control device, which controls the linkage of the electric telescopic column (2) and the cylinder (3) to drive the worm (8) to mesh with or disengage the worm wheel (9).

5. The extended-range hybrid powertrain operating mode switching method according to claim 3, characterized in that: The power sensor (12) is of model E4413A.

6. The extended-range hybrid powertrain operating mode switching method according to claim 2, characterized in that: The control device is a PLC.

7. The extended-range hybrid powertrain operating mode switching method according to claim 2, characterized in that: The worm seat (7) comprises a top plate (13), an ear plate (14), and a motor mounting plate (15); the middle portion of the top surface of the top plate (13) is fixedly connected to the front end of the push rod (6); the rear and middle portions of the bottom surface of the top plate (13) are provided with ear plates (14), respectively; the two ends of the worm (8) are rotatably mounted on the two ear plates (14); the motor mounting plate (15) is connected to the front end of the top plate (13), and the brake motor (10) is mounted on the bottom surface of the motor mounting plate (15); the front end of the worm (8) passes through the middle ear plate (14) and is connected to the output shaft of the brake motor (10).

8. The extended-range hybrid powertrain operating mode switching method according to claim 2, characterized in that: A limiting collar (16) is provided above the rear portion of the push rod (6), and both ends of the limiting collar (16) are respectively hinged on the hinge seat (4) to limit the height of the rear portion of the push rod (6) being lifted.

9. The extended-range hybrid powertrain operating mode switching method according to claim 2, characterized in that: A layer of sponge pad is provided between the base (1) and the bottom plate in the vehicle engine compartment.

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