CN114684142A - REV vehicle type power assembly vibration damping control system and control method - Google Patents

Abstract

The invention relates to the technical field of vehicle power system control, in particular to an REV vehicle type power assembly vibration damping control system and a control method. Gather the vibration information of engine, the generator, driving motor and reducing gear box in the power assembly under the vehicle hybrid mode through vibration sensor, and gather the collision pressure information of clutch and generator through pressure sensor, then send vibration information and collision pressure information for the damping treater and handle and calculate, send the signal by the damping treater again and give engine controller and reducing gear box controller, and then control the output torque and the rotational speed of engine and the drive ratio of reducing gear box, can reduce the vibration range and the collision probability of each part of power assembly, reduce the cabin noise, improve the life of power assembly, and promote the driving experience of vehicle.

Description

REV vehicle type power assembly vibration damping control system and control method

Technical Field

The invention relates to the technical field of vehicle power system control, in particular to an REV vehicle type power assembly vibration damping control system and a control method.

Background

With the development of new energy technology, REV (hybrid power) vehicles become the main force of the vehicle market, and REV vehicles have the characteristics of energy conservation, low emission and the like, thereby drawing great attention in the automobile industry and becoming a key point for automobile research and development.

The existing REV-type vehicle powertrain includes: the engine, the reduction gearbox, the generator, the driving motor, the battery and the clutch, because the REV type engine room is greatly influenced by the front overhang size, the vehicle width and the wheel track, the arrangement space of all parts of the power assembly is very limited; meanwhile, each part of the power assembly is limited by angle, size, hard point and performance temperature field, so that the arrangement clearance of each part is usually very small (less than or equal to 20 mm); when vehicle gear and output torque change, each part of power assembly can produce the vibration, and engine and the reducing gear box of especially REV motorcycle type can collide with other parts when the amplitude is great, causes the cabin abnormal sound, and loss part life seriously influences driving experience.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the damping control system and the damping control method for the REV vehicle type power assembly can intelligently adjust the output torque and the rotating speed of an engine according to the vibration condition of components of the power assembly, further reduce the vibration amplitude and the collision probability of the components of the power assembly, prolong the service life of the power assembly and improve the driving experience of a vehicle.

In order to solve the technical problems, the invention adopts the technical scheme that: a vibration reduction control system of an REV vehicle type power assembly comprises an engine 1, a generator 2, a driving motor 3, a battery 4, a clutch 5 and a reduction box 6 which are arranged in a front cabin of a vehicle, wherein a first vibration sensor 7 is arranged on the engine 1, a second vibration sensor 8 is arranged on the generator 2, a third vibration sensor 9 is arranged on the driving motor 3, and a fourth vibration sensor 10 is arranged on the reduction box 6; the side wall of the reduction box 6, which is opposite to the generator 2, is provided with a pressure sensor 11;

the vibration sensor I7, the vibration sensor II 8, the vibration sensor III 9, the vibration sensor IV 10 and the pressure sensor 11 are all electrically connected with a vibration reduction processor 12 arranged in the vehicle, the vibration reduction processor 12 is electrically connected with an engine controller and a reduction gearbox controller, and a memory 13 is arranged on the vibration reduction processor 12.

Further, the first vibration sensor 7, the second vibration sensor 8, the third vibration sensor 9 and the fourth vibration sensor 10 are respectively used for monitoring the amplitude information of the engine 1, the generator 2, the driving motor 3 and the reduction gearbox 6 and sending the amplitude information to the vibration reduction processor 12.

Further, the pressure sensor 11 is configured to monitor collision pressure information of the clutch 5 and the generator 2, and send the collision pressure information to the vibration damping processor 12.

Further, the engine controller is electrically connected to the engine 1, and is configured to control an output torque and a rotation speed of the engine 1.

Further, the reduction gearbox controller is electrically connected with the reduction gearbox 6 and is used for controlling the transmission ratio of the reduction gearbox 6.

Further, the first vibration sensor 7, the second vibration sensor 8, the third vibration sensor 9 and the fourth vibration sensor 10 are piezoelectric acceleration sensors;

the pressure sensor 11 is specifically a diffused silicon pressure sensor.

A damping control method of an REV vehicle type power assembly is based on the damping control system of the power assembly and comprises the following steps:

s1, judging whether the engine is started, if yes, continuing to execute the step S2, and if not, not carrying out the vibration reduction control of the power assembly;

s2, monitoring the amplitude L1 of the engine, the amplitude L2 of the generator, the amplitude L3 of the driving motor and the amplitude L4 of the reduction box in real time;

s3, judging whether L1, L2, L3 and L4 are all smaller than the safe amplitude L0, if not, continuing to execute the step S4, and if so, re-executing the step S1;

s4, detecting the pressure value N of the pressure sensor in real time;

s5, judging whether the pressure value N is smaller than the safe pressure value N0, if not, continuing to execute the step S6, if yes, re-executing the step S1;

s6, controlling the rotating speed V of the engine to be reduced by 20%, and simultaneously controlling the output torque T of the engine to be increased by 25%;

s7, controlling the transmission ratio K of the reduction gearbox to be reduced by 20%;

s8, step S1 is executed again.

Further, the specific calculation formula of the engine speed V and the engine output torque T is as follows:

wherein, the P is the rated power of the engine.

Further, the specific calculation formula of the transmission ratio K is as follows:

wherein, W is the current speed, R is the rolling radius of the tire, and V is the rotating speed of the engine.

A hybrid vehicle comprising a powertrain damping control system as described above.

Compared with the prior art, the invention has the following main advantages:

1. the vibration reduction control system for the REV vehicle type power assembly is characterized in that vibration information of an engine, a generator, a driving motor and a reduction gearbox in the power assembly in a hybrid mode of a vehicle is collected through a vibration sensor, collision pressure information of a clutch and the generator is collected through a pressure sensor, then the vibration information and the collision pressure information are sent to a vibration reduction processor for processing and calculation, and then the vibration reduction processor sends signals to an engine controller and a reduction gearbox controller to further control the output torque and the rotating speed of the engine and the transmission ratio of the reduction gearbox, so that the vibration amplitude and the collision probability of all parts of the power assembly can be reduced, the cabin noise is reduced, and the service life of the power assembly is prolonged;

2. the method comprises the steps of judging and processing according to vibration information fed back by a vibration sensor and collision pressure information fed back by a pressure sensor, further controlling the output torque and the rotating speed of an engine and the transmission ratio of a reduction gearbox, reducing the amplitude of each part of the power assembly, ensuring that the engine is at rated power, and keeping the running speed of a vehicle unchanged;

3. the optimal output torque, the rotating speed and the optimal transmission ratio under the current vehicle speed are recorded by arranging the memory according to the processing result of the vibration reduction processor, and when the vehicle is in a hybrid mode and at the same vehicle speed next time, the recorded optimal output torque, the recorded optimal rotating speed and the recorded optimal transmission ratio can be directly applied to the engine and the reduction gearbox, so that the vibration reduction efficiency of the vibration reduction control system of the power assembly is further improved, and the driving experience of the vehicle is further improved.

Drawings

FIG. 1 is a schematic overall view of an REV-type powertrain of the present invention;

FIG. 2 is a schematic view of the damping control system of the REV vehicle type powertrain of the present invention;

FIG. 3 is a flow chart of a control method according to the present invention.

In the figure: 1. an engine; 2. a generator; 3. a drive motor; 4. a battery; 5. a clutch; 6. a reduction gearbox; 7. a first vibration sensor; 8. a second vibration sensor; 9. a third vibration sensor; 10. a vibration sensor IV; 11. a pressure sensor; 12. a vibration reduction processor; 13. a memory.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.

A power assembly of an REV (hybrid electric) vehicle type is shown in fig. 1, and includes an engine 1, a generator 2, a drive motor 3, a battery 4, a clutch 5, and a reduction gearbox 6.

The generator 2 is directly connected with the engine 1 for generating power and storing the power into the battery 4; the engine 1 and the driving motor 3 are used for outputting power, the clutch 5 is arranged behind the engine 1 and used for switching a transmission state, and the reduction gearbox 6 is used for changing a transmission ratio and expanding the variation range of torque and rotating speed of the driving wheel.

When the REV type is in the pure electric mode, the engine 1 does not run, other components run relatively stably, and the possibility of collision is avoided;

in the hybrid mode of the REV type, the vibration amplitude and the collision probability of each component of the power assembly are mainly related to the output rotating speed of the engine, and the larger the vibration amplitude and the collision probability of the output rotating speed of the engine is.

According to experience, the most possible colliding state is a state that the rotating speed of the engine is increased from 0, and the most possible colliding parts are a reduction gearbox and a generator.

REV vehicle type power assembly vibration damping control system

According to the REV vehicle type power assembly vibration damping control system implemented by the invention, as shown in FIG. 2, a first vibration sensor 7 is installed on an engine 1, a second vibration sensor 8 is installed on a generator 2, a third vibration sensor 9 is installed on a driving motor 3, and a fourth vibration sensor 10 is installed on a reduction gearbox 6; meanwhile, a pressure sensor 11 is arranged on the side wall of the reduction box 6, which is opposite to the generator 2; the vibration sensor I7, the vibration sensor II 8, the vibration sensor III 9, the vibration sensor IV 10 and the pressure sensor 11 are all electrically connected with a vibration reduction processor 12, the vibration reduction processor 12 is electrically connected with an existing engine controller and a reduction gearbox controller of a vehicle, and a memory 13 is arranged on the vibration reduction processor 12.

The vibration sensor I7, the vibration sensor II 8, the vibration sensor III 9 and the vibration sensor IV 10 are respectively used for monitoring the amplitude information of the engine 1, the generator 2, the driving motor 3 and the reduction box 6 and sending the amplitude information to the vibration reduction processor 12;

the pressure sensor 11 is used for monitoring collision pressure information of the clutch 5 and the generator 2 and sending the collision pressure information to the vibration reduction processor 12;

the vibration reduction processor 12 is used for processing and judging the amplitude information and the collision pressure information and sending a control instruction to an existing engine controller and a reduction gearbox controller of the vehicle;

the memory 13 is used for recording the optimal output torque, the rotating speed and the optimal transmission ratio under the current vehicle speed according to the processing result of the vibration reduction processor, and when the vehicle is in a hybrid mode and at the same vehicle speed next time, the recorded optimal output torque, the recorded optimal rotating speed and the recorded optimal transmission ratio can be directly applied to the engine and the reduction gearbox, so that the vibration reduction efficiency of the vibration reduction control system of the power assembly is further improved, and the driving experience of the vehicle is further improved.

Further, the engine controller is electrically connected to the engine 1, and is configured to control an output torque and a rotation speed of the engine 1.

Further, the reduction gearbox controller is electrically connected with the reduction gearbox 6 and is used for controlling the transmission ratio of the reduction gearbox 6.

Furthermore, the first vibration sensor 7, the second vibration sensor 8, the third vibration sensor 9 and the fourth vibration sensor 10 are piezoelectric acceleration sensors; the pressure sensor 11 is specifically a diffused silicon pressure sensor.

Second, REV vehicle type power assembly vibration damping control method

Based on the same inventive concept, the embodiment of the present application further provides a REV vehicle type powertrain damping control method, based on the powertrain damping control system, as shown in fig. 3, specifically including the following steps:

s1, judging whether the engine is started, if yes, continuing to execute the step S2, and if not, not carrying out the vibration reduction control of the power assembly;

s2, monitoring the amplitude L1 of the engine, the amplitude L2 of the generator, the amplitude L3 of the driving motor and the amplitude L4 of the reduction box in real time;

s3, determining whether L1, L2, L3, and L4 are all smaller than the safe amplitude L0 (specifically 20mm in this example), if not, continuing to execute step S4, and if yes, re-executing step S1;

s4, detecting the pressure value N of the pressure sensor in real time;

s5, determining whether the pressure value N is less than the safety pressure value N0 (specifically, 0.5kpa in this example), if not, continuing to execute step S6, and if yes, re-executing step S1;

s6, controlling the rotation speed V of the engine to reduce by 20 percent and controlling the output torque T of the engine to increase by 25 percent;

s7, controlling the transmission ratio K of the reduction gearbox to be reduced by 20%;

s8, re-executing step S1.

Further, the specific calculation formula of the engine speed V and the engine output torque T is as follows:

wherein, P is the rated power of the engine and has the unit of w; v is the output rotating speed of the engine, and the unit is rpm; t is engine output torque in units of N.m.

Further, the specific calculation formula of the transmission ratio K is as follows:

wherein, W is the current speed, and the unit is km/h; r is the rolling radius of the tire; v is the engine speed; k is the transmission ratio of the reduction gearbox.

By adopting the method, the following steps can be realized: the vibration amplitude of each part of the power system is reduced by reducing the rotating speed V of the engine, the collision pressure between the reduction box and the generator is reduced, the output torque T of the engine is increased and the transmission ratio K is reduced according to the calculation formulas of the output torque T of the engine, the transmission ratio K and the rotating speed V of the engine, the output power of the engine can be ensured to be always kept at the rated power (the optimal output power), and the current vehicle speed is kept unchanged.

In summary, the REV vehicle type power assembly vibration damping control system and the control method of the invention are adopted:

1. the vibration sensor is used for acquiring vibration information of an engine, a generator, a driving motor and a reduction gearbox in the power assembly in a hybrid mode of the vehicle, the pressure sensor is used for acquiring collision pressure information of a clutch and the generator, then the vibration information and the collision pressure information are sent to the vibration reduction processor for processing and calculation, and then the vibration reduction processor sends signals to the engine controller and the reduction gearbox controller so as to control the output torque and the rotating speed of the engine and the transmission ratio of the reduction gearbox, so that the vibration amplitude and the collision probability of all parts of the power assembly can be reduced, the cabin noise is reduced, and the service life of the power assembly is prolonged;

2. judging and processing according to vibration information fed back by the vibration sensor and collision pressure information fed back by the pressure sensor, and further controlling the output torque and the rotating speed of the engine and the transmission ratio of the reduction gearbox, so that the amplitude of each part of the power assembly is reduced, the engine can be ensured to be at rated power, and the running speed of the vehicle is kept unchanged;

3. the optimal output torque, the rotating speed and the optimal transmission ratio under the current vehicle speed are recorded by arranging the memory according to the processing result of the vibration reduction processor, and when the vehicle is in a hybrid mode and at the same vehicle speed next time, the recorded optimal output torque, the recorded optimal rotating speed and the recorded optimal transmission ratio can be directly applied to the engine and the reduction gearbox, so that the vibration reduction efficiency of the vibration reduction control system of the power assembly is further improved, and the driving experience of the vehicle is further improved.

Based on the same inventive concept, the embodiment of the application also provides a hybrid vehicle which comprises the REV vehicle type power assembly vibration damping control system.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A vibration damping control system of an REV vehicle type power assembly comprises an engine (1), a generator (2), a driving motor (3), a battery (4), a clutch (5) and a reduction gearbox (6) which are arranged in a front cabin of a vehicle, and is characterized in that a first vibration sensor (7) is installed on the engine (1), a second vibration sensor (8) is installed on the generator (2), a third vibration sensor (9) is installed on the driving motor (3), and a fourth vibration sensor (10) is installed on the reduction gearbox (6); a pressure sensor (11) is arranged on the side wall of the reduction gearbox (6) opposite to the generator (2);

the vibration sensor I (7), the vibration sensor II (8), the vibration sensor III (9), the vibration sensor IV (10) and the pressure sensor (11) are all electrically connected with a vibration reduction processor (12) arranged in the vehicle, the vibration reduction processor (12) is electrically connected with an engine controller and a reduction gearbox controller, and a memory (13) is arranged on the vibration reduction processor (12).

2. The REV vehicle type powertrain damping control system of claim 1, wherein the first vibration sensor (7), the second vibration sensor (8), the third vibration sensor (9), and the fourth vibration sensor (10) are respectively configured to monitor amplitude information of the engine (1), the generator (2), the driving motor (3), and the reduction gearbox (6), and to send the amplitude information to the damping processor (12).

3. An REV-type powertrain damping control system according to claim 1, characterized in that said pressure sensor (11) is adapted to monitor the collision pressure information of said clutch (5) and generator (2) and to send said collision pressure information to the damping processor (12).

4. An REV-type powertrain damping control system according to claim 1, characterized in that said engine controller is electrically connected to said engine (1) for controlling the output torque and speed of the engine (1).

5. The REV-type powertrain damping control system of claim 1, wherein said reduction gearbox controller is electrically connected to said reduction gearbox (6) for controlling the transmission ratio of the reduction gearbox (6).

6. The REV-type powertrain damping control system of claim 1, wherein said first (7), second (8), third (9) and fourth (10) vibration sensors are piezoelectric acceleration sensors;

the pressure sensor (11) is specifically a diffused silicon pressure sensor.

7. An REV vehicle type power assembly vibration damping control method is based on the power assembly vibration damping control system of any one of claims 1-6, and is characterized by comprising the following steps:

s1, judging whether the engine is started, if yes, continuing to execute the step S2, and if not, not carrying out the vibration reduction control of the power assembly;

s2, monitoring the amplitude L1 of the engine, the amplitude L2 of the generator, the amplitude L3 of the driving motor and the amplitude L4 of the reduction box in real time;

s3, judging whether L1, L2, L3 and L4 are all smaller than the safe amplitude L0, if not, continuing to execute the step S4, and if so, re-executing the step S1;

s4, detecting the pressure value N of the pressure sensor in real time;

s5, judging whether the pressure value N is smaller than the safe pressure value N0, if not, continuing to execute the step S6, if yes, re-executing the step S1;

s6, controlling the rotation speed V of the engine to reduce by 20 percent and controlling the output torque T of the engine to increase by 25 percent;

s7, controlling the transmission ratio K of the reduction gearbox to be reduced by 20%;

s8, step S1 is executed again.

8. The REV vehicle powertrain damping control method of claim 7, wherein said specific calculation formula of engine speed V and engine output torque T is as follows:

wherein, the P is the rated power of the engine.

9. The REV-type powertrain damping control method according to claim 7, wherein the specific calculation formula of the transmission ratio K is as follows:

wherein, W is the current speed, R is the rolling radius of the tire, and V is the rotating speed of the engine.

10. A hybrid vehicle comprising the powertrain damping control system according to any one of claims 1 to 6.

Images