CN112977391A - Control method of range extender system - Google Patents
Control method of range extender system Download PDFInfo
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- CN112977391A CN112977391A CN202110243144.XA CN202110243144A CN112977391A CN 112977391 A CN112977391 A CN 112977391A CN 202110243144 A CN202110243144 A CN 202110243144A CN 112977391 A CN112977391 A CN 112977391A
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- range extender
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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
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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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
- B60W10/30—Conjoint control of vehicle sub-units of different type or different function including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
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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
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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
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
Abstract
The invention provides a control method of a range extender system, which can optimize the starting mode of the range extender system. The control method reduces the impact load of the transmission mechanism in the starting process of the motor by reducing the continuous starting torque; on the other hand, the angular acceleration when the rotating speed of the range extender reaches the generator starting target rotating speed n1 and the engine target rotating speed n2 is reduced, and the speed difference between the generator starting target rotating speed n1 and the engine target rotating speed n2 is reduced, so that the uprush rotating speed of the engine after the engine reaches the target rotating speed is reduced, and the purpose of smooth starting is achieved.
Description
Technical Field
The invention relates to the technical field of range-extending electric automobiles, in particular to a control method of a range extender system.
Background
The range extender system is in constant-power operation and low oil consumption in an ideal state of vehicle application and meets the power required by the vehicle, multiple working condition points, power following and the like are extended in order to balance the power economy requirement of the vehicle in the actual application process, and the starting and stopping modes of the range extender are particularly important in the process of strategy formulation.
Firstly, in the prior art, the starting mode adopted by the range extender system is mainly a mode of starting the engine by dragging the engine with a motor at a high speed to improve the emission problem of the range extender system. However, the difficulty of achieving the target rotation speed and performing steady-state control of the range extender is increased due to the high-speed starting mode, particularly when the motor drives the engine to the calibrated rotation speed and the rotation speed of the engine rapidly rises after ignition, the starting time is shortened, the impact load on a transmission mechanism is too large, the phenomenon of overshoot of the rotation speed is easy to occur, and the abrasion of a cylinder is aggravated, so that the starting smoothness of the range extender needs to be improved.
And secondly, in the current-stage shutdown control process of the range extender system, the rotating speed of the range extender is rapidly reduced to 0 rotating speed by means of engine oil cut-off and motor braking. The problems of the fluctuation of the rotating speed of the stop tail section of the range extender and the abnormal torsional vibration of the transmission mechanism easily occur in the control mode, and the problem of frequent starting and stopping of the range extender can occur in the application process of the whole automobile due to the stop control mode, so that the oil consumption of the whole automobile is increased.
Disclosure of Invention
The invention aims to provide a control method of a range extender system, which can optimize the starting mode of the range extender system.
According to the control method of the range extender system provided by the invention, the control method is applied to a range extender electric vehicle, the range extender electric vehicle comprises a vehicle control unit, a range extender controller, a generator controller connected with a generator and an engine controller connected with an engine, the range extender controller is respectively in communication connection with the vehicle control unit, the generator controller and the engine controller, and the control method comprises the step of starting the range extender:
s, the vehicle controller sends a power request to the range extender controller after detecting that the starting condition of the vehicle is met;
s, monitoring the temperature of the cooling liquid fed back by the engine controller by the range extender controller, and inquiring a corresponding relation table between the temperature of the cooling liquid in a control program of the range extender controller and a target rotating speed;
s, the range extender controller sends an initial starting torque to the generator controller according to the current corresponding cooling liquid temperature;
s, continuously monitoring the rotating speed of the motor by the generator controller, and feeding back the rotating speed to the range extender controller, wherein the range extender controller requests the generator controller to reduce the corresponding starting torque of the motor according to the starting target rotating speed n1 of the generator and the average starting resistance moment at the corresponding cooling liquid temperature, so that the angular acceleration when the rotating speed of the generator reaches n1 is reduced to the requirement of an angular acceleration preset threshold a;
(S) after t1 seconds from the step (S), (S) when the range extender controller detects that the rotating speed of the range extender reaches the starting target rotating speed n1 of the generator, requesting the generator controller to enter a 0-torque mode;
s, the range extender controller sends an ignition instruction and an engine target rotating speed n2 to the engine controller;
s, after the engine controller sends an ignition instruction for t2 seconds, the range extender starts steady-state regulation of the idle speed after the engine controller controls the engine speed to reach the target engine speed n 2;
and S eighthly, finishing starting, and judging that the range extender enters a heat engine state or a power generation working condition by the vehicle control unit according to the temperature T of the cooling liquid.
According to the starting step of the control method of the range extender system, on one hand, the impact load of a transmission mechanism in the starting process of the motor is reduced by reducing the continuous starting torque; on the other hand, the engine starting device reduces the overshoot rotation speed after the engine reaches the target rotation speed by reducing the angular acceleration when the range extender rotation speed reaches the generator starting target rotation speed n1 (namely the engine ignition rotation speed) and the engine target rotation speed n2 and reducing the speed difference between the generator starting target rotation speed n1 and the engine target rotation speed n2, thereby achieving the purpose of smooth starting.
Further, the control method further comprises the step of stopping the range extender:
when the vehicle control unit detects that the shutdown condition is met, the accelerator voltage signal sent by the range extender controller to the engine controller is 0, and the transmission of the rotating speed signal request is stopped;
t, the generator controller maintains a power generation mode and adjusts a torque reduction gradient according to the current running state of the range extender, so that the rotating speed of the range extender quickly reaches an idle target rotating speed n 0;
the range extender controller requests the generator controller to enter a 0-torque mode and requests the engine controller to carry out idle speed control;
t, the range extender controller requests the engine controller to enter an idle mode and maintains the idle accumulated idle time T3 seconds;
t, when the engine controller enters an idle mode and the accumulated idle time is less than T3 seconds, the range extender receives a new power demand instruction, and when the starting condition is met, the range extender enters the power generation working condition again;
t, when the engine controller enters an idle mode and the accumulated idle time is more than T3 seconds, the range extender is shut down;
and T, the range extender loses the rotating speed signal and stops the machine.
The stopping step of the control method of the range extender system avoids the speed uprush caused by the stopping and oil cutting of high-power operation and achieves the aims of quickly reducing the speed of the range extender and recovering the stored kinetic energy of the flywheel by adjusting the amplitude of the generating torque through the braking generating characteristic of the positive and negative torque of the permanent magnet synchronous generator; on the other hand, the idle waiting time is set in the stopping process, and the vehicle controller immediately enters a power generation mode when receiving a power request of the vehicle controller in the waiting process, so that the frequency of frequent starting and stopping of the range extender is reduced, the process that the range extender directly reduces from a high rotating speed to 0 rotating speed is avoided, the impact load in the stopping process is reduced, and the abnormal sound problem of a transmission mechanism at the tail stage of stopping is avoided.
Further, the correspondence table of the cooling liquid temperature and the target rotating speed is obtained through test mapping and written into a control program of the range extender controller.
Furthermore, in the starting process of the range extender, after the torque instruction is sent out, the range extender controller judges that the starting is failed after the lost time of the rotating speed signal exceeds the preset time.
Further, the vehicle control unit accumulates the starting failure times and limits the starting interval time of each time, and the abnormal starting of the range extender is fed back after the accumulated starting failure times reach a preset value.
Further, the interval time of each starting of the range extender is larger than a preset value.
Further, the range extender controller controls the working mode of the generator controller and distributes a torque instruction to the generator controller according to a power request sent by the vehicle control unit, and controls the accelerator opening of the engine controller and distributes a rotating speed instruction to the engine controller.
The control method of the range extender system has the following beneficial effects:
1. the starting initial torque and the starting target rotating speed of the range extender at different temperatures are set according to the starting resistance curve of the range extender, and the rotating speed overshoot of the rotating speed reaching the target rotating speed is avoided by controlling the angular acceleration of the starting rotating speed;
2. according to the invention, the difference value of the ignition rotating speed of the engine to the target rotating speed at each temperature is reduced, and the uprush acceleration of the rotating speed of the engine is reduced;
3. the invention recovers the energy in the shutdown process by maintaining the power generation mode of the motor in the shutdown process;
4. according to the invention, the idle speed maintaining time is set in the stopping process, so that the inertia moment of the transmission system is reduced, the problem of abnormal impact sound of the range extender on the transmission mechanism at the tail stage of stopping is solved, and the starting and stopping times of the range extender in the whole vehicle application process are reduced.
Drawings
Fig. 1 is a flowchart illustrating the starting steps of the control method of the range extender system according to the present invention.
Fig. 2 is a flowchart of the shutdown steps of the control method of the range extender system of the present invention.
Fig. 3 is a control architecture diagram of the range extender system of the present invention.
Fig. 4 is a schematic diagram of the range extender starting process of the present invention.
Fig. 5 is a schematic diagram of the range extender shutdown process of the present invention.
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
As shown in fig. 3, the range extender system of the present invention is composed of a vehicle control unit VCU, a range extender controller ACM, a generator controller GCU connected to a generator, and an engine controller ECU connected to an engine, wherein the range extender system has the following functional principles: the VCU of the vehicle controller detects a driver and a vehicle demand instruction, and distributes a power request to the ACM; the range extender controller ACM controls the working mode of the generator controller GCU and distributes a torque instruction to the generator controller GCU according to a power request sent by the vehicle control unit VCU, and controls the accelerator opening of the generator controller ECU and distributes a rotating speed instruction to the vehicle control unit ECU; the engine controller ECU controls the opening of an engine throttle valve and the fuel injection quantity of a fuel guide rail according to an accelerator signal and a rotating speed instruction of the range extender controller ACM; the generator controller GCU controls the generator torque according to the mode and torque command of the range extender controller ACM.
As shown in fig. 1 to 5, the control method of the range extender system of the present invention is applied to a range-extended electric vehicle, the range-extended electric vehicle includes a vehicle control unit VCU, a range extender controller ACM, a generator controller GCU connected to a generator, and an engine controller ECU connected to an engine, the range extender controller ACM is respectively connected to the vehicle control unit VCU, the generator controller GCU, and the engine controller ECU in a communication manner, the control method includes a range extender starting step, as shown in fig. 1:
s, a vehicle control unit VCU sends a power request to a range extender controller ACM after detecting that a vehicle starting condition is met;
s, monitoring the coolant temperature fed back by the ECU of the engine controller by the range extender controller ACM, and inquiring a corresponding relation table between the coolant temperature and a target rotating speed in a control program of the range extender controller ACM;
s, the range extender controller ACM sends an initial starting torque to the generator controller GCU according to the current corresponding coolant temperature;
s fourthly, the generator controller GCU continuously monitors the rotating speed of the motor and feeds the rotating speed back to the range extender controller ACM, and the range extender controller ACM requests the generator controller GCU to reduce the corresponding starting torque of the motor according to the starting target rotating speed n1 of the generator and the average starting resistance moment corresponding to the temperature of the cooling liquid, so that the angular acceleration when the rotating speed of the generator reaches n1 is reduced to the requirement of the angular acceleration preset threshold value a;
(S) after t1 seconds from the step (S), (S) when the range extender controller ACM detects that the rotating speed of the range extender reaches the starting target rotating speed n1 of the generator, the generator controller GCU is requested to enter a 0-torque mode;
s, the range extender controller ACM sends an ignition instruction and an engine target rotating speed n2 to the engine controller ECU; s, after the engine controller ECU sends an ignition instruction for t2 seconds, the range extender starts steady-state regulation of the idle speed after the engine controller ECU controls the engine speed to reach the target engine speed n 2;
and S8, finishing starting, and judging that the range extender enters a heat engine state or enters a power generation working condition by the VCU of the vehicle control unit according to the temperature T of the cooling liquid.
In the starting process of the range extender, after a torque instruction is sent out by the range extender controller, the starting failure is judged when the loss time of the rotating speed signal exceeds 0.8 s;
the VCU of the vehicle control unit accumulates the starting failure times and limits the starting interval time of each time, and the abnormal starting of the range extender is fed back after the accumulated starting failure times reach 3 times; the interval time of each starting of the range extender is not less than 6S.
And the cooling liquid temperature and target rotating speed corresponding relation table is obtained through test mapping and is written into a control program of the range extender controller ACM.
In practical application, taking a certain type of range extender of a four-cylinder gasoline engine as an example, the range extender is shown in the following table 1 and fig. 4:
TABLE 1
1. When the temperature of the cooling liquid is 20 ℃, a generator of the range extender starts the range extender with a starting torque of 60N.m, and then the torque is continuously reduced to 0 according to the angular acceleration;
2. after t1 seconds, the rotating speed of the range extender reaches the starting target rotating speed of the generator of 800rpm, the engine is ignited and the rotating speed is controlled to continuously rise and reaches the target rotating speed of the engine of 1100rpm after t2 seconds;
3. and when the rotating speed reaches the target idling speed, the ECU controls the idling steady state regulation to finish the starting.
The control method of the range extender of the invention further comprises the step of stopping the range extender, as shown in fig. 2:
when the vehicle control unit detects that the shutdown condition is met, the accelerator voltage signal sent by the range extender controller to the engine controller is 0, and the transmission of the rotating speed signal request is stopped;
t, the generator controller maintains a power generation mode and adjusts a torque reduction gradient according to the current running state of the range extender, so that the rotating speed of the range extender quickly reaches an idle target rotating speed n 0;
the range extender controller requests the generator controller to enter a 0-torque mode and requests the engine controller to carry out idle speed control;
t, the range extender controller requests the engine controller to enter an idle mode and maintains the idle accumulated idle time T3 seconds;
t, when the engine controller enters an idle mode and the accumulated idle time is less than T3 seconds, the range extender receives a new power demand instruction, and when the starting condition is met, the range extender enters the power generation working condition again;
t, when the engine controller enters an idle mode and the accumulated idle time is more than T3 seconds, the range extender is shut down;
and T, the range extender loses the rotating speed signal and stops the machine.
Wherein n0 < n1 < n 2; n1-n0 > n2-n1 t1 < t2 < t 3.
The schematic diagram of the shutdown process of the range extender is shown in fig. 5.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description, as long as the invention is capable of being practiced without modification in any way whatsoever, and is capable of other applications without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A control method of a range extender system is characterized in that the control method is applied to a range extender electric vehicle, the range extender electric vehicle comprises a vehicle control unit, a range extender controller, a generator controller connected with a generator and an engine controller connected with an engine, the range extender controller is respectively in communication connection with the vehicle control unit, the generator controller and the engine controller, and the control method comprises the step of starting the range extender:
s, the vehicle controller sends a power request to the range extender controller after detecting that the starting condition of the vehicle is met;
s, monitoring the temperature of the cooling liquid fed back by the engine controller by the range extender controller, and inquiring a corresponding relation table between the temperature of the cooling liquid in a control program of the range extender controller and a target rotating speed;
s, the range extender controller sends an initial starting torque to the generator controller according to the current corresponding cooling liquid temperature;
s, continuously monitoring the rotating speed of the motor by the generator controller, and feeding back the rotating speed to the range extender controller, wherein the range extender controller requests the generator controller to reduce the corresponding starting torque of the motor according to the starting target rotating speed n1 of the generator and the average starting resistance moment at the corresponding cooling liquid temperature, so that the angular acceleration when the rotating speed of the generator reaches n1 is reduced to the requirement of an angular acceleration preset threshold a;
(S) after t1 seconds from the step (S), (S) when the range extender controller detects that the rotating speed of the range extender reaches the starting target rotating speed n1 of the generator, requesting the generator controller to enter a 0-torque mode;
s, the range extender controller sends an ignition instruction and an engine target rotating speed n2 to the engine controller;
s, after the engine controller sends an ignition instruction for t2 seconds, the range extender starts steady-state regulation of the idle speed after the engine controller controls the engine speed to reach the target engine speed n 2;
and S eighthly, finishing starting, and judging that the range extender enters a heat engine state or a power generation working condition by the vehicle control unit according to the temperature T of the cooling liquid.
2. The control method of the range extender system of claim 1, further comprising a range extender shutdown step of:
when the vehicle control unit detects that the shutdown condition is met, the accelerator voltage signal sent by the range extender controller to the engine controller is 0, and the transmission of the rotating speed signal request is stopped;
t, the generator controller maintains a power generation mode and adjusts a torque reduction gradient according to the current running state of the range extender, so that the rotating speed of the range extender quickly reaches an idle target rotating speed n 0;
the range extender controller requests the generator controller to enter a 0-torque mode and requests the engine controller to carry out idle speed control;
t, the range extender controller requests the engine controller to enter an idle mode and maintains the idle accumulated idle time T3 seconds;
t, when the engine controller enters an idle mode and the accumulated idle time is less than T3 seconds, the range extender receives a new power demand instruction, and when the starting condition is met, the range extender enters the power generation working condition again;
t, when the engine controller enters an idle mode and the accumulated idle time is more than T3 seconds, the range extender is shut down;
and T, the range extender loses the rotating speed signal and stops the machine.
3. The control method of the range extender system according to claim 1, wherein the correspondence table of the coolant temperature and the target rotation speed is obtained by a test mapping and written in a control program of the range extender controller.
4. The control method of the range extender system according to claim 1, wherein during the starting process of the range extender, the range extender controller judges that the starting is failed after the loss time of the rotating speed signal exceeds a preset time after the torque instruction is sent out.
5. The control method of the range extender system according to claim 4, wherein the vehicle control unit accumulates the number of failed starts and limits the time interval between each start, and feeds back the start abnormality of the range extender after the accumulated number of failed starts reaches a preset value.
6. The control method of the range extender system of claim 5, wherein the interval time between each start of the range extender is greater than a preset value.
7. The control method of the range extender system according to claim 1, 2, 3, 4, 5 or 6, wherein the range extender controller controls the operation mode of the generator controller and assigns a torque command to the generator controller, and simultaneously controls the throttle opening of the engine controller and assigns a rotation speed command to the engine controller according to the power request sent by the vehicle control unit.
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| CN113428158A (en) * | 2021-07-14 | 2021-09-24 | 同济大学 | Internal combustion engine type range extender torsional vibration hybrid control method |
| CN113459833A (en) * | 2021-08-10 | 2021-10-01 | 合众新能源汽车有限公司 | Control method and control system of range extender |
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| CN113459833B (en) * | 2021-08-10 | 2024-01-12 | 合众新能源汽车股份有限公司 | Control method and control system of range extender |
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