CN108819937B - New energy automobile limping mode control method and system - Google Patents
New energy automobile limping mode control method and system Download PDFInfo
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- CN108819937B CN108819937B CN201810725852.5A CN201810725852A CN108819937B CN 108819937 B CN108819937 B CN 108819937B CN 201810725852 A CN201810725852 A CN 201810725852A CN 108819937 B CN108819937 B CN 108819937B
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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
- B60W20/50—Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
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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
- B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
- B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/08—Electric propulsion units
- B60W2510/081—Speed
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
- B60W2510/246—Temperature
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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
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
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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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
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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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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Abstract
The invention discloses a limping mode control method and a limping mode control system for a new energy automobile, wherein the method comprises the following steps: if the power battery is in fault, the relay is disconnected; if the engine runs, the whole vehicle enters a hybrid mode; if the engine is not started, when the coupler has a disconnection fault, the whole vehicle stops; when the coupler has no disconnection fault, starting the engine; in the hybrid mode, calculating a voltage closed loop forbidden state according to the working states of a finished automobile motor and a controller, the running state of an engine and the working state of a coupler, and entering a non-voltage closed loop limping mode if the voltage closed loop is forbidden to be activated; if the voltage closed loop is forbidden to be not activated, when the rotating speed of the motor is less than the preset rotating speed, a non-voltage closed loop limping mode is entered, and when the rotating speed of the motor is not less than the preset rotating speed, the voltage closed loop limping mode is entered; the method and the system can be flexibly configured according to actual conditions, have stronger redundancy, and can ensure that the whole vehicle enters a safe and controllable mode after the power battery is cut off, thereby ensuring the safety of the whole vehicle and passengers.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a limping mode control method and system for a new energy automobile.
Background
The rapid development of new energy automobiles makes the safety of new energy automobiles face a great test, so that the new energy automobiles pay attention to the treatment of key faults. Hybrid vehicles typically have two power sources, which are combined to provide driving power. Therefore, a problem is also generated, namely, after one power source fails, particularly after a power battery fails, how to switch to limp running of the other power source is generated, so that the whole vehicle enters a safe and controllable mode after the failure, and the vehicle can be guaranteed to continuously and reliably run to a safe area, which becomes a key point of attention of those skilled in the art.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a limp home mode control method for a new energy vehicle, so as to ensure that the entire vehicle enters a safe and controllable mode when a power battery fails, and to ensure safety of the vehicle and members.
In order to achieve the purpose, the invention provides the following technical scheme:
a limp home mode control method for a new energy automobile comprises the following steps:
1) detecting the working state of the power battery;
2) if the power battery has faults, disconnecting a relay of the power battery, and calculating a voltage closed loop demand state;
3) judging the state of the engine, and if the engine is in the running state, enabling the whole vehicle to enter a hybrid mode; if the engine is not started, judging the state of the coupler, and if the coupler has a disconnection fault, stopping the whole vehicle; if the coupler has no disconnection fault, starting the engine;
4) if the engine is started, the whole vehicle enters a hybrid mode; if the engine fails to start, stopping the whole vehicle when the continuous starting failure times of the engine exceed the preset times; when the number of times of failed starting of the engine does not exceed the preset number of times, continuing to start the engine;
5) in the hybrid mode, calculating a voltage closed loop prohibition state according to the working states of a motor and a controller of the whole vehicle, the running state of an engine and the working state of a coupler, and if the voltage closed loop prohibition state is in an activated state, enabling the whole vehicle to enter a non-voltage closed loop limping mode; and if the voltage closed loop is forbidden to be in the non-activated state, when the rotating speed of the motor of the whole vehicle is less than the preset rotating speed, the whole vehicle enters a non-voltage closed loop limping mode, and when the rotating speed of the motor of the whole vehicle is not less than the preset rotating speed, the whole vehicle enters a voltage closed loop limping mode.
Preferably, in the step 3), if the coupler has no disconnection fault, the starting mode of the engine is judged, and when the vehicle speed is greater than or equal to a preset value, the coupler is closed to drag the engine to start; when the speed of the vehicle is less than the preset value, the starting motor drags the engine to start.
Preferably, in the step 5), the vehicle enters a non-voltage closed-loop limp home mode, and simultaneously, the DC/DC converter is turned off, the vehicle speed is limited, and the fault lamp is turned on.
Preferably, in the step 5), when the whole vehicle enters a voltage closed loop limp mode, the DC/DC converter is turned on to supply power to the low-voltage power system, so as to limit the vehicle speed.
Preferably, the method further comprises the steps of:
6) and monitoring the state of the whole vehicle in real time, and controlling the switching between the voltage closed-loop limping mode and the non-voltage closed-loop limping mode according to the state.
A limp home mode control system of a new energy automobile comprises:
the vehicle control unit is used for detecting and confirming the fault of the power battery system, judging whether the condition for entering the limp mode is met or not, and controlling the vehicle to enter the corresponding limp mode;
the battery system comprises a power battery and a battery controller, wherein the battery controller is connected with the whole vehicle control unit and is used for monitoring the state of the power battery, judging whether a fault needing to disconnect a power battery relay exists or not and informing the whole vehicle control unit;
the engine system comprises an engine, a starting motor and an electronic fuel injection controller used for controlling the engine to work, wherein the starting motor and the electronic fuel injection controller are connected with the whole vehicle control unit, the electronic fuel injection controller controls the work of the engine, detects the fault of the engine in real time, judges whether the fault affecting the limp-home mode entering is influenced, and informs the whole vehicle control unit;
the motor controller, the DC/DC converter and the coupling controller are connected in parallel with the whole vehicle control unit, the power battery, the motor controller and the DC/DC converter form a high-voltage loop through a high-voltage wire harness, and the motor controller is used for detecting the state of a whole vehicle motor, judging whether a fault affecting the limp mode entering is influenced or not, and informing the whole vehicle control unit; the coupling controller is used for coupling transmission of two power sources of the engine and the finished automobile motor, detecting the fault of the coupler in real time, judging whether the fault affecting the limp mode entering is influenced or not, and informing the finished automobile control unit; the DC/DC converter is used for converting the direct current high voltage of the power battery into direct current low voltage.
Preferably, the vehicle control unit is connected with the battery controller, the motor controller, the DC/DC converter, the coupling controller and the electric injection controller through CAN communication lines.
Preferably, the battery controller is connected with the power battery, the electronic injection controller is connected with the engine, and the starting motor is connected with the vehicle control unit through hard wires.
In order to achieve the first object, the invention provides a limp home mode control method of a new energy automobile, which comprises the following steps: detecting the working state of the power battery; if the power battery has faults, disconnecting a relay of the power battery, and calculating a voltage closed loop demand state; judging the state of the engine, and if the engine is in the running state, enabling the whole vehicle to enter a hybrid mode; if the engine is not started, judging the state of the coupler, and if the coupler has a disconnection fault, stopping the whole vehicle; if the coupler has no disconnection fault, starting the engine; if the engine is started, the whole vehicle enters a hybrid mode; if the engine fails to start, stopping the whole vehicle when the continuous starting failure times of the engine exceed the preset times; when the number of times of failed starting of the engine does not exceed the preset number of times, continuing to start the engine; in the hybrid mode, calculating a voltage closed loop prohibition state according to the working states of a motor and a controller of the whole vehicle, the running state of an engine and the working state of a coupler, and if the voltage closed loop prohibition state is in an activated state, enabling the whole vehicle to enter a non-voltage closed loop limping mode; if the voltage closed loop is forbidden to be in the non-activated state, when the rotating speed of a motor of the whole vehicle is less than the preset rotating speed, the whole vehicle enters a non-voltage closed loop limping mode, and when the rotating speed of the motor of the whole vehicle is not less than the preset rotating speed, the whole vehicle enters a voltage closed loop limping mode;
in order to achieve the second object, the invention further provides a limp home mode control system of the new energy automobile, which comprises a whole automobile control unit, a battery system, an engine system, a motor controller, a DC/DC converter and a coupling controller, wherein the whole automobile control unit is used for detecting and confirming the fault of the power battery system, judging whether the condition for entering the limp home mode is met, and controlling to enter the corresponding limp home mode; the battery system comprises a power battery and a battery controller, the battery controller is connected with the vehicle control unit, and the battery controller is used for monitoring the state of the power battery, including a high-voltage power-on state, a battery temperature, a battery voltage, a battery current, a high-voltage interlock, an insulation state and the like, judging whether a fault that a power battery relay needs to be disconnected exists or not, and timely informing the vehicle control unit; the engine system comprises an engine, a starting motor and an electronic fuel injection controller for controlling the engine to work, wherein the starting motor and the electronic fuel injection controller are connected with a finished automobile control unit; the motor controller, the DC/DC converter and the coupling controller are connected in parallel to the vehicle control unit, the power battery, the motor controller and the DC/DC converter form a high-voltage loop through a high-voltage wire harness, and the motor controller is used for detecting the working states, the temperatures and the like of the motor and the controller, judging whether a fault influencing the limp mode entering is caused or not, and timely informing the vehicle control unit; the coupling controller is used for coupling transmission of two power sources of the engine and the motor, detecting the fault of the coupler in real time, judging whether the fault affecting entering a limp mode exists or not, and informing the whole vehicle control unit; the DC/DC converter is used for converting the direct-current high voltage of the power battery into direct-current low voltage and supplying power to the 12V storage battery and the low-voltage power utilization component;
in summary, the limp mode control method and system for the new energy automobile are not limited to the medium hybrid automobile and the plug-in hybrid automobile, can be flexibly configured according to actual conditions, have high redundancy, and can perform timely and effective processing after the power battery fault is cut off, so that the whole automobile enters a safe and controllable mode, for example, the limp mode is entered to drive to a safe area or stop immediately, and the safety of the whole automobile and passengers is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a limp home mode control method of a new energy vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart of a limp home mode control method of a new energy vehicle according to another embodiment of the invention;
fig. 3 is a connection structure diagram of the limp home mode control system of the new energy vehicle according to the embodiment of the invention.
In the figure:
1 is a vehicle control unit; 2 is a power battery; 3 is a battery controller; 4 is a motor controller; 5 is a coupling controller; 6 is a DC/DC converter; 7 is an electric spray controller; 8 is an engine; 9 is a starting motor; 10. 11, 12 are hard wires; 13 is a high voltage wire harness; and 14 is a CAN communication line.
Detailed Description
The invention provides a limp mode control method of a new energy automobile, which can ensure that the whole automobile enters a safe and controllable mode and ensure the safety of the automobile and members when a power battery fails.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a limp home mode control method of a new energy vehicle according to an embodiment of the invention.
The embodiment of the invention provides a control method for a limping mode of a new energy automobile, which comprises the following steps:
s1: detecting the working state of the power battery 2;
the operating state of the power battery 2 includes a high-voltage power-on state, a battery temperature, a battery voltage, a battery current, a high-voltage interlock, an insulation state, and the like.
S2: if the power battery 2 has a fault, disconnecting a relay of the power battery 2 and calculating a voltage closed loop requirement state;
s3: judging the state of the engine 8, and if the engine 8 is in the running state, enabling the whole vehicle to enter a hybrid mode; if the engine 8 is not started, judging the state of the coupler, and if the coupler has a disconnection fault, stopping the whole vehicle; if the coupler has no disconnection fault, starting the engine 8;
s4: if the engine 8 is started, the whole vehicle enters a Hybrid Electric Vehicle (HEV); if the starting of the engine 8 fails, stopping the whole vehicle when the continuous starting failure times of the engine 8 exceed the preset times; when the number of times of failed start-up of the engine 8 does not exceed the preset number of times, continuing to start the engine 8;
s5: in the hybrid mode, a voltage closed loop prohibition state is calculated according to the working states of a motor and a controller of the whole vehicle, the running state of the engine 8 and the working state of the coupler, and if the voltage closed loop prohibition state is in an activated state, the whole vehicle enters a non-voltage closed loop limping mode; and if the voltage closed loop is forbidden to be in the non-activated state, when the rotating speed of the motor of the whole vehicle is less than the preset rotating speed, the whole vehicle enters a non-voltage closed loop limping mode, and when the rotating speed of the motor of the whole vehicle is not less than the preset rotating speed, the whole vehicle enters a voltage closed loop limping mode.
Compared with the prior art, the limp mode control method of the new energy automobile is not limited to a medium hybrid automobile and a plug-in hybrid automobile, can be flexibly configured according to actual conditions, has high redundancy, and can perform timely and effective treatment after the power battery 2 is cut off, so that the whole automobile enters a safe and controllable mode, for example, the limp mode is used for driving to a safe area or immediately stopping, and the safety of the whole automobile and passengers is ensured.
Further optimizing the above technical solution, please refer to fig. 2, and fig. 2 is a flowchart of a limp home mode control method of a new energy vehicle according to another embodiment of the present invention.
In the embodiment, the control method for the limp home mode of the new energy automobile comprises the following steps:
s1: detecting the working state of the power battery 2;
the operating state of the power battery 2 includes a high-voltage power-on state, a battery temperature, a battery voltage, a battery current, a high-voltage interlock, an insulation state, and the like.
S2: if the power battery 2 has a fault, disconnecting a relay of the power battery 2 and calculating a voltage closed loop requirement state;
s3: judging the state of the engine 8, and if the engine 8 is in a running state, enabling the whole vehicle to enter a Hybrid Electric Vehicle (HEV) mode; if the engine 8 is not started, judging the state of the coupler, and if the coupler has a disconnection fault, stopping the whole vehicle; if the coupler has no disconnection fault, judging the mode of starting the engine 8 according to the vehicle speed, namely closing the coupler to drag the engine 8 to start when the vehicle speed is greater than or equal to a preset value; when the vehicle speed is less than the preset value, the starter motor 9 drags the engine 8 to start.
Specifically, in the embodiment of the present invention, the preset value of the vehicle speed is 10 km/h.
S4: if the engine 8 is started, the whole vehicle enters a Hybrid Electric Vehicle (HEV); if the starting of the engine 8 fails, stopping the whole vehicle when the continuous starting failure times of the engine 8 exceed the preset times; when the number of times of failed start-up of the engine 8 does not exceed the preset number of times, continuing to start the engine 8;
in the embodiment of the invention, the preset times are 4, namely when the continuous starting failure times of the engine 8 exceed 4 times, the whole vehicle stops; when the number of failed starts of the engine 8 does not exceed 4, the engine 8 is continuously started.
S5: in the hybrid mode, a voltage closed loop prohibition state is calculated according to the working states of a motor and a controller of the whole vehicle, the running state of the engine 8 and the working state of the coupler, and if the voltage closed loop prohibition state is in an activated state, the whole vehicle enters a non-voltage closed loop limping mode; and if the voltage closed loop is forbidden to be in the non-activated state, when the rotating speed of the motor of the whole vehicle is less than the preset rotating speed, the whole vehicle enters a non-voltage closed loop limping mode, and when the rotating speed of the motor of the whole vehicle is not less than the preset rotating speed, the whole vehicle enters a voltage closed loop limping mode.
In the embodiment of the present invention, the preset rotation speed is preferably 650 rpm.
In step S5, since the low-voltage supply is in trouble and the non-voltage closed-loop limp mode can only ensure that the vehicle performs a transient limp, in the embodiment of the present invention, the DC/DC converter 6 is turned off, the vehicle speed is limited, and the fault lamp is turned on while the entire vehicle enters the non-voltage closed-loop limp mode.
In step S5, in the voltage closed-loop limp mode, the low-voltage power supply is not affected, and the vehicle can perform relatively long limp running, so that the DC/DC converter 6 is turned on to supply power to the low-voltage power system and limit the vehicle speed when the entire vehicle enters the voltage closed-loop limp mode.
Further optimizing the technical scheme, the control method for the limp home mode of the new energy automobile further comprises the following steps:
s6: and monitoring the state of the whole vehicle in real time, and controlling the switching between the voltage closed-loop limping mode and the non-voltage closed-loop limping mode according to the state.
The invention also provides a limp home mode control system of a new energy automobile, please refer to fig. 2, fig. 2 is a connection structure diagram of the limp home mode control system of the new energy automobile provided by the embodiment of the invention, the system comprises a vehicle control unit 1(VCU), a battery system, an engine 8 system, a motor controller 4, a DC/DC converter 6 and a coupling controller 5, wherein the vehicle control unit 1 is used for detecting and confirming a system fault of a power battery 2, judging whether a condition for entering the limp home mode is met, and controlling to enter the corresponding limp home mode; the battery system comprises a power battery 2 and a battery controller 3(BCU), the battery controller 3 is connected with the whole vehicle control unit 1, and the battery controller 3 is used for monitoring the state of the power battery 2, including a high-voltage power-on state, a battery temperature, a battery voltage, a battery current, a high-voltage interlock, an insulation state and the like, judging whether a fault that a relay of the power battery 2 needs to be disconnected exists or not, and timely informing the whole vehicle control unit 1; the engine 8 system comprises an engine 8, a starting motor 9 and an electronic fuel injection controller 7(ECU) for controlling the engine 8 to work, wherein the starting motor 9 and the electronic fuel injection controller 7 are both connected with the whole vehicle control unit 1, the electronic fuel injection controller 7 controls the work of the engine 8, detects the fault of the engine 8 in real time, judges whether the fault affecting the limp-home mode entering is influenced or not, and informs the whole vehicle control unit 1; the motor controller 4, the DC/DC converter 6 and the coupling controller 5 are connected in parallel to the vehicle control unit 1, the power battery 2, the motor controller 4 and the DC/DC converter 6 form a high-voltage loop through a high-voltage wire harness 13, and the motor controller 4 is used for detecting the working states, temperatures and the like of the motor and the controller, judging whether a fault affecting entering a limp-home mode exists or not, and timely informing the vehicle control unit 1; the coupling controller 5 is used for coupling transmission of two large power sources of the engine 8 and the motor, detecting the fault of the coupler in real time, judging whether the fault affecting entering a limp-home mode exists or not, and informing the whole vehicle control unit 1; the DC/DC converter 6 is used for converting the direct current high voltage of the power battery 2 into direct current low voltage and supplying power for the 12V storage battery and low-voltage power utilization components.
According to the technical scheme, the whole vehicle control unit 1 is connected with the battery controller 3, the motor controller 4, the DC/DC converter 6, the coupling controller 5 and the electric injection controller 7 through CAN communication lines 14, and the whole vehicle control unit 1, the battery controller 3, the motor controller 4, the DC/DC converter 6, the coupling controller 5 and the electric injection controller 7 form a CAN communication network interactive acquisition or control command signal through the CAN communication lines 14.
In the embodiment of the invention, the battery controller 3 and the power battery 2, the electronic fuel injection controller 7 and the engine 8, and the starting motor 9 and the vehicle control unit 1 are connected through hard wires 10(11, 12).
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A limp home mode control method of a new energy automobile is characterized by comprising the following steps:
1) detecting the working state of the power battery;
2) if the power battery has faults, disconnecting a relay of the power battery, and calculating a voltage closed loop demand state;
3) judging the state of the engine, and if the engine is in the running state, enabling the whole vehicle to enter a hybrid mode; if the engine is not started, judging the state of the coupler, and if the coupler has a disconnection fault, stopping the whole vehicle; if the coupler has no disconnection fault, starting the engine;
4) if the engine is started, the whole vehicle enters a hybrid mode; if the engine fails to start, stopping the whole vehicle when the continuous starting failure times of the engine exceed the preset times; when the number of times of failed starting of the engine does not exceed the preset number of times, continuing to start the engine;
5) in the hybrid mode, calculating a voltage closed loop prohibition state according to the working states of a motor and a controller of the whole vehicle, the running state of an engine and the working state of a coupler, and if the voltage closed loop prohibition state is in an activated state, enabling the whole vehicle to enter a non-voltage closed loop limping mode; and if the voltage closed loop is forbidden to be in the non-activated state, when the rotating speed of the motor of the whole vehicle is less than the preset rotating speed, the whole vehicle enters a non-voltage closed loop limping mode, and when the rotating speed of the motor of the whole vehicle is not less than the preset rotating speed, the whole vehicle enters a voltage closed loop limping mode.
2. The limp home mode control method of the new energy automobile as claimed in claim 1, wherein in the step 3), if the coupler has no disconnection fault, the engine starting mode is judged, and when the speed of the automobile is greater than or equal to a preset value, the coupler is closed to drive the engine to start; when the speed of the vehicle is less than the preset value, the starting motor drags the engine to start.
3. The limp home mode control method of the new energy automobile as claimed in claim 1, wherein in the step 5), the finished automobile enters a non-voltage closed loop limp home mode, and meanwhile, the DC/DC converter is turned off, the automobile speed is limited, and a fault lamp is turned on.
4. The limp home mode control method of the new energy automobile as claimed in claim 1, wherein in the step 5), when the whole automobile enters a voltage closed loop limp home mode, the DC/DC converter is turned on to supply power to a low-voltage power system, and the automobile speed is limited.
5. The control method for the limp home mode of the new energy automobile as claimed in any one of claims 1 to 4, further comprising the steps of:
6) and monitoring the state of the whole vehicle in real time, and controlling the switching between the voltage closed-loop limping mode and the non-voltage closed-loop limping mode according to the state.
6. A limp home mode control system of a new energy automobile, comprising:
the vehicle control unit is used for detecting and confirming the fault of the power battery system, judging whether the condition for entering the limp mode is met or not, and controlling the vehicle to enter the corresponding limp mode;
the battery system comprises a power battery and a battery controller, wherein the battery controller is connected with the whole vehicle control unit and is used for monitoring the state of the power battery, judging whether a fault needing to disconnect a power battery relay exists or not and informing the whole vehicle control unit;
the engine system comprises an engine, a starting motor and an electronic fuel injection controller used for controlling the engine to work, wherein the starting motor and the electronic fuel injection controller are connected with the whole vehicle control unit, the electronic fuel injection controller controls the work of the engine, detects the fault of the engine in real time, judges whether the fault affecting the limp-home mode entering is influenced, and informs the whole vehicle control unit;
the motor controller, the DC/DC converter and the coupling controller are connected in parallel with the whole vehicle control unit, the power battery, the motor controller and the DC/DC converter form a high-voltage loop through a high-voltage wire harness, and the motor controller is used for detecting the state of a whole vehicle motor, judging whether a fault affecting the limp mode entering is influenced or not, and informing the whole vehicle control unit; the coupling controller is used for coupling transmission of two power sources of the engine and the finished automobile motor, detecting the fault of the coupler in real time, judging whether the fault affecting the limp mode entering is influenced or not, and informing the finished automobile control unit; the DC/DC converter is used for converting the direct current high voltage of the power battery into direct current low voltage.
7. The system for controlling the limp home mode of the new energy automobile as claimed in claim 6, wherein the whole automobile control unit, the battery controller, the motor controller, the DC/DC converter, the coupling controller and the electric injection controller are all connected through CAN communication lines.
8. The system for controlling the limp home mode of the new energy automobile as claimed in claim 6, wherein the battery controller and the power battery, the electronic fuel injection controller and the engine, and the starting motor and the vehicle control unit are all connected through hard wires.
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| CN109624982B (en) * | 2019-01-28 | 2021-03-30 | 汉腾汽车有限公司 | Plug-in hybrid electric vehicle driving mode selection method |
| CN110877607B (en) * | 2019-11-26 | 2021-04-06 | 重庆长安汽车股份有限公司 | Self-power-generation limping system and method for hybrid electric vehicle |
| CN111572530B (en) * | 2020-05-19 | 2021-12-17 | 东风汽车有限公司 | Hybrid electric vehicle failure guarantee method and electronic equipment |
| CN111717029B (en) * | 2020-06-08 | 2022-03-22 | 北京汽车股份有限公司 | Limp-home mode low-voltage load power supply control method and system and hybrid electric vehicle |
| CN111661030B (en) * | 2020-06-10 | 2021-10-08 | 中国第一汽车股份有限公司 | Starter control method and system of hybrid vehicle and hybrid vehicle |
| CN112124300A (en) * | 2020-09-02 | 2020-12-25 | 长城汽车股份有限公司 | Vehicle limp control method and controller |
| CN114248757A (en) * | 2020-09-25 | 2022-03-29 | 北京宝沃汽车股份有限公司 | Vehicle control method, vehicle control device, storage medium and hybrid vehicle |
| EP4032737B1 (en) * | 2020-11-04 | 2023-10-04 | Zhejiang Geely Holding Group Co., Ltd. | Hybrid vehicle and control method and system after hybrid vehicle battery failure |
| CN114506218A (en) * | 2022-01-06 | 2022-05-17 | 山东汽车制造有限公司 | Limping control method of electric automobile |
| CN114715137A (en) * | 2022-03-29 | 2022-07-08 | 江铃汽车股份有限公司 | Hybrid electric vehicle control method, system, computer and readable storage medium |
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| JP4158363B2 (en) * | 2001-08-01 | 2008-10-01 | アイシン・エィ・ダブリュ株式会社 | Hybrid vehicle drive control device |
| WO2009039681A1 (en) * | 2007-09-28 | 2009-04-02 | Guilin Geely Stars Oil-Electric Hybrid Engine Co., Ltd. | A power apparatus for oil-electricity hybrid vehicle and the operation control method thereof |
| CN104176058B (en) * | 2014-08-22 | 2017-01-18 | 江苏大学 | Pure electric vehicle drive working condition recognizing method based on multi-information fusion |
| CN105644547B (en) * | 2016-02-02 | 2018-02-06 | 中国第一汽车股份有限公司 | The limping control system and method for a kind of double-motor hybrid vehicle electrokinetic cell failure in the process of moving |
| CN105966226B (en) * | 2016-06-14 | 2018-05-15 | 中国第一汽车股份有限公司 | A kind of plug-in gas-electricity hybrid power coach whole-control system and its control method |
| CN107901904B (en) * | 2017-10-13 | 2019-07-30 | 潍柴动力股份有限公司 | The control method and hybrid vehicle of hybrid vehicle limp-home |
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