CN110877607A - Self-power-generation limping system and method for hybrid electric vehicle - Google Patents
Self-power-generation limping system and method for hybrid electric vehicle Download PDFInfo
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- CN110877607A CN110877607A CN201911173050.9A CN201911173050A CN110877607A CN 110877607 A CN110877607 A CN 110877607A CN 201911173050 A CN201911173050 A CN 201911173050A CN 110877607 A CN110877607 A CN 110877607A
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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
- B60W20/00—Control systems specially adapted for hybrid vehicles
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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 self-generating limping system and a self-generating limping method for a hybrid electric vehicle1、R2、...、Rn(ii) a When the 48V lithium battery has a fault, the IBSG motor is requested to enter an idle mode, then the idling of the engine is pre-charged and adjusted, after the voltage in the circuit of the IBSG motor and the rotating speed of the IBSG motor meet the requirements, the IBSG motor is requested to enter a power generation mode to generate power, and the R is forbidden1、R2、...、RnAnd switching on/off, and then converting the output voltage of the IBSG motor to charge the storage battery. According to the invention, after the 48V lithium battery is broken down, the IBSG motor can continue to generate power, so that the situation of half-way feeding and groveling is avoided。
Description
Technical Field
The invention relates to the field of hybrid electric vehicle control, in particular to a self-generating limping system and a self-generating limping method of a hybrid electric vehicle.
Background
With the average oil consumption requirement of the national four-stage whole vehicle enterprises, each large vehicle enterprise urgently needs a new oil-saving technical scheme which is low in cost and easy to integrate into the existing vehicle type to achieve the purpose of reducing the oil consumption, and at the moment, the 48V power supply system just meets the requirement. Compared with a power supply system of a traditional fuel oil automobile, a 48V power supply system of a hybrid electric automobile mainly adds three core parts: the IBSG motor (namely a 48V power-assisted recovery motor), the DC converter DCDC and the 48V lithium battery (BMS, Battery management System) have the functions of starting and stopping, braking energy recovery, accelerating power assistance and the like, save the oil consumption (under the NEDC working condition) of 8-15% for the passenger vehicle, and reduce the emission to some extent.
Although from 2016, domestic mainstream automobile factories have come on the market for a plurality of models carrying 48V systems; however, due to the short development time, the technology is not fully developed, especially the matching between the whole 48V parts and the matching between the 48V system and the whole vehicle still have certain imperfection, and the system function is not fully developed. At present, based on a whole vehicle framework, most of large host plants adopt Hybrid-CAN composed of an IBSG motor, a direct current converter DCDC and a 48V lithium battery to realize a system communication function, under the condition that the 48V lithium battery breaks down, the IBSG motor cannot normally work to generate electricity, a half-way nest-bending phenomenon CAN occur in the driving process of a vehicle, and customer complaints are caused.
Disclosure of Invention
The invention aims to provide a self-generating limping system and a self-generating limping method for a hybrid electric vehicle, so that an IBSG motor can continue to generate power after a 48V lithium battery is broken down, and the situation of half-way feeding and groveling is avoided.
The invention discloses a self-power-generation limping system of a hybrid electric vehicle, which comprises an IBSG motor, an engine, a 48V lithium battery, an engine control unit, a storage battery and a direct-current converter DCDC, wherein the engine control unit is respectively connected with the IBSG motor, the engine, the 48V lithium battery and the direct-current converter DCDC through signal lines, the 48V lithium battery is respectively connected with the IBSG motor and the direct-current converter DCDC through power lines, the storage battery is respectively connected with the engine control unit and the direct-current converter DCDC through the power lines, the IBSG motor is in transmission connection with the engine, the engine control unit is connected with a load of a whole vehicle through the signal lines, and the storage battery is connected.
After the 48V lithium battery is disconnected due to faults, in order to enable the IBSG motor to continuously maintain the power generation function, the IBSG motor has requirements on the external conditions such as the engine speed, the storage battery voltage, the DC converter DCDC pre-charging voltage and the like. After the 48V lithium cell breaks down the disconnection, when load end current fluctuation is great, if the IBSG motor continues the electricity generation, then the fluctuation of output voltage of IBSG motor can aggravate, leads to the IBSG motor because under-voltage or excessive pressure and gets into the fault state, if the IBSG motor stops the electricity generation, then the vehicle can only rely on the residual capacity of battery to continue to travel a segment distance, then appears the half-way feed condition of lying prone nest. In order to enable the IBSG motor to continue generating power after the 48V lithium battery is broken down, avoid the IBSG motor from entering a fault state due to undervoltage or overvoltage and avoid the situation of half-way feeding groveling, an engine control unit in the invention is programmed so as to execute the following steps:
firstly, setting the current fluctuation value of the whole vehicle load to be greater than the set current fluctuation threshold value to be R1、R2、...、RnThen, the second step is executed;
secondly, judging whether the 48V lithium battery has faults or not, if so, executing the third step, otherwise, continuously executing the second step;
step three, sending a command for requesting the IBSG motor to enter an idle mode to the IBSG motor, and then executing step four;
fourthly, controlling a direct current converter DCDC to carry out pre-charging, adjusting the idling speed of the engine, and then executing a fifth step;
step five, judging whether the voltage in the IBSG motor loop is larger than a preset pre-charging target voltage value and the rotating speed of the IBSG motor is in a set rotating speed range, if so, executing the step six, otherwise, continuously executing the step five;
sixthly, sending a command for requesting the IBSG motor to generate power by taking the set voltage as an output voltage to the IBSG motor, and forbidding R1、R2、...、RnPerforming on/off switching, and then executing a seventh step;
and seventhly, controlling the direct current converter DCDC to convert the output voltage of the IBSG motor, charging the storage battery, and then finishing.
In a similar way, the invention also provides a self-generating limping method of the hybrid electric vehicle, which comprises the following steps:
firstly, an engine control unit is arranged on a whole vehicleThe load of the electrical appliance with the current fluctuation value larger than the set current fluctuation threshold value when the current fluctuation value is opened/closed in the load is R1、R2、...、RnThen, the second step is executed;
secondly, the engine control unit judges whether the 48V lithium battery has faults or not, if so, the third step is executed, otherwise, the second step is continuously executed;
thirdly, the engine control unit sends a command for requesting the IBSG motor to enter an idle mode to the IBSG motor, and then executes the fourth step;
fourthly, the engine control unit controls the direct current converter DCDC to carry out pre-charging, adjusts the idling speed of the engine and then executes the fifth step;
fifthly, the engine control unit judges whether the voltage in the IBSG motor loop is larger than a preset pre-charging target voltage value and the rotating speed of the IBSG motor is in a set rotating speed range, if so, the sixth step is executed, otherwise, the fifth step is continuously executed;
sixthly, the engine control unit sends a command for requesting the IBSG motor to generate power by taking the set voltage as an output voltage to the IBSG motor, and forbids the R1、R2、...、RnPerforming on/off switching, and then executing a seventh step;
and seventhly, controlling the direct current converter DCDC to convert the output voltage of the IBSG motor and charge the storage battery by the engine control unit, and then ending.
Preferably, the set current fluctuation threshold is a current fluctuation value a which is obtained through bench test simulation and causes the IBSG motor to exit the power generation mode.
Preferably, the current fluctuation value of each electric appliance load in the whole vehicle load when the electric appliance load is turned on/off is obtained through a whole vehicle load power verification test.
Preferably, the set pre-charging target voltage value is 45V, the set rotating speed range is 2500-18000 rpm, and the set voltage value range is 38-42V (i.e. the set voltage is a certain voltage value between 38V and 42V, including 38V and 42V).
The system and the method adopting the inventionThe method can ensure that the IBSG motor operates according to set logic and continues to maintain the power generation function after the 48V lithium battery is disconnected due to faults, and the load R of the electric appliance is forbidden in the power generation process1、R2、...、RnSwitching on/off (through the mode that the limit load end electric current is undulant promptly), guaranteed the stable output of IBSG motor, the effectual IBSG motor of having avoided gets into excessive pressure or the load suddenly falls the fault condition, the output voltage of IBSG motor charges for the battery after direct current converter DCDC transform, the battery is for putting in order the car load (put in order car promptly with electrical apparatus) power supply, it is farther to guarantee that the vehicle can travel, the half way feed condition of laying prone nest can not appear, user experience sense and vehicle quality have been improved.
Drawings
Fig. 1 is a connection block diagram of a self-generating limp home system of a hybrid electric vehicle and a load of the whole vehicle.
Fig. 2 is a flow chart of a self-generating limping method of the hybrid electric vehicle in the invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The self-power-generation limp-home system of the hybrid electric vehicle shown in fig. 1 comprises an IBSG motor 1, an engine 2, a 48V lithium battery 3, an engine control unit 4, a direct current converter DCDC5 and a storage battery 7 (a 12V storage battery is adopted), wherein the engine control unit 4 is connected with the IBSG motor 1, the engine 2, the 48V lithium battery 3 and a direct current converter DCDC5 through signal lines respectively, the storage battery 7 is connected with the engine control unit 4 through a power line, the storage battery 7 supplies power to the engine control unit 4, the storage battery 7 is connected with a direct current converter DCDC5 through a power line, the direct current converter DCDC5 is connected with the 48V lithium battery 3 through a power line, the IBSG motor 1 is in transmission connection with the engine 2, the IBSG motor 1 can rotate under the driving of the engine 2, and the IBSG motor 1 can also drive a flywheel of the engine; meanwhile, the storage battery 7 is also connected with the whole vehicle load 6 through a power line to supply power to the whole vehicle load 6, and the engine control unit 4 is also connected with the whole vehicle load 6 through a signal line to realize the control of each electric appliance load in the whole vehicle load 6. The hardware structure of the self-generating limping system of the hybrid electric vehicle is the prior art.
Before designing a self-generating limping method of a hybrid electric vehicle, firstly, obtaining a current fluctuation value A when an IBSG motor is out of a generating mode through bench test simulation (the simulation method is the prior art); and then, obtaining the current fluctuation value of each electric appliance load in the whole vehicle load 6 when the electric appliance load is turned on/off through a whole vehicle load power verification test (the verification test method is also the prior art).
The self-power-generation limping method of the hybrid electric vehicle shown in fig. 2 adopts the system, and specifically comprises the following steps:
firstly, the motor control unit 4 sets the current fluctuation value of the whole vehicle load 6 when the current fluctuation value is larger than the current fluctuation value A to be R1、R2、...、RnThen, the second step is executed;
secondly, the engine control unit 4 judges whether the 48V lithium battery has a fault, if so, the third step is executed, otherwise, the second step is continuously executed;
thirdly, the engine control unit 4 sends a command for requesting the IBSG motor 1 to enter an idle mode to the IBSG motor 1, the IBSG motor 1 enters the idle mode after receiving the command, and then the fourth step is executed;
fourthly, the engine control unit 4 controls the direct current converter DCDC5 to perform pre-charging, the engine control unit 4 adjusts the idle speed of the engine (the rotation speed of the IBSG motor is adjusted by adjusting the idle speed of the engine), and then the fifth step is executed;
fifthly, the engine control unit 4 judges whether the voltage in the circuit of the IBSG motor is more than 45V and the rotating speed of the IBSG motor is 2500-18000 rpm, if so, the sixth step is executed, otherwise, the fifth step is continuously executed;
sixthly, the engine control unit 4 sends a command for requesting the IBSG motor 1 to generate power by taking 42V as an output voltage to the IBSG motor 1, the IBSG motor 1 generates power according to the target output voltage of 42V after receiving the command (the power generation process is a process of converting kinetic energy transmitted by the engine into electric energy), and the engine control unit 4 prohibits R1、R2、...、RnPerforming on/off switching, and then executing a seventh step;
and seventhly, the engine control unit 4 controls the direct current converter DCDC5 to convert the output voltage of the IBSG motor 1 and charge the battery 7 so that the battery 7 supplies power to the vehicle load 6, and then the operation is finished.
Claims (8)
1. A self-generating limping system of a hybrid electric vehicle comprises an IBSG motor (1), an engine (2), a 48V lithium battery (3), an engine control unit (4), a storage battery (7) and a direct current converter DCDC (5), wherein the engine control unit (4) is respectively connected with the IBSG motor (1), the engine (2), the 48V lithium battery (3) and the direct current converter DCDC (5) through signal lines, the 48V lithium battery (3) is respectively connected with the IBSG motor (1) and the direct current converter DCDC (5) through power lines, the storage battery (7) is respectively connected with the engine control unit (4) and the direct current converter DCDC (5) through power lines, the IBSG motor (1) is in transmission connection with the engine (2), the engine control unit (4) is connected with a vehicle load (6) through a signal line, and the storage battery (7) is connected with the vehicle load (6) through a power line; characterized in that said engine control unit (4) is programmed so as to perform the following steps:
firstly, setting the current fluctuation value of the whole vehicle load (6) to be greater than the set current fluctuation threshold value, and setting the load of the electrical appliance to be R1、R2、...、RnThen, the second step is executed;
secondly, judging whether the 48V lithium battery has faults or not, if so, executing the third step, otherwise, continuously executing the second step;
thirdly, sending a command for requesting the IBSG motor (1) to enter an idle mode to the IBSG motor (1), and then executing the fourth step;
fourthly, controlling a direct current converter DCDC (5) to carry out pre-charging, adjusting the idling speed of the engine, and then executing a fifth step;
step five, judging whether the voltage in the IBSG motor loop is larger than a preset pre-charging target voltage value and the rotating speed of the IBSG motor is in a set rotating speed range, if so, executing the step six, otherwise, continuously executing the step five;
sixthly, sending a command for requesting the IBSG motor (1) to generate power by taking the set voltage as an output voltage to the IBSG motor (1), and forbidding R1、R2、...、RnPerforming on/off switching, and then executing a seventh step;
and seventhly, controlling a direct current converter DCDC (5) to convert the output voltage of the IBSG motor (1) and then charge a storage battery (7), and then finishing.
2. The self-generating limp home system of the hybrid electric vehicle according to claim 1, wherein: the set current fluctuation threshold value is a current fluctuation value A which is obtained through bench test simulation and causes the IBSG motor (1) to exit the power generation mode.
3. The self-generating limp home system of the hybrid electric vehicle according to claim 1 or 2, wherein: and obtaining the current fluctuation value of each electric appliance load in the whole vehicle load (6) when the electric appliance load is switched on/off through a whole vehicle load power verification test.
4. The self-generating limp home system of the hybrid electric vehicle according to claim 3, wherein: the set pre-charging target voltage value is 45V, the set rotating speed range is 2500-18000 rpm, and the set voltage value range is 38-42V.
5. A self-generating limping method of a hybrid electric vehicle is characterized by comprising the following steps:
firstly, an engine control unit (4) sets the current fluctuation value of an electric appliance load with the current fluctuation value larger than a set current fluctuation threshold value when the electric appliance load is opened/closed in a whole vehicle load (6) as R1、R2、...、RnThen, the second step is executed;
secondly, the engine control unit (4) judges whether the 48V lithium battery has faults or not, if so, the third step is executed, otherwise, the second step is continuously executed;
thirdly, the engine control unit (4) sends a command for requesting the IBSG motor (1) to enter an idle mode to the IBSG motor (1), and then executes the fourth step;
fourthly, the engine control unit (4) controls the direct current converter DCDC (5) to carry out pre-charging, adjusts the idling speed of the engine and then executes the fifth step;
fifthly, the engine control unit (4) judges whether the voltage in the IBSG motor loop is larger than a preset pre-charging target voltage value and the rotating speed of the IBSG motor is in a set rotating speed range, if so, the sixth step is executed, otherwise, the fifth step is continuously executed;
sixthly, the engine control unit (4) sends a command for requesting the IBSG motor (1) to generate power by taking the set voltage as an output voltage to the IBSG motor (1), and forbids R1、R2、...、RnPerforming on/off switching, and then executing a seventh step;
and seventhly, the engine control unit (4) controls the direct current converter DCDC (5) to convert the output voltage of the IBSG motor (1) and then charge the storage battery (7), and then the operation is finished.
6. The self-generating limp home method of the hybrid electric vehicle according to claim 5, wherein: the set current fluctuation threshold value is a current fluctuation value A which is obtained through bench test simulation and causes the IBSG motor (1) to exit the power generation mode.
7. The self-generating limp home method of the hybrid electric vehicle according to claim 5 or 6, wherein: and obtaining the current fluctuation value of each electric appliance load in the whole vehicle load (6) when the electric appliance load is switched on/off through a whole vehicle load power verification test.
8. The self-generating limp home method of the hybrid electric vehicle according to claim 7, characterized in that: the set pre-charging target voltage value is 45V, the set rotating speed range is 2500-18000 rpm, and the set voltage value range is 38-42V.
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| CN110877607B (en) | 2021-04-06 |
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