CN114228691A - Dynamic coordination control method and device for engine of hybrid electric vehicle - Google Patents
Dynamic coordination control method and device for engine of hybrid electric vehicle Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/20—Reducing vibrations in the driveline
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/20—Reducing vibrations in the driveline
- B60W2030/206—Reducing vibrations in the driveline related or induced by the engine
Abstract
The invention discloses a method and a device for dynamically coordinating and controlling an engine of a hybrid electric vehicle, which are applied to a coaxial series-parallel hybrid electric vehicle, wherein the coaxial series-parallel hybrid electric vehicle comprises the following components: the engine, the clutch 1, the motor 1, the clutch 2 and the motor 2 are connected in sequence. The method comprises the following steps: when the engine has a starting request, acquiring a starting mode of the engine; and determining a dynamic coordination control method corresponding to the starting and intervention of the engine according to the starting mode of the engine and the working state of the clutch. The invention can realize two control methods of serial hybrid engine starting and intervention dynamic coordination control and parallel hybrid engine starting and intervention dynamic coordination control according to the conditions of the actual state, mode, starting mode and the like of the whole vehicle, reduce the impact on the whole vehicle as much as possible in the starting and intervention process of the engine, and improve the running smoothness, NVH performance and driving comfort of a driver.
Description
Technical Field
The embodiment of the invention relates to the technical field of hybrid electric vehicles, in particular to a method and a device for dynamically and coordinately controlling an engine of a hybrid electric vehicle.
Background
The hybrid vehicle refers to a vehicle in which a vehicle driving system is combined by two or more power sources, and the running power of the vehicle is provided by a single or multiple power sources according to the actual running state of the vehicle.
Hybrid power systems existing in the current market already have functions of pure electric driving and hybrid mode driving related to hybrid power, but hybrid vehicles can generate large impact when the pure electric driving mode and an engine participate in switching between driving modes, and the comfort of drivers is seriously influenced. Many enterprises are working to solve the impact problem, and the coordinated control method for engine starting and intervention mode switching has become a great difficulty in the development of hybrid electric vehicles.
Disclosure of Invention
The invention provides a dynamic coordination control method and a dynamic coordination control device for an engine of a hybrid electric vehicle, which aim to reduce the impact on the whole vehicle as much as possible in the starting and intervening processes of the engine, and improve the driving smoothness, the Noise, Vibration and Harshness (NVH) performance of the vehicle and the driving comfort of a driver.
In a first aspect, a flowchart of a method for dynamically coordinating and controlling an engine of a hybrid electric vehicle according to an embodiment of the present invention is applied to a coaxial series-parallel hybrid electric vehicle, where the coaxial series-parallel hybrid electric vehicle includes: the engine, clutch 1, motor 1, clutch 2 and the motor 2 that connect gradually include:
s110, when the engine has a starting request, acquiring a starting mode of the engine;
and S120, determining a dynamic coordination control method corresponding to the starting and intervention of the engine according to the starting mode of the engine and the working state of the clutch.
Optionally, the starting mode of the engine in S110 includes starting with the motor 1, starting with the motor 2, and starting with the starter.
Optionally, the S120 includes:
when the starting mode of the engine is that the motor 1 is started, if the current clutch 2 is in a combined state, the parallel hybrid power motor 1 is subjected to dynamic coordination engine starting and intervention control;
if the clutch 2 is in the open state, the engagement control of the clutch 1 is executed, and if the clutch 1 is in the engaged state, the series hybrid motor 1 is dynamically coordinated with the engine start and the intervention control.
Optionally, the S120 includes:
when the starting mode of the engine is that the motor 2 is started, if the current clutch 2 is in a combined state, the parallel hybrid power motor 2 is used for dynamically coordinating the starting and the intervention control of the engine;
and if the current clutch 2 is in an open state, executing clutch 2 combination control, and if the clutch 2 is in a combination state, performing dynamic coordination engine starting and intervention control on the parallel hybrid power motor 2.
Optionally, the S120 includes:
when the starting mode of the engine is starter starting, the clutch 1 is opened, and when the clutch 1 is opened, the starter is used for starting the engine normally.
Optionally, in different engine starting and intervening controls, actual working states of the engine, the motor and the clutch are obtained;
and cooperatively controlling the engine, the motor and the clutch according to the actual working state.
Optionally, judging whether the engine fails to start and whether the engine is restarted at different starting stages according to the actual working state of the engine;
and carrying out self-adaptive real-time correction and adjustment on the starting torque of the engine or the target combination position of the clutch according to the starting times of the engine.
After the engine is started successfully, the judgment is carried out according to the serial or parallel request mode of the vehicle, and the engine, the motor and the clutch are cooperatively controlled.
In a second aspect, an embodiment of the present invention further provides a hybrid electric vehicle engine dynamic coordination control apparatus, configured in a coaxial series-parallel hybrid electric vehicle, where the coaxial series-parallel hybrid electric vehicle includes an engine, a clutch 1, a motor 1, a clutch 2, and a motor 2, which are connected in sequence, and includes:
the starting mode acquiring module is used for acquiring the starting mode of the engine when the engine has a starting request;
and the dynamic coordination control module is used for determining a dynamic coordination control method corresponding to the starting and intervention of the engine according to the starting mode of the engine and the working state of the clutch.
The invention has the beneficial effects that:
the technical scheme of the invention aims at a coaxial series-parallel hybrid electric vehicle, and provides a method for controlling the starting and intervention dynamic coordination of an engine of the coaxial series-parallel hybrid electric vehicle, which can realize two control methods of the starting and intervention dynamic coordination control of a series hybrid electric engine and the starting and intervention dynamic coordination control of a parallel hybrid electric engine according to the actual state, mode, starting mode and other conditions of the whole vehicle. In different engine starting and intervention controls, the engine, the motor, the clutch and other parts are cooperatively controlled, so that the impact on the whole vehicle is reduced as much as possible in the starting and intervention processes of the engine, and the running smoothness, NVH performance and driving comfort of a driver of the vehicle are improved. In addition, the actual working state of the engine is acquired in real time, the starting torque of the engine or the target combination position of the clutch is corrected and adjusted in real time in a self-adaptive mode, the influence of performance changes of the engine, the clutch and other parts on the starting of the engine is overcome, and the robustness of the success of the starting of the engine is improved.
Drawings
FIG. 1 is a flowchart illustrating a method for dynamically coordinating and controlling an engine of a hybrid electric vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a topology of a hybrid vehicle system according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating engine starting and intervening control mode selection provided by an embodiment of the present invention;
fig. 4 is a flowchart of a series dynamic coordination start and intervention control mode of the motor 1 according to the embodiment of the present invention;
fig. 5 is a flowchart of a parallel dynamic coordination starting and intervention control mode of the motor 1 according to the embodiment of the present invention;
fig. 6 is a flowchart of a parallel dynamic coordination start and intervention control mode of the electric machine 2 according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Examples
Fig. 1 is a flowchart of a hybrid electric vehicle engine dynamic coordination control according to an embodiment of the present invention, where the method is applied to a coaxial series-parallel hybrid electric vehicle. Referring further to fig. 2, the coaxial series-parallel hybrid vehicle includes: the engine, the clutch 1, the motor 1, the clutch 2 and the motor 2 are connected in sequence.
The method specifically comprises the following steps:
and S110, acquiring the starting mode of the engine when the engine has a starting request.
The starting modes of the engine comprise starting of the motor 1, starting of the motor 2 and starting of a starter.
And S120, determining a dynamic coordination control method corresponding to the starting and intervention of the engine according to the starting mode of the engine and the working state of the clutch.
Referring to fig. 3, when the starting mode of the engine is the starting of the motor 1, if the current clutch 2 is in the engaged state, the parallel hybrid power motor 1 dynamically coordinates the starting of the engine and performs the intervention control; if the clutch 2 is in the open state, the engagement control of the clutch 1 is executed, and if the clutch 1 is in the engaged state, the series hybrid motor 1 is dynamically coordinated with the engine start and the intervention control.
When the starting mode of the engine is that the motor 2 is started, if the current clutch 2 is in a combined state, the parallel hybrid power motor 2 is used for dynamically coordinating the starting and the intervention control of the engine; and if the current clutch 2 is in an open state, executing clutch 2 combination control, and if the clutch 2 is in a combination state, performing dynamic coordination engine starting and intervention control on the parallel hybrid power motor 2.
When the starting mode of the engine is starter starting, the clutch 1 is opened, and when the clutch 1 is opened, the starter is used for starting the engine normally.
In the selection of the engine starting and intervention control method, the present embodiment implements two control methods, namely, the series hybrid engine starting and intervention dynamic coordination control and the parallel hybrid engine starting and intervention dynamic coordination control, according to the actual state of the entire vehicle, the starting mode and other conditions.
Furthermore, in different engine starting and intervention controls, the engine, the motor and the clutch are cooperatively controlled according to the actual working states of the engine, the motor and the clutch, so that the impact on the whole vehicle is reduced as much as possible in the engine starting and intervention process, and the driving smoothness, the NVH performance and the driving comfort of a driver are improved.
In addition, the embodiment also judges whether the engine fails to start and whether the engine is restarted in different starting stages according to the actual working state of the engine; the self-adaptive real-time correction and adjustment are carried out on the starting torque of the engine or the target combination position of the clutch according to the starting times, so that the influence of the performance change of the components such as the engine, the clutch and the like on the starting of the engine is overcome, and the successful robustness of the starting of the engine is improved; after the engine is started successfully, the torque interaction of the engine and the motor, the closed-loop synchronization of the rotating speed, the combination or separation of the clutch and the like are controlled according to the request judgment of the serial or parallel mode of the vehicle, so that the smooth intervention of the engine is realized, and the smooth switching transition of the serial or parallel mode of the whole vehicle is further realized.
Referring specifically to fig. 4, when the series hybrid electric machine 1 is selected to dynamically coordinate engine starting and intervening control modes:
1) firstly, entering an engine stop state, and entering a first stage of engine starting when an engine starting request is detected;
2) when the engine is in a first stage of starting: first, the first-stage motor 1 drag-down engine starting torque is determined according to the starting time and the actual engine speed. Due to the fact that different engines and motors have different performances, the data are tested through actual tests to obtain an optimal value; if the actual engine starting time is larger than the maximum starting time of the first stage, the starting time is reset, the starting times of the first stage are added by one, a first-stage torque correction factor of the motor 1 is obtained by looking up a table according to the starting times of the first stage, the starting torque of the motor 1 for dragging the motor 1 is determined according to the starting time and the actual rotating speed of the engine and multiplied by the first-stage torque correction factor, and finally the first-stage starting required torque of the motor 1 is obtained; if the starting times of the first stage of the engine are larger than the maximum starting times of the first stage, the engine is in a failed starting state, and the engine is stopped to start.
3) When the engine speed is detected to be greater than the engine first-stage starting ending speed, enabling the engine to inject oil and ignite, and entering the second stage of engine starting.
4) When the engine is in a second phase of cranking: firstly, determining the starting torque of the motor 1 dragging the engine in the second stage according to the starting time and the actual rotating speed of the engine, and obtaining an optimal value through actual test of the data; if the engine is not started successfully within the maximum starting time of the second stage, the starting frequency of the second stage is increased by one, and the engine enters an engine restarting state; if the starting times of the engine in the second stage exceed the maximum starting times, the engine is in a failed starting state, and the engine is stopped to start.
5) When the engine is started in the second stage, the successful engine starting mark is detected, and the successful engine starting and the transmission system intervening state are entered.
6) When the engine is in a starting success and intervening transmission system state: firstly, a vehicle system working mode is selected according to a vehicle mode judgment selection module;
when the vehicle system mode selects the series mode: the engine does not need to intervene in a vehicle transmission system, so that the starting and intervention of the engine are finished, and a series hybrid power working mode is entered;
when the vehicle system mode selects the parallel mode: firstly, carrying out closed-loop synchronous control on the rotating speed of the engine to synchronize the actual rotating speed of the engine with the rotating speed of the motor 2; when the actual rotating speed of the engine and the rotating speed of the motor 2 are close and stable for a certain time, the engine and the motor are in a synchronous state, then the clutch 2 is controlled to be combined by adopting a first-speed and second-speed control method, namely when the clutch 2 is positioned between a completely separated point and a half-combined point, the clutch 2 is combined at a higher speed, so that the intervention time of the engine is shortened, and when the combination degree of the clutch 2 is close to the half-combined point, the combination speed of the clutch is controlled to be reduced, so that the NVH problem of a vehicle caused by the intervention of the engine in a transmission system is reduced as much as possible, and the driving comfort is improved. According to the combination pressure of the clutch 2, the torque transmitted by the engine through the clutch 2 is obtained by table lookup, and the transmission torque of the clutch 2 corresponding to different clutch combination pressures is obtained through test tests; in the dynamic combination process of the clutch 2, subtracting the torque transmitted in the dynamic combination process of the clutch 2 from the torque of the driving vehicle distributed by the motor 2 to obtain the torque required by the motor 2; and when the clutch 2 is completely closed, the parallel hybrid power working mode is started, and then torque interaction is carried out on the torque required by the engine and the motor according to the torque required by the engine and the motor calculated by the energy management module.
7) When the engine is detected to be flameout due to some factors, the engine is restarted, and after the engine is completely stopped, whether the engine is required to be restarted and the vehicle is involved in driving is determined according to whether the engine is required to be involved in working.
With continued reference to fig. 5, when the parallel hybrid electric machine 1 is selected to dynamically coordinate engine starting and intervening control modes:
1) firstly, entering an engine stop state, and entering a first stage of engine starting when an engine starting request is detected;
2) when the engine is in a first stage of starting: the clutch 1 is combined and the torque compensation control of the motor 1 is carried out at the stage, the clutch 1 is combined by adopting a first-speed and second-speed control method, namely when the clutch 1 is positioned between a completely separated point and a half-combined point, the clutch 1 is combined at a higher speed, so that the starting time of an engine is shortened, when the combination degree of the clutch 1 is close to the half-combined point, the combination speed of the clutch is controlled to be reduced, so that the clutch 1 is positioned at the half-combined point state, the engine is driven to start, the NVH problem of a vehicle caused by starting of the engine and intervening in a transmission system is reduced as much as possible, the driving comfort is improved, the torque transmitted by the motor 1 through the clutch 1 is obtained by table lookup according to the combination pressure of the clutch 1 and is used as the compensation torque of the motor 1, and the transmission torque corresponding to the combination pressure of the different clutches is obtained through test; adding the driving torque distributed by the motor 1 to the dynamic compensation torque of the motor 1 generated in the process of combining the clutch 1 to finally obtain the torque required by the motor 1;
if the first-stage starting time exceeds the first-stage maximum starting time, resetting the first-stage starting time and adding one to the first-stage starting times, if the first-stage starting times do not exceed the first-stage maximum starting times at the moment, carrying out an engine restarting state, separating the clutch 1, and after the clutch 1 is separated and the engine is completely stopped, if an engine starting request still exists at the moment, re-entering the first stage of starting the engine; in addition, the position of the half-joint point of the clutch 1 is corrected and compensated by adopting the starting times of the first stage, the corrected value is stored in the controller, and the position of the half-joint point is changed due to self-adaptive overcoming of the friction of the clutch, so that the robustness of the next successful starting of the engine is improved; if the starting times of the first stage exceed the maximum starting times of the first stage, the starting failure state is entered, and the engine is stopped to start.
3) When the actual rotating speed of the engine is detected to be greater than the first-stage starting ending rotating speed of the engine, the second stage of starting the engine is started, the clutch 1 is separated, the torque of the motor 1 is reduced, and the engine enables oil injection and ignition.
4) When the engine is in a second phase of cranking: firstly, a method of firstly slowing and then speeding is adopted to control the clutch 1 to be completely separated, namely when the clutch 1 is in a separation starting stage, the clutch 1 is separated at a slower speed, so that the problem of vehicle impact caused by sudden load change is solved, and when the clutch 1 is in a separation state, the clutch separation speed is controlled to be accelerated, so that the clutch 1 is rapidly separated to be in a completely separated state; in the process of separating the clutch 1, looking up a table to obtain the torque transmitted by the motor 1 through the clutch 1 as the compensation torque of the motor 1 according to the combination pressure of the clutch 1 in real time, wherein the different clutch combination pressures are obtained through test tests corresponding to the transmission torque of the clutch 1; the driving torque distributed by the motor 1 is added with the dynamic compensation torque of the motor 1 generated in the process of combining the clutch 1, and the torque required by the motor 1 is finally obtained, so that the influence on the drivability caused by sudden change of the vehicle load due to the separation of the clutch 1 is avoided; when the clutch 1 is separated, the engine enables oil injection ignition, so that torque fluctuation caused in the oil injection ignition process of the engine is prevented from being transmitted to a vehicle transmission system, and the driving comfort of the vehicle is improved.
5) When the engine is started in the second stage, when the engine starting success mark is detected, the engine starting success and the transmission system intervening state are entered; when the engine starting failure is detected, adding one to the number of times of starting the engine; if the number of times of starting the engine does not exceed the maximum number of times of starting, the engine is in a restarting state, the clutch 1 is separated, and after the engine is completely stopped, if the engine starting request still exists at the moment, the first stage of starting the engine is restarted; if the starting times exceed the maximum starting times, the starting failure state is entered, and the engine is stopped to start.
6) When the engine is in a starting success and intervening transmission system state: firstly, a vehicle system working mode is selected according to a vehicle mode judgment selection module;
when the vehicle system mode selects the series mode: the engine does not need to intervene in a vehicle transmission system, firstly, torque interaction between the motor 1 and the motor 2 is carried out, and after the torque of the motor 1 is completely transferred to the motor 2, the torque interaction is completed; after the torque interaction is finished, the clutch 2 is further controlled to be separated; after the clutch 2 is separated, carrying out closed-loop control on the rotating speed of the motor 1, and after the rotating speed of the motor 1 is synchronous with that of the engine, controlling the clutch 1 to be combined; after the clutch 1 is combined, the serial hybrid power working mode is started;
when the vehicle system mode selects the parallel mode: firstly, carrying out closed-loop synchronous control on the rotating speed of the engine to synchronize the actual rotating speed of the engine with the rotating speed of the motor 1; when the actual rotating speed of the engine and the rotating speed of the motor 1 are close and stable for a certain time, the two are in a synchronous state, then the clutch 1 is controlled to be combined by adopting a first-speed and second-speed control method, namely when the clutch 1 is positioned between a completely separated point and a half-combined point, the clutch 1 is combined at a higher speed, so that the intervention time of the engine is shortened, and when the combination degree of the clutch 1 is close to the half-combined point, the combination speed of the clutch is controlled to be reduced, so that the NVH problem of a vehicle caused by the intervention of the engine in a transmission system is reduced as much as possible, the driving comfort is improved, the torque transmitted by the engine through the clutch 1 is obtained by table lookup according to the combination pressure of the clutch 1, and the transmission torque of the engine corresponding to the combination pressure of the different clutches is obtained by test; in the dynamic combination process of the clutch 1, subtracting the torque transmitted in the dynamic combination process of the clutch 1 from the torque of the driving vehicle distributed by the motor 1 to obtain the torque required by the motor 1; and when the clutch 1 is completely closed, the parallel hybrid power working mode is started, and then torque interaction is carried out on the torque required by the engine and the motor according to the torque required by the engine and the motor calculated by the energy management module.
7) When the engine is detected to be flameout due to some factors, the engine is restarted, the clutch 1 is separated, and after the engine is completely stopped, whether the engine is required to be restarted and the vehicle is driven is determined according to whether the engine has a starting request.
With further reference to fig. 6, when the parallel hybrid electric machine 2 is selected to dynamically coordinate engine starting and intervening control modes:
1) firstly, entering an engine stop state, and entering a first stage of engine starting when an engine starting request is detected;
2) when the engine is in a first stage of starting: clutch combination and motor 2 torque compensation control are carried out at the stage, the clutch 1 combination is controlled by adopting a first-speed-last-slow control method, namely when the clutch 1 is between a completely separated point and a half-combination point, the clutch 1 combination is carried out at a higher speed, so that the engine starting time is shortened, when the combination degree of the clutch 1 is close to the half-combination point, the clutch combination speed is controlled to be reduced, so that the clutch 1 is in a half-combination point state, the engine is driven to start, so that the NVH problem of a vehicle caused by starting of the engine and intervening in a transmission system is reduced as much as possible, the driving comfort is improved, the torque transmitted by the motor 2 through the clutch 1 is obtained by table lookup according to the combination pressure of the clutch 1 and is used as the motor 2 compensation torque, and the transmission torque corresponding to the clutch 1 is obtained by test according to the combination pressure of the clutch; adding the driving torque distributed by the motor 2 to the dynamic compensation torque of the motor 2 generated in the combining process of the clutch 1 to finally obtain the torque required by the motor 2; if the first-stage starting time exceeds the first-stage maximum starting time, resetting the first-stage starting time and adding one to the first-stage starting times, if the first-stage starting times do not exceed the first-stage maximum starting times at the moment, carrying out an engine restarting state, separating the clutch 1, and after the clutch 1 is separated and the engine is completely stopped, if an engine starting request still exists at the moment, re-entering the first stage of starting the engine; in addition, the position of the half-joint point of the clutch 1 is corrected and compensated by adopting the starting times of the first stage, the corrected value is stored in the controller, and the position of the half-joint point is changed due to self-adaptive overcoming of the friction of the clutch, so that the robustness of the next successful starting of the engine is improved; if the starting times of the first stage exceed the maximum starting times of the first stage, the starting failure state is entered, and the engine is stopped to start.
3) When the actual rotating speed of the engine is detected to be larger than the starting ending rotating speed of the engine in the first stage, the engine enters the second stage of starting the engine, the clutch 1 is separated, the torque of the motor 2 is reduced, and the engine enables oil injection and ignition.
4) When the engine is in a second phase of cranking: firstly, a method of firstly slowing and then speeding is adopted to control the clutch 1 to be completely separated, namely when the clutch 1 is in a separation starting stage, the clutch 1 is separated at a slower speed, so that the problem of vehicle impact caused by sudden load change is solved, and when the clutch 1 is in a separation state, the clutch separation speed is controlled to be accelerated, so that the clutch 1 is rapidly separated to be in a completely separated state; in the process of separating the clutch 1, looking up a table to obtain the torque transmitted by the motor 2 through the clutch 1 as the compensation torque of the motor 2 according to the combination pressure of the clutch 1 in real time, wherein the different clutch combination pressures are obtained through test tests corresponding to the transmission torque of the clutch 1; the driving torque distributed by the motor 2 is added with the dynamic compensation torque of the motor 2 generated in the process of combining the clutch 1, and the torque required by the motor 2 is finally obtained, so that the influence on the drivability caused by sudden change of the vehicle load due to the separation of the clutch 1 is avoided; when the clutch 1 is separated, the engine enables oil injection ignition, so that torque fluctuation caused in the oil injection ignition process of the engine is prevented from being transmitted to a vehicle transmission system, and the driving comfort of the vehicle is improved.
5) When the engine is started in the second stage, when the engine starting success mark is detected, the engine starting success and the transmission system intervening state are entered; when the engine starting failure is detected, adding one to the number of times of starting the engine; if the number of times of starting the engine does not exceed the maximum number of times of starting, the engine is in a restarting state, the clutch 1 is separated, and after the engine is completely stopped, if the engine starting request still exists at the moment, the first stage of starting the engine is restarted; if the starting times exceed the maximum starting times, the starting failure state is entered, and the engine is stopped to start.
6) When the engine is in a starting success and intervening transmission system state: firstly, a vehicle system working mode is selected according to a vehicle mode judgment selection module;
when the vehicle system mode selects the series mode: the engine does not need to intervene in a vehicle transmission system, firstly, torque interaction between the motor 1 and the motor 2 is carried out, and after the torque of the motor 1 is completely transferred to the motor 2, the torque interaction is completed; after the torque interaction is finished, the clutch 2 is further controlled to be separated; after the clutch 2 is separated, carrying out closed-loop control on the rotating speed of the motor 1, and after the rotating speed of the motor 1 is synchronous with that of the engine, controlling the clutch 1 to be combined; after the clutch 1 is combined, the serial hybrid power working mode is started;
when the vehicle system mode selects the parallel mode: firstly, carrying out closed-loop synchronous control on the rotating speed of the engine to synchronize the actual rotating speed of the engine with the rotating speed of the motor 1; when the actual rotating speed of the engine and the rotating speed of the motor 1 are close and stable for a certain time, the two are in a synchronous state, then the clutch 1 is controlled to be combined by adopting a first-speed and second-speed control method, namely when the clutch 1 is positioned between a completely separated point and a half-combined point, the clutch 1 is combined at a higher speed, so that the intervention time of the engine is shortened, and when the combination degree of the clutch 1 is close to the half-combined point, the combination speed of the clutch is controlled to be reduced, so that the NVH problem of a vehicle caused by the intervention of the engine in a transmission system is reduced as much as possible, the driving comfort is improved, the torque transmitted by the engine through the clutch 1 is obtained by table lookup according to the combination pressure of the clutch 1, and the transmission torque of the engine corresponding to the combination pressure of the different clutches is obtained by test; in the dynamic combination process of the clutch 1, subtracting the torque transmitted in the dynamic combination process of the clutch 1 from the torque of the driving vehicle distributed by the motor 2 to obtain the torque required by the motor 2; and when the clutch 1 is completely closed, the parallel hybrid power working mode is started, and then torque interaction is carried out on the torque required by the engine and the motor according to the torque required by the engine and the motor calculated by the energy management module.
7) When the engine is detected to be flameout due to some factors, the engine is restarted, the clutch 1 is separated, and after the engine is completely stopped, whether the engine is required to be restarted and the vehicle is driven is determined according to whether the engine has a starting request.
The technical scheme of the embodiment of the invention can realize two control methods of serial hybrid engine starting and intervention dynamic coordination control and parallel hybrid engine starting and intervention dynamic coordination control according to the conditions of the actual state, the starting mode and the like of the whole vehicle. In different engine starting and intervention controls, the engine, the motor, the clutch and other parts are cooperatively controlled, so that the impact on the whole vehicle is reduced as much as possible in the starting and intervention processes of the engine, and the running smoothness of the vehicle and the driving comfort of a driver are improved. In addition, the actual working state of the engine is collected in real time, whether the engine fails to start and whether the engine is restarted are judged in different starting stages, and self-adaptive real-time correction and adjustment are carried out on the starting torque of the engine or the target combination position of the clutch according to the starting times, so that the influence of performance changes of the engine, the clutch and other parts on the starting of the engine is overcome, and the successful robustness of the starting of the engine is improved.
The embodiment of the invention also provides a hybrid electric vehicle engine dynamic coordination control device, which is configured in a coaxial series-parallel hybrid electric vehicle, wherein the coaxial series-parallel hybrid electric vehicle comprises an engine, a clutch 1, a motor 1, a clutch 2 and a motor 2 which are sequentially connected, and the device comprises:
the starting mode acquiring module is used for acquiring the starting mode of the engine when the engine has a starting request.
The starting modes of the engine comprise starting of the motor 1, starting of the motor 2 and starting of a starter.
And the dynamic coordination control module is used for determining a dynamic coordination control method of the engine according to the starting mode of the engine and the working state of the clutch.
Optionally, the dynamic coordination control mode is specifically configured to: when the starting mode of the engine is that the motor 1 is started, if the current clutch 2 is in a combined state, the parallel hybrid power motor 1 is subjected to dynamic coordination engine starting and intervention control;
if the clutch 2 is in the open state, the engagement control of the clutch 1 is executed, and if the clutch 1 is in the engaged state, the series hybrid motor 1 is dynamically coordinated with the engine start and the intervention control.
Optionally, the dynamic coordination control mode is further specifically configured to:
when the starting mode of the engine is that the motor 2 is started, if the current clutch 2 is in a combined state, the parallel hybrid power motor 2 is used for dynamically coordinating the starting and the intervention control of the engine;
and if the current clutch 2 is in an open state, executing clutch 2 combination control, and if the clutch 2 is in a combination state, performing dynamic coordination engine starting and intervention control on the parallel hybrid power motor 2.
Optionally, the dynamic coordination control mode is further specifically configured to:
when the starting mode of the engine is starter starting, the clutch 1 is opened, and when the clutch 1 is opened, the starter is used for starting the engine normally.
On the basis of the above embodiment, the dynamic coordination control mode is further configured to: acquiring actual working states of an engine, a motor and a clutch in different engine starting and intervening controls;
and cooperatively controlling the engine, the motor and the clutch according to the actual working state.
Judging whether the engine fails to start and whether the engine is restarted at different starting stages according to the actual working state of the engine;
carrying out self-adaptive real-time correction and adjustment on the starting torque of the engine or the target combination position of the clutch according to the starting times of the engine;
after the engine is started successfully, the judgment is carried out according to the serial or parallel request mode of the vehicle, and the engine, the motor and the clutch are cooperatively controlled.
The hybrid electric vehicle engine dynamic coordination control device provided by the embodiment of the invention can execute the hybrid electric vehicle engine dynamic coordination control method provided by any embodiment of the invention, has corresponding functional modules and beneficial effects of the execution method, and is not repeated.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A dynamic coordination control method for an engine of a hybrid electric vehicle is applied to a coaxial series-parallel hybrid electric vehicle, and the coaxial series-parallel hybrid electric vehicle comprises the following steps: the engine, clutch 1, motor 1, clutch 2 and the motor 2 that connect gradually, its characterized in that includes:
s110, when the engine has a starting request, acquiring a starting mode of the engine;
and S120, determining a dynamic coordination control method corresponding to the starting and intervention of the engine according to the starting mode of the engine and the working state of the clutch.
2. The method according to claim 1, wherein the starting manner of the engine in S110 includes motor 1 start, motor 2 start, and starter start.
3. The method according to claim 2, wherein the S120 comprises:
when the starting mode of the engine is that the motor 1 is started, if the current clutch 2 is in a combined state, the parallel hybrid power motor 1 is subjected to dynamic coordination engine starting and intervention control;
if the clutch 2 is in the open state, the engagement control of the clutch 1 is executed, and if the clutch 1 is in the engaged state, the series hybrid motor 1 is dynamically coordinated with the engine start and the intervention control.
4. The method according to claim 2, wherein the S120 comprises:
when the starting mode of the engine is that the motor 2 is started, if the current clutch 2 is in a combined state, the parallel hybrid power motor 2 is used for dynamically coordinating the starting and the intervention control of the engine;
and if the current clutch 2 is in an open state, executing clutch 2 combination control, and if the clutch 2 is in a combination state, performing dynamic coordination engine starting and intervention control on the parallel hybrid power motor 2.
5. The method according to claim 2, wherein the S120 comprises:
when the starting mode of the engine is starter starting, the clutch 1 is opened, and when the clutch 1 is opened, the starter is used for starting the engine normally.
6. The method according to any one of claims 3-4, wherein:
acquiring actual working states of an engine, a motor and a clutch in different engine starting and intervening controls;
and cooperatively controlling the engine, the motor and the clutch according to the actual working state.
7. The method of claim 6, wherein:
judging whether the engine fails to start and whether the engine is restarted at different starting stages according to the actual working state of the engine;
carrying out self-adaptive real-time correction and adjustment on the starting torque of the engine or the target combination position of the clutch according to the starting times of the engine;
after the engine is started successfully, the judgment is carried out according to the serial or parallel request mode of the vehicle, and the engine, the motor and the clutch are cooperatively controlled.
8. The utility model provides a hybrid vehicle engine developments coordinated control device, disposes in coaxial series-parallel connection formula hybrid vehicle, coaxial series-parallel connection formula hybrid vehicle is including the engine, clutch 1, motor 1, clutch 2 and the motor 2 that connect gradually, its characterized in that includes:
the starting mode acquiring module is used for acquiring the starting mode of the engine when the engine has a starting request;
and the dynamic coordination control module is used for determining a dynamic coordination control method corresponding to the starting and intervention of the engine according to the starting mode of the engine and the working state of the clutch.
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