CN102001277A - Hybrid drive system, control method thereof and vehicle with hybrid drive system - Google Patents

Abstract

The invention provides a hybrid drive system, a control method thereof and a vehicle with the hybrid drive system. The control method comprises the following steps: step 100, a first control unit is used for detecting speed V of a vehicle and sending a speed signal to a second control unit, and the second control unit is used for detecting cooled water temperature T of an engine; step 200, the second control unit carries out comparison on V and T, when V is equal to zero and T is more than or equal to the default value T0, step 300 is performed; when V is not equal to zero or T is less than T0, a system returns to the step 100 to continue to detect; step 300, whether the time that the second control unit detects V exceeds t, if the time exceeds t, step 400 is performed, and otherwise, the system returns to the step 100 to continue to detect; step 400, the second control unit sends a virtual fault signal to a third control unit; step 500, the third control unit sends a forced fuel cut instruction to the engine; and step 600, the engine stops.

Description

Hybrid drive system, control method thereof, and vehicle including the drive system

technical field

The invention relates to the control technology of a hybrid drive system, in particular to a hybrid drive system, its control method and a vehicle containing the hybrid drive system.

Background technique

Since the 1990s, automobile companies in Japan, the United States, Europe and other regions have begun to study hybrid vehicles and have continuously put them on the market. At present, the structure of the hybrid drive system can be divided into: a series hybrid drive system, a parallel hybrid drive system, and a hybrid hybrid drive system. The serial type is a hybrid drive system composed of the engine, generator/drive motor in a "series" manner; the parallel type is composed of two major system assemblies of the engine and the motor/generator, and the power of the two can be superimposed. The hybrid type combines series and parallel structures and consists of three major powertrains: engine, motor/generator and drive motor.

my country has made a series of important achievements in the development of hybrid electric vehicles. Basically, two power input sources are used in the hybrid drive system, namely the engine and the motor. During operation, it is required to realize pure motor drive, pure engine drive, motor Hybrid drive with the engine. However, when the engine is involved in driving, in order to reduce emissions, the drive motor will drive the engine to a certain speed before starting to ignite and start the engine. In this way, the emissions of the hybrid drive system are effectively reduced.

However, at present, the fuel consumption of hybrid electric vehicles is very large when the engine is idling, and how to overcome this defect is a technical problem to be solved in the field of hybrid electric vehicles.

Contents of the invention

The invention aims to solve the problem of high fuel consumption of the hybrid drive system in the prior art when the engine is idling, and provides a hybrid drive system with low fuel consumption and a control method thereof.

A hybrid drive system, the hybrid drive system includes an engine, a clutch, a first motor, a second motor, an energy storage device, a speed reduction mechanism, a first control unit for controlling the operation of the hybrid drive system, and a second control unit for controlling the operation of the engine Two control units and a third control unit that controls the operation of the first motor, wherein the engine is connected to the speed reduction mechanism through a clutch, the energy storage device is electrically connected to the first motor and the second motor, and the second motor is connected to the speed reduction mechanism. The mechanism is connected, the engine is connected to the first motor, and the second control unit and the third control unit are respectively electrically connected to the first control unit;

The first control unit is used to detect various signals of the hybrid drive system and transmit the detected signals to the second control unit;

The second control unit is configured to analyze and process the signal detected by the first control unit and send a corresponding control signal to the third control unit;

The third control unit is configured to perform corresponding actions according to the control signal of the second control unit.

The present invention also provides a control method of the above-mentioned hybrid drive system, the control method comprising:

The first control unit detects various signals of the hybrid drive system and transmits the detected signals to the second control unit;

The second control unit analyzes and processes the signal detected by the first control unit and sends a corresponding control signal to the third control unit;

The third control unit performs corresponding actions to control the engine to start or stop according to the control signal of the second control unit.

The present invention also provides a hybrid vehicle, which has the above-mentioned hybrid drive system.

Through the above technical solutions, comprehensive analysis is carried out by detecting the speed of the vehicle and the water temperature of the engine. When the conditions for stopping the engine at idle speed are satisfied, the third control unit sends a forced fuel cut command to the engine controller to stop the engine. In this way, the fuel consumption problem of the hybrid vehicle engine is effectively reduced, and the emission is also effectively reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic block diagram of an embodiment of a hybrid drive system provided by the present invention;

Fig. 2 is a schematic schematic diagram of a preferred embodiment of the hybrid drive system provided by the present invention;

Fig. 3 is a schematic block diagram of another embodiment of the hybrid drive system provided by the present invention;

Fig. 4 is a simplified block diagram of the control system of the hybrid drive system provided by the present invention;

Fig. 5 is the control flow chart of engine idling shutdown of the hybrid drive system provided by the present invention;

Fig. 6 is a control flow chart of starting the engine of the hybrid drive system provided by the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

1 and 4, the hybrid drive system provided by the present invention includes: an engine 100, a clutch 200, a first motor 300, a second motor 400, an energy storage device 500, a reduction mechanism 600, and a hybrid drive system that controls the operation A first control unit for controlling the operation of the engine 100 and a third control unit for controlling the operation of the first motor 300 . Wherein the engine 100 is connected to the reduction mechanism 600 through the clutch 200, the energy storage device 500 is electrically connected to the first motor 300 and the second motor 400 respectively, the second motor 400 is connected to the reduction mechanism 600, and the engine 100 It is connected with the first motor 300, and the second control unit and the third control unit are respectively electrically connected with the first control unit.

As a preferred embodiment, in this solution, the first control unit is preferably the vehicle controller of the hybrid drive system-main control ECU, the second control unit is preferably the engine controller-engine ECU, and the third control unit is preferably First Motor Controller - MCU1.

As a further improvement, the hybrid drive system further includes a fourth control unit for controlling the operation of the second motor 400, and the fourth control unit is electrically connected with the first control unit. Preferably, the fourth control unit is the second motor controller-MCU2.

The third control unit controls the start, stop and adjustment of the rotating speed of the first motor 300 and communicates constantly with the second control unit; Start, stop and speed adjustment and communicate with the third control unit; the first control unit detects and analyzes various signals of the vehicle, including vehicle speed signal, battery power signal, engine body cooling water temperature signal, and operation of the hybrid drive system Mode signals, etc., and control the vehicle to run in the corresponding mode. The working modes of the hybrid drive system in this invention include pure electric mode, series mode, parallel mode, hybrid mode, three power source mode, or engine mode.

As shown in FIG. 2 , according to a preferred embodiment of the present invention, in the hybrid drive system, the clutch 200 has a clutch cover 201 , and the engine 100 is connected to the first motor 300 through the clutch cover 201 .

Wherein, the engine 100 may be a gasoline engine, a diesel engine, or other fuel engines such as methanol and ethanol, and the like. The engine 100 is connected to the reduction mechanism 600 through the clutch 200 , so that when the clutch 200 is engaged, when the engine 100 is working, the power of the engine 100 can be transmitted to the reduction mechanism 600 through the clutch 200 . The engine 100 is connected with the first motor 300 through the clutch cover 201 of the clutch 200, so when the engine 100 works, no matter whether the clutch 200 is engaged or not, the first motor 300 will be driven by the engine 100 to run, and when the first motor 300 works , will also drive the engine 100 to run.

The first motor 300 may be an AC motor, a switched reluctance motor, a DC permanent magnet motor and the like. According to the principle of electromagnetic induction, the first motor 300 can work in either generator mode or motor mode. When operating in generator mode, it is used to convert mechanical energy into electrical energy. When operating in motor mode, it is used to convert electrical energy into mechanical energy. Specifically, when the engine 100 is working, the engine 100 drives the first motor 300 to work in a generator mode, so as to convert the kinetic energy of the engine 100 into electrical energy and output it to the energy storage device 500 . When the energy storage device 500 supplies power to the first motor 300 , the first motor 300 works in a motor mode to convert electric energy into kinetic energy and output it to the engine 100 , that is, to drive the engine 100 to work.

The second motor 400 may be an AC motor, a switched reluctance motor, a DC permanent magnet motor and the like. According to the principle of electromagnetic induction, the second motor 400 can work in either generator mode or motor mode. When operating in generator mode, it is used to convert mechanical energy into electrical energy. When operating in motor mode, it is used to convert electrical energy into mechanical energy. Specifically, when the kinetic energy transmitted by the reduction mechanism 600 is transmitted to the second motor 400 , the second motor 400 works in a generator mode to convert the kinetic energy of the reduction mechanism 600 into electrical energy and output it to the energy storage device 500 . When the energy storage device 500 supplies power to the second motor 400 , the second motor 400 works in a motor mode to convert electric energy into kinetic energy and output it to the reduction mechanism 600 .

The energy storage device 500 is a controllable energy storage device, such as a battery pack, a fuel cell pack, and the like. The reduction mechanism 600 can be a reduction gear, a transmission, etc., and as known to those skilled in the art, the power delivered to the reduction mechanism 600 can be finally transmitted to the vehicle wheels through couplings, wheel drive shafts, etc. to drive the vehicle.

Preferably, as shown in FIG. 3 , the hybrid drive system provided by the present invention further includes a switch unit 501, the switch unit 501 is used to control the on-off of the electrical connection between the energy storage device 500 and the first motor 300, for example, It is placed between the energy storage device 500 and the first electric machine 300 . When the engine 100 is working, the engine 100 drives the first motor 300 to work in generator mode, so that the first motor 300 converts mechanical energy into electrical energy. 501 disconnects the electrical connection between the energy storage device 500 and the first motor 300 , so that the first motor 300 is in an idling state without load, and therefore does not output electric energy to the outside. At this time, since the kinetic energy driving the first motor 300 to idle is very small, it can be ignored.

Preferably, the energy storage device 500 has an external charging interface (not shown in the figure), through which the external power supply can be used to directly charge the energy storage device 500, for example, it can be directly charged by a household power supply. , thus greatly improving the convenience of use.

Preferably, the hybrid drive system provided by the present invention further includes a detection unit (not shown in the figure), the detection unit is electrically connected to the energy storage device 500, and is used to detect the storage capacity of the energy storage device 500. energy state, that is, for detecting the state of charge of the energy storage device 500 . For example, it can be set as required: when the detection unit detects that the state of charge of the energy storage device 500 is greater than 40%, it means that the energy storage device 500 has sufficient energy storage; When the state of charge of the energy storage device 500 is less than or equal to 40% but greater than 15%, it means that the energy storage device 500 is in a state of insufficient energy storage; when the detection unit detects that the state of charge of the energy storage device 500 is less than or When it is equal to 15%, it means that the energy storage device 500 is in a seriously insufficient energy storage state.

Next, the control method of the hybrid drive system provided by the present invention will be described in detail.

The hybrid drive system provided by the present invention mainly includes:

The first control unit detects various signals of the hybrid drive system and transmits the detected signals to the second control unit;

The second control unit analyzes and processes the signal detected by the first control unit and sends a corresponding control signal to the third control unit;

The third control unit performs corresponding actions to control the engine to start or stop according to the control signal of the second control unit.

As shown in Figure 5, after the system starts to work, it enters step S100. The vehicle speed sensor detects the vehicle speed V of the hybrid drive system vehicle from time to time, and sends the vehicle speed V to the first control unit, and the first control unit then passes the CAN bus. V is transmitted to the second control unit, while the first control unit detects the temperature T of the cooling water of the engine body through the cooling water temperature sensor and transmits the temperature T to the second control unit;

Step S200, the second control unit calculates and analyzes the value V of the vehicle speed, and compares the cooling water temperature T with its preset value T0. When the second control unit detects that V=0 and T is greater than or equal to its preset value T0, enter Step S300; when the second control unit detects that V≠0 or T is less than T0, the system returns to step S100 to continue detection;

Step S300, the second control unit continues to analyze the vehicle speed value V, the second control unit detects whether V=0 lasts for more than t, if yes, enters step S400, otherwise returns to step S100 to continue detection;

Step S400, the second control unit detects that T≥T0 and the vehicle speed V=0 lasts for more than t, and at this time the second control unit sends a virtual fault signal to the third control unit;

Step S500, after receiving the virtual fault signal, the third control unit sends a forced fuel cut-off command to the engine controller, and the system enters the next step;

In step S600, the engine 100 is cut off from oil, and the engine 100 is stopped.

Through the above control, the stop control when the vehicle is stopped and the engine is idling can be realized, which effectively reduces the fuel consumption when the engine is idling in the hybrid drive system, and at the same time reduces emissions and pollution. Equally, the hybrid drive system of the present invention also provides flow control when the engine is restarted, as follows:

As shown in Figure 6, the system first enters step S10, the vehicle speed sensor detects the vehicle speed value V of the hybrid drive system vehicle, and sends the detected vehicle speed value V to the first control unit, and the first control unit then transmits the vehicle speed value V to the first control unit through the CAN bus. The vehicle speed value V is sent to the second control unit, and the system enters step S20;

Step S20, the second control unit calculates and analyzes the magnitude of the vehicle speed value V, and compares the vehicle speed value V with its internal set value V0, if V≥V0, the system enters step S30; if V<V0, the system stops working.

Step S30, the second control unit continues to analyze the vehicle speed value V, the second control unit detects whether V≥V0 lasts longer than t, if yes, enters step S40; if not, directly ends the work;

Step S40, the second control unit detects that the vehicle speed V≥V0 and the duration is longer than t, at this time the third control unit sends a request to start the engine to the second control unit, and then the system enters step S50;

Step S50, the cooling water temperature sensor detects the temperature T of the cooling water temperature of the engine body, and transmits the water temperature signal T to the second control unit;

Step S60, the second control unit analyzes the water temperature T after receiving it, and compares it with the preset value T0, if T≥T0, then enters step S70; if T<T0, enters step S80;

Step S70, the second control unit controls the oxygen sensor to heat the engine 100, the heating time is t1, and the second control unit checks whether the oxygen heating is completed from time to time, if yes, enter step S90, if not, the second control unit controls the oxygen sensor Continue oxygen heating;

Step S80, the second control unit controls the oxygen sensor to heat the engine 100, the heating time is t2, and the second control unit checks whether the oxygen heating is completed from time to time, if yes, enter step S90, if not, the second control unit controls the oxygen sensor Continue oxygen heating;

Step S90, at this time, the engine controller controls the engine to start, completing the engine restart.

In the above control process, the value range of the system preset water temperature T0 is 75°C-85°C, and the value of T0 is preferably 80°C; the preset value V0 is 2km/h-4km/h, preferably 3km/h The value of time t is 0.5s-1.5s, preferably 1s; the value range of oxygen heating time t1 is 2s-4s, the value range of t2 is 7s-9s, preferably, t1=3s, t2=8s .

The present invention also provides a hybrid vehicle, which includes the above-mentioned hybrid drive system. Because the hybrid vehicle has the above-mentioned hybrid drive system, the hybrid vehicle can work in different working modes. The working modes of the hybrid vehicle in this invention include pure electric mode, series mode, parallel mode, hybrid mode, Three power source mode, or engine mode.

For the hybrid vehicle of the present invention, when the engine is started, the first motor will drive the engine to reach a certain speed before starting to ignite and start the engine. In this way, the emission of the hybrid vehicle can be effectively reduced.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (17)

1. A hybrid drive system, characterized in that: the hybrid drive system includes an engine (100), a clutch (200), a first motor (300), a second motor (400), and an energy storage device (500) , a reduction mechanism (600), a first control unit for controlling the operation of a hybrid drive system, a second control unit for controlling the operation of the engine (100) and a third control unit for controlling the operation of the first motor (300), wherein the engine ( 100) is connected to the reduction mechanism (600) through the clutch (200), the energy storage device (500) is electrically connected to the first motor (300) and the second motor (400) respectively, and the second motor (400) is connected to the The reduction mechanism (600) is connected, the engine (100) is connected to the first motor (300), and the second control unit and the third control unit are respectively electrically connected to the first control unit; The first control unit is used to detect the signal of the hybrid drive system and transmit the detected signal to the second control unit; The second control unit is configured to analyze and process the signal detected by the first control unit and send a corresponding control signal to the third control unit; The third control unit is configured to perform corresponding actions according to the control signal of the second control unit. 2. The hybrid drive system according to claim 1, wherein the first control unit is a vehicle main controller ECU, the second control unit is an engine controller ECU, and the third control unit is The first motor controller MCU1. 3. The hybrid drive system according to claim 2, characterized in that the signals detected by the first control unit include a vehicle speed signal V and an engine block cooling water temperature signal T. 4. The hybrid drive system according to claim 1, characterized in that, the clutch (200) has a clutch cover (201), and the engine (100) communicates with the first motor (300) through the clutch cover (201) connected. 5. The hybrid drive system according to claim 1, characterized in that, the hybrid drive system further comprises a fourth control unit for controlling the operation of the second motor, the fourth control unit and the first control unit electrical connection. 6. A control method for a hybrid drive system as claimed in claim 1, characterized in that: The first control unit detects the signal of the hybrid drive system and transmits the detected signal to the second control unit; The second control unit analyzes and processes the signal detected by the first control unit and sends a corresponding control signal to the third control unit; The third control unit performs corresponding actions to control the engine to start or stop according to the control signal of the second control unit. 7. control method according to claim 6, is characterized in that, comprises the following steps: Step S100, the first control unit detects the vehicle speed signal V and the engine body cooling water temperature signal T and sends the vehicle speed signal V and the engine body cooling water temperature signal to the second control unit; Step S200, the second control unit compares the vehicle speed value V with the engine water temperature T; When V=0 and T is greater than or equal to its preset value T0, enter step S300; When V≠0 or T is less than T0, the system returns to step S100 to continue detection; Step S300, the second control unit detects whether V=0 lasts for more than t, if yes, enters step S400, if not, returns to step S100 to continue detection; Step S400, the second control unit sends a virtual fault signal to the third control unit; Step S500, the third control unit sends a forced fuel cut command to the engine controller; Step S600, stop the engine. 8. control method according to claim 6, is characterized in that, described control method also comprises the following steps: Step S10, the first control unit detects the vehicle speed signal V and sends the vehicle speed signal V to the second control unit; Step S20, the second control unit compares the magnitude of the vehicle speed value V, when V≥V0, the system enters step S30; when V<V0, the system stops working; Step S30, the second control unit detects whether V≥V0 lasts for more than t, if yes, the system enters step S40; if not, the system ends the work; Step S40, the third control unit sends an engine start request to the second control unit; Step S50, the first control unit detects the engine cooling water temperature signal T and sends the signal to the second control unit; Step S60, the second control unit compares the water temperature T, and when T≥T0, enters step S70; when T<T0, enters step S80; Step S70, the second control unit controls the engine to perform oxygen heating, and judges whether the oxygen heating time t1 has been reached, and if so, proceeds to step S90, otherwise, continues oxygen heating; Step S80, the second control unit controls the engine to perform oxygen heating, and judges whether the oxygen heating time t2 has been reached, and if so, proceeds to step S90, otherwise, continues oxygen heating; Step S90, the engine controller starts the engine. 9. The control method according to claim 7 or 8, wherein the first control unit is a vehicle main controller ECU, the second control unit is an engine controller ECU, and the third control unit is The first motor controller MCU1. 10. The control method according to claim 9, wherein the first control unit detects the vehicle speed signal V of the vehicle through a vehicle speed sensor. 11. The control method according to claim 9, characterized in that the first control unit detects the engine block cooling water temperature signal T through an engine cooling water temperature sensor. 12. The control method according to claim 9, characterized in that the range of the water temperature value T0 preset by the system is 75°C-85°C. 13. The control method according to claim 8, characterized in that, the value range of the preset value V0 of the system is 2km/h-4km/h. 14. The control method according to claim 8, characterized in that the value range of the oxygen heating time t1 is 2s-4s. 15. The control method according to claim 8, characterized in that the value range of the oxygen heating time t2 is 7s-9s. 16. The control method according to claim 7, characterized in that, the value of the time t is 0.5s-1.5s. 17. A hybrid vehicle, characterized in that the hybrid vehicle comprises the hybrid drive system according to any one of claims 1-5.

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