CN113276830B - Control method of intelligent vehicle-mounted direct current power generation system - Google Patents
Control method of intelligent vehicle-mounted direct current power generation system Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
- B60W20/17—Control strategies specially adapted for achieving a particular effect for noise reduction
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/1415—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle with a generator driven by a prime mover other than the motor of a vehicle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/1446—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle in response to parameters of a 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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine 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
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
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Abstract
The invention provides a control method of an intelligent vehicle-mounted direct current power generation system, which comprises the following steps: and judging a power generation mode, and entering multi-section constant-power generation control or constant-voltage power generation control according to the judged power generation mode, wherein the constant-voltage power generation mode is a brand new control strategy for keeping continuous power generation so that the whole vehicle can still continuously run and be normally used under the special condition that a power battery pack has a fault or does not have the power battery pack, the fuel efficiency of system power generation is kept to be optimal under the multi-section engine constant-rotating-speed control strategy, and the noise sensitivity of the system is reduced to be minimum.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a control method of an intelligent vehicle-mounted direct-current power generation system.
Background
At present, generally, the vehicle-mounted direct current power generation system has the following two control schemes:
the first scheme is as follows: and the vehicle-mounted direct current power generation system performs power following power generation. The generated power follows the power consumption of a driving motor of the whole vehicle, the rotating speed of an engine changes within a certain range along with the generated power, the power required by the vehicle during low-speed running is small, the generated power is small, the power required by the vehicle during high-speed running is large, and the generated power is large, for example, patent document CN111976710A discloses a method for controlling the generated power of a range extender, which comprises the following steps: determining the target power generation power of the range extender at the current time based on the urban working condition road parameters and the driving habit parameters; determining driving intensity according to the generated power of the whole vehicle and the basic generated power generated by the range extender within a first preset time before the current time; determining a power correction value according to the driving intensity; and correcting the target generating power based on the power correction value. That is, the above patent document is to determine a power correction value according to the driving strength, that is, to correct the power according to the demand of low speed or high speed so that the generated power frequently changes.
Scheme II: the vehicle-mounted direct-current power generation system performs single constant-power generation, and the engine works at the working point with the optimal power generation efficiency (high rotating speed and high fuel efficiency). When the power consumed by the driving motor is larger than the generated power, the insufficient part is provided by the battery, and when the power consumed by the driving motor is smaller than the generated power, the redundant part charges the battery.
However, both the first and second solutions have disadvantages and need to be improved, specifically:
one disadvantage and deficiency of the solution:
the power generation power of the vehicle is frequently changed in the running process, and particularly in the low-speed running process, the rotating speed of an engine is low in power, the engine cannot run under the optimal working condition, the fuel consumption rate is high, and the emission is high.
The peak power of the engine is high, the required displacement is large, and therefore the engine is large in size and the system cost is high. The power following power generation requires that the generated power follows and meets the maximum consumed power of the whole vehicle, so that the peak power of the power generation system is high.
The second scheme has the following defects:
the engine speed is fixed to run at a higher speed, and the influence of the engine noise is larger in the low-speed running process of the vehicle.
In the low-speed driving process, the driving power requirement is small, and the generating electric energy with high power needs to be stored and charged into the battery. Because the high-power charging/discharging efficiency of the battery is lower, the fuel efficiency of the whole vehicle is reduced.
When the battery fails or the buffer capacity of the battery is lost due to some reason during the running process of the vehicle, the constant power generation cannot be carried out, and the vehicle cannot continue to run.
Disclosure of Invention
In order to solve the technical problems, the invention provides a control method of an intelligent vehicle-mounted direct current power generation system, which limits the power generation power in multiple sections according to different vehicle speeds (a plurality of engine rotating speed working points are set, each engine rotating speed point corresponds to one power generation power), controls the engine to operate at the optimal fuel efficiency point as far as possible at each section of rotating speed, and simultaneously enables the high engine rotating speed and the high power to be adopted for power generation at the high vehicle speed and the low engine rotating speed and the low power to be adopted for power generation at the low vehicle speed, thereby effectively managing the noise sensitivity. On the other hand, in order to ensure that the system can work normally when the battery pack is in fault or the buffering capacity of the battery is lost, a function of dynamically identifying the working state of the battery pack and a constant-voltage power generation control mode are added. When the battery pack works normally, a multi-stage power generation control mode (multi-stage constant power generation mode) is adopted; when the battery fault is identified, the constant voltage power generation mode is automatically entered, the power can be continuously supplied to the whole vehicle driving system, the vehicle can be ensured to continue running, and the problem that the vehicle cannot run normally due to the power battery fault in the running process of the vehicle is solved.
The specific technical scheme is as follows: on one hand, the control method of the intelligent vehicle-mounted direct current power generation system comprises multi-section constant power generation control, and the multi-section constant power generation control method comprises the following steps:
determining a target power generation power level and a target engine speed level;
determining a target generating current: calculating the current target generating current in real time according to the determined target generating power and the current bus voltage;
determination of target excitation current: performing PID regulation calculation according to the determined target generating current and the actual generating current, wherein PID output is the target exciting current;
determination of the duty ratio of the PWM control of the exciting current:
carrying out PID regulation calculation according to the determined target exciting current and the actual exciting current, wherein PID output is PWM control duty ratio;
and the MCU adjusts the PWM control register according to the PWM duty ratio value and outputs a corresponding PWM wave.
Preferably, the current maximum generated power is determined according to the current vehicle speed, and the final generated power is determined according to the current power consumption condition, so that the target generated power level and the target engine rotating speed level are determined.
Preferably, the target generated power grade and the target engine rotating speed grade are divided into three grades, and the generated power is divided into rated generated power, economic generated power and low-power generated power; the target rotating speed of the engine is divided into rated power generating rotating speed, economic power generating rotating speed and low power generating rotating speed,
when the target power generation power is determined to be the rated power generation power, the target engine rotating speed is determined to be the rated power generation rotating speed, the target power generation power is determined to be the economic power generation power, the target engine rotating speed is determined to be the economic power generation rotating speed or the target power generation power is determined to be the low power generation power, and the target engine rotating speed is determined to be the low power generation rotating speed, the current target power generation current is calculated according to the target power generation power and the current bus voltage.
Preferably, the method for determining the target generated power being the rated generated power and the target engine speed being the rated power generating speed, the target generated power being the economic generated power and the target engine speed being the economic power generating speed or the target generated power being the low power generating power and the target engine speed being the low power generating speed comprises: the method comprises the following steps:
judging whether the current vehicle speed is greater than the low-power generation vehicle speed, if so, judging whether the current vehicle speed is greater than the economic power generation vehicle speed, and if not, determining that the target power generation power is the low-power generation power and the target engine speed is the low-power generation speed;
if the current vehicle speed is greater than the economic power generating vehicle speed, continuously judging whether the current vehicle speed is greater than the rated power generating vehicle speed, if so, judging whether the current power consumption is greater than the rated power generating index, and if so, determining that the target generating power is the rated generating power and the target rotating speed of the engine is the rated power generating rotating speed;
if the current power consumption is not greater than the rated power generation index, judging whether the current power consumption is greater than the economic power generation index, and if the current power consumption is not greater than the economic power generation index, determining that the target power generation power is small power generation power and the target rotating speed of the engine is small power generation rotating speed;
if the current power consumption is larger than the economic power generation index, determining that the target power generation power is the economic power generation power and the target rotating speed of the engine is the economic power generation rotating speed;
if the current vehicle speed is not greater than the rated power generating vehicle speed, judging whether the current power consumption is greater than the economic power generating index, if the current power consumption is not greater than the economic power generating index, determining that the target power generation power is the low-power generation power and the target engine rotating speed is the low-power generation rotating speed, and if the current power consumption is greater than the economic power generating index, determining that the target power generation power is the economic power generation power and the target engine rotating speed is the economic power generation rotating speed.
On the other hand, the invention provides a control method of an intelligent vehicle-mounted direct-current power generation system, which comprises constant-voltage power generation control, wherein the constant-voltage power generation control method comprises the following steps:
determining a target power generation voltage;
determining a generated power limit value;
determining the maximum limit generating current:
calculating the maximum limiting current in real time according to the determined allowable generating power and the current actual bus voltage;
determining a target exciting current;
calculating the duty ratio of the PWM control of the exciting current:
carrying out PID regulation calculation according to the determined target exciting current and the actual exciting current, wherein PID output is PWM control duty ratio;
and the MCU adjusts the PWM control register according to the PWM duty ratio value and outputs a corresponding PWM wave.
Preferably, when the target excitation current is determined, when the present generated current does not exceed the maximum limit generated current,
carrying out PID regulation calculation according to the determined target generating voltage and the actual generating voltage, wherein PID output is target exciting current;
otherwise, the target exciting current is not adjusted and keeps the original value.
Preferably, the step of determining the generated power limit value is to determine a maximum allowable generated power level according to the current vehicle speed, and then determine a current actually allowable generated power level and an engine speed level according to the current power consumption condition.
Preferably, the target generated voltage is a preset generated voltage value or a generated target voltage dynamically provided by the vehicle control unit VCU.
On the other hand, the invention provides a control method of an intelligent vehicle-mounted direct-current power generation system, which comprises the following steps:
judging a power generation mode;
and entering the multi-stage constant power generation control or the constant voltage generation control according to the judged power generation mode.
Preferably, the judging of the power generation mode includes the steps of:
judging whether the communication of the battery can is normal or not, if not, continuously judging whether the bus voltage is normal or not, and if not, entering a constant voltage power generation mode; otherwise, entering a multi-section constant power generation mode;
if the communication of the battery pack can is normal, judging whether the main contactor is closed, and if the main contactor is not closed, entering a constant-voltage power generation mode; and if the main contactor is closed, judging whether the main negative contactor is closed, if the main negative contactor is not closed, entering a constant-voltage power generation mode, otherwise, entering a multi-section constant-power generation mode.
The multi-section constant power generation mode provided by the invention specifically comprises the following steps:
(1) firstly, the target generating power required by each section is determined on the basis of the actual power consumption power of the whole vehicle at different speeds.
(2) Secondly, the generated power is limited in multiple stages according to a plurality of preset vehicle speeds (different vehicles can have the same or different vehicle speeds), for example, the generated power can be limited to rated power, economic power and silent power and corresponds to three constant-speed operating points of the high engine, the medium engine and the low engine.
(3) The arrangement of the constant power of each stage of power generation and the constant rotating speed of the engine needs to ensure that the fuel efficiency of the engine is kept at the edge of a high-efficiency area or the high-efficiency area, and the purpose of managing the working noise sensitivity of a power generation system is achieved.
(4) When the vehicle speed is lower than the next stage target vehicle speed, the power generation constant power limiting value is reduced to the next stage power target, and meanwhile, the constant rotating speed of the engine is reduced to the next stage lower rotating speed, so that the noise sensitivity of the engine is reduced.
(5) When the vehicle speed is higher than the target vehicle speed in the previous stage, the power generation constant power limiting value is increased to the power target in the previous stage, and meanwhile, the constant rotating speed of the engine is also increased to the higher rotating speed in the previous stage.
(6) At each stage of vehicle speed, when the actual power consumption is lower (such as lightly stepping on an accelerator, sliding and the like), the one-stage or multi-stage power generation power can be dynamically reduced according to the power consumption condition, and meanwhile, the constant rotating speed of the engine is also reduced to the corresponding rotating speed.
The constant-voltage power generation mode provided by the invention specifically comprises the following steps:
the control target of the constant voltage power generation is to keep the direct current power generation voltage of the system stable in a given target voltage range and realize the stability of the direct current power generation voltage by adjusting the exciting current. In the power generation control mode, the system does not need a power battery for buffering, and can quickly track the change of power consumption.
(1) Dynamic identification of power battery faults
Adopt two kinds of judgement conditions, dynamic monitoring power battery's operating condition includes:
and under the condition that the power battery works normally (the CAN of the BMS communicates normally), monitoring the state of a contactor of the power battery pack. When the positive contactor and the negative contactor of the power battery pack are abnormally disconnected, the system enters a constant-voltage power generation mode;
when the power battery does not work (CAN communication without BMS), the direct current bus voltage of the system is monitored. When the voltage is lower than the lowest voltage of the battery pack, the system enters a constant-voltage power generation mode.
(2) Constant voltage power generation control target
After the constant voltage power generation mode is entered, the generator system immediately takes a power generation voltage value preset by the system or a power generation target voltage dynamically provided by a VCU (vehicle control unit) as a regulation target voltage to carry out continuous uninterrupted power generation, and continuous power supply is provided for the whole vehicle while voltage stability is ensured.
(3) Power generation control strategy
The battery pack fault or the battery pack-free condition is that the electric vehicle can only appear under the extreme condition, and the main purpose of the constant voltage control is to ensure the continuous power supply and the continuous driving capability of the whole vehicle.
Under the constant-pressure power generation mode, the power generation power is limited in multiple sections according to different vehicle speeds, the engine is controlled to operate at the optimal fuel efficiency point as far as possible at each section of rotating speed, and the noise sensitivity is effectively managed;
under the multi-section engine constant rotating speed control strategy, the actual generated power of the generator is continuously changed downwards within the power limit range of each section.
When the vehicle speed is lower than the next stage target vehicle speed, the power generation constant power limiting value is reduced to the next stage power target, and meanwhile, the constant rotating speed of the engine is reduced to the next stage lower rotating speed, so that the noise sensitivity of the engine is reduced.
When the vehicle speed is higher than the target vehicle speed in the previous stage, the power generation constant power limiting value is increased to the power target in the previous stage, and meanwhile, the constant rotating speed of the engine is also increased to the higher rotating speed in the previous stage.
Compared with the prior art, the invention has the beneficial effects that:
(1) the multi-section constant power generation mode provided by the invention dynamically optimizes and balances the requirements of the whole vehicle power generation power, the power generation fuel efficiency and the engine noise sensitivity, and optimizes the power generation fuel efficiency and reduces the noise sensitivity to the maximum extent on the premise of meeting the power generation power requirement.
(2) The constant-voltage power generation mode provided by the invention is a brand new control strategy which keeps continuous power generation under the special condition that a power battery pack is in failure or does not have the power battery pack, so that the whole vehicle can still continuously run and be normally used, the fuel efficiency of system power generation is kept to be optimal under the multi-stage engine constant rotating speed control strategy, and the noise sensitivity of the system is reduced to the lowest.
(3) The invention determines the current maximum generating power according to the current vehicle speed, and then determines the final generating power according to the current power consumption condition, thereby determining the target generating power grade and the engine target rotating speed grade, limiting the generating power in multiple sections according to different vehicle speeds (a plurality of engine rotating speed working points are set, and each engine rotating speed point corresponds to one generating power), controlling the engine to operate at the optimal fuel efficiency point as far as possible at each section of rotating speed, simultaneously enabling the high engine rotating speed and the high power to generate power at the high vehicle speed, and adopting the low engine rotating speed and the low power to generate power at the low vehicle speed, and effectively managing the noise sensitivity.
(4) The invention adds the function of dynamically identifying the working state of the battery pack and the constant-voltage power generation control mode to ensure that the system can work normally when the battery pack breaks down or loses the buffer capacity of the battery. When the battery pack works normally, a multi-stage power generation control mode (multi-stage constant power generation mode) is adopted; when the battery fault is identified, the constant voltage power generation mode is automatically entered, the power can be continuously supplied to the whole vehicle driving system, the vehicle can be ensured to continue running, and the problem that the vehicle cannot run normally due to the power battery fault in the running process of the vehicle is solved.
Drawings
FIG. 1 is a flow chart of the power generation mode determination provided by the present invention;
FIG. 2 is a flow diagram of the power generation control provided by the present invention;
FIG. 3 is a flow chart of the calculation of the target generated current and the limiting current according to the present invention;
FIG. 4 is a control flow diagram of the constant voltage power generation provided by the present invention;
fig. 5 is a flow chart of the constant power generation control provided by the present invention.
Detailed Description
Example 1:
as shown in fig. 5, the present embodiment provides a control method for an intelligent vehicle-mounted dc power generation system, which is specifically a multi-stage constant power generation control method, where the multi-stage constant power generation control method includes the following steps:
determining a target power generation level and an engine target rotating speed level:
and determining the current maximum generated power according to the current vehicle speed, and determining the final generated power according to the current power consumption condition so as to determine the target generated power grade and the target engine rotating speed grade.
Determining a target generating current: calculating the current target generating current in real time according to the determined target generating power and the current bus voltage;
determination of target excitation current: performing PID regulation calculation according to the determined target generating current and the actual generating current, wherein PID output is the target exciting current;
determination of the duty ratio of the PWM control of the exciting current:
carrying out PID regulation calculation according to the determined target exciting current and the actual exciting current, wherein PID output is PWM control duty ratio;
and the MCU adjusts the PWM control register according to the PWM duty ratio value and outputs a corresponding PWM wave.
As shown in fig. 3, specifically, the target generated power level and the engine target rotational speed level provided in the present embodiment are divided into three levels, and the generated power is divided into a rated generated power, an economic generated power, and a small-power generated power; the target rotating speed of the engine is divided into a rated power generating rotating speed, an economic power generating rotating speed and a low power generating rotating speed;
when the target power generation power is determined to be the rated power generation power, the target engine rotating speed is determined to be the rated power generation rotating speed, the target power generation power is determined to be the economic power generation power, the target engine rotating speed is determined to be the economic power generation rotating speed or the target power generation power is determined to be the low power generation power, and the target engine rotating speed is determined to be the low power generation rotating speed, the current target power generation current is calculated according to the target power generation power and the current bus voltage.
The method for determining the target power generation power as the rated power generation power, the target engine rotating speed as the rated power generation rotating speed, the target power generation power as the economic power generation power, the target engine rotating speed as the economic power generation rotating speed or the target power generation power as the low power generation power, and the target engine rotating speed as the low power generation rotating speed is as follows: the method comprises the following steps:
judging whether the current vehicle speed is greater than the low-power generation vehicle speed, if so, judging whether the current vehicle speed is greater than the economic power generation vehicle speed, and if not, determining that the target power generation power is the low-power generation power and the target engine speed is the low-power generation speed;
if the current vehicle speed is greater than the economic power generating vehicle speed, continuously judging whether the current vehicle speed is greater than the rated power generating vehicle speed, if so, judging whether the current power consumption is greater than the rated power generating index, and if so, determining that the target generating power is the rated generating power and the target rotating speed of the engine is the rated power generating rotating speed;
if the current power consumption is not greater than the rated power generation index, judging whether the current power consumption is greater than the economic power generation index, and if the current power consumption is not greater than the economic power generation index, determining that the target power generation power is small power generation power and the target rotating speed of the engine is small power generation rotating speed;
if the current power consumption is larger than the economic power generation index, determining that the target power generation power is the economic power generation power and the target rotating speed of the engine is the economic power generation rotating speed;
if the current vehicle speed is not greater than the rated power generating vehicle speed, judging whether the current power consumption is greater than the economic power generating index, if the current power consumption is not greater than the economic power generating index, determining that the target power generation power is the low-power generation power and the target engine rotating speed is the low-power generation rotating speed, and if the current power consumption is greater than the economic power generating index, determining that the target power generation power is the economic power generation power and the target engine rotating speed is the economic power generation rotating speed.
Example 2:
as shown in fig. 4, the present embodiment provides a control method for an intelligent vehicle-mounted dc power generation system, specifically a constant voltage power generation control method, including the following steps:
determining a target power generation voltage:
after the constant voltage power generation mode is entered, the generator system immediately takes a power generation voltage value preset by the system or a power generation target voltage dynamically provided by a VCU (vehicle control unit) as a regulation target voltage to carry out continuous uninterrupted power generation, and continuous power supply is provided for the whole vehicle while voltage stability is ensured.
Determining a generated power limit value:
determining the limit value of the generated power, namely determining the maximum allowable generated power grade according to the current vehicle speed, and then determining the current actually allowable generated power grade and the engine speed grade according to the current power consumption condition;
determining the maximum limit generating current:
calculating the maximum limiting current in real time according to the determined allowable generating power and the current actual bus voltage;
determination of target excitation current:
when the current generating current does not exceed the maximum limit generating current, carrying out PID regulation calculation according to the determined target generating voltage and the actual generating voltage, wherein PID output is the target exciting current;
otherwise, the target exciting current is not adjusted and keeps the original value.
Calculating the duty ratio of the PWM control of the exciting current:
carrying out PID regulation calculation according to the determined target exciting current and the actual exciting current, wherein PID output is PWM control duty ratio;
and the MCU adjusts the PWM control register according to the PWM duty ratio value and outputs a corresponding PWM wave.
As shown in fig. 3, specifically, the target generated power level and the engine target rotational speed level provided in the present embodiment are divided into three levels, and the generated power is divided into a rated generated power, an economic generated power, and a small-power generated power; the target rotating speed of the engine is divided into a rated power generating rotating speed, an economic power generating rotating speed and a low power generating rotating speed;
when the target power generation power is determined to be the rated power generation power, the target engine rotating speed is determined to be the rated power generation rotating speed, the target power generation power is determined to be the economic power generation power, the target engine rotating speed is determined to be the economic power generation rotating speed or the target power generation power is determined to be the low power generation power, and the target engine rotating speed is determined to be the low power generation rotating speed, the current target power generation current is calculated according to the target power generation power and the current bus voltage.
The method for determining the target power generation power as the rated power generation power, the target engine rotating speed as the rated power generation rotating speed, the target power generation power as the economic power generation power, the target engine rotating speed as the economic power generation rotating speed or the target power generation power as the low power generation power, and the target engine rotating speed as the low power generation rotating speed is as follows: the method comprises the following steps:
judging whether the current vehicle speed is greater than the low-power generation vehicle speed, if so, judging whether the current vehicle speed is greater than the economic power generation vehicle speed, and if not, determining that the target power generation power is the low-power generation power and the target engine speed is the low-power generation speed;
if the current vehicle speed is greater than the economic power generating vehicle speed, continuously judging whether the current vehicle speed is greater than the rated power generating vehicle speed, if so, judging whether the current power consumption is greater than the rated power generating index, and if so, determining that the target generating power is the rated generating power and the target rotating speed of the engine is the rated power generating rotating speed;
if the current power consumption is not greater than the rated power generation index, judging whether the current power consumption is greater than the economic power generation index, and if the current power consumption is not greater than the economic power generation index, determining that the target power generation power is small power generation power and the target rotating speed of the engine is small power generation rotating speed;
if the current power consumption is larger than the economic power generation index, determining that the target power generation power is the economic power generation power and the target rotating speed of the engine is the economic power generation rotating speed;
if the current vehicle speed is not greater than the rated power generating vehicle speed, judging whether the current power consumption is greater than the economic power generating index, if the current power consumption is not greater than the economic power generating index, determining that the target power generation power is the low-power generation power and the target engine rotating speed is the low-power generation rotating speed, and if the current power consumption is greater than the economic power generating index, determining that the target power generation power is the economic power generation power and the target engine rotating speed is the economic power generation rotating speed.
Example 3:
as shown in fig. 1 to 5, the present embodiment provides a method for controlling an intelligent vehicle-mounted dc power generation system, including the following steps:
judging a power generation mode;
entering the multi-stage constant power generation control method or the constant voltage generation control method according to the determined power generation mode, wherein the determining the power generation mode provided in the present embodiment includes the following steps:
specifically, whether the communication of the battery can is normal is judged, if the communication of the battery can is abnormal, whether the bus voltage is normal is continuously judged, and if the bus voltage is abnormal, a constant voltage power generation mode is entered; otherwise, entering a multi-section constant power generation mode;
if the communication of the battery pack can is normal, judging whether the main contactor is closed, and if the main contactor is not closed, entering a constant-voltage power generation mode; and if the main contactor is closed, judging whether the main negative contactor is closed, if the main negative contactor is not closed, entering a constant-voltage power generation mode, otherwise, entering a multi-section constant-power generation mode.
The invention provides a control method of an intelligent vehicle-mounted direct current power generation system, which limits power generation power in multiple sections according to different vehicle speeds (a plurality of engine rotating speed working points are set, each engine rotating speed point corresponds to one power generation power), controls an engine to operate at the best fuel efficiency point at each section of rotating speed as far as possible, and meanwhile enables the engine to generate power at high rotating speed and high power at high vehicle speed and generate power at low rotating speed and low power at low vehicle speed, thereby effectively managing the noise sensitivity. On the other hand, in order to ensure that the system can work normally when the battery pack is in fault or the buffering capacity of the battery is lost, a function of dynamically identifying the working state of the battery pack and a constant-voltage power generation control mode are added. When the battery pack works normally, a multi-stage power generation control mode (multi-stage constant power generation mode) is adopted; when the battery fault is identified, the constant voltage power generation mode is automatically entered, the power can be continuously supplied to the whole vehicle driving system, the vehicle can be ensured to continue running, and the problem that the vehicle cannot run normally due to the power battery fault in the running process of the vehicle is solved.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.
Claims (10)
1. A control method of an intelligent vehicle-mounted direct current power generation system is characterized by comprising multi-section constant power generation control, and the multi-section constant power generation control method comprises the following steps: determining a target power generation power level and a target engine speed level; determining a target generating current: calculating the current target generating current in real time according to the determined target generating power and the current bus voltage; determination of target excitation current: performing PID regulation calculation according to the determined target generating current and the actual generating current, wherein PID output is the target exciting current; determination of the duty ratio of the PWM control of the exciting current: carrying out PID regulation calculation according to the determined target exciting current and the actual exciting current, wherein PID output is PWM control duty ratio; and the MCU adjusts the PWM control register according to the PWM duty ratio value and outputs a corresponding PWM wave.
2. The method for controlling an intelligent vehicle-mounted direct-current power generation system according to claim 1, wherein the current maximum generated power is determined according to the current vehicle speed, and the final generated power is determined according to the current power consumption condition, so that the target generated power level and the target engine speed level are determined.
3. The intelligent vehicle-mounted direct-current power generation system control method according to claim 2, wherein the target generated power level and the engine target speed level are divided into three levels, and the generated power is divided into rated generated power, economic generated power and low-power generated power; and when the target generating power is determined to be the rated generating power, the target generating power is the economic generating power, the target rotating speed is the economic generating power, the target generating power is the low-power generating power, and the target rotating speed is the low-power generating speed, the current target generating current is calculated according to the target generating power and the current bus voltage.
4. The intelligent vehicle-mounted direct-current power generation system control method according to claim 3, wherein the method for determining the target generated power which is the rated generated power and the target engine speed which is the rated power generating speed, the target generated power which is the economic generated power and the target engine speed which is the economic power generating speed or the target generated power which is the low power generating power and the target engine speed which is the low power generating speed comprises the following steps: the method comprises the following steps: judging whether the current vehicle speed is greater than the low-power generation vehicle speed, if so, judging whether the current vehicle speed is greater than the economic power generation vehicle speed, and if not, determining that the target power generation power is the low-power generation power and the target engine speed is the low-power generation speed; if the current vehicle speed is greater than the economic power generating vehicle speed, continuously judging whether the current vehicle speed is greater than the rated power generating vehicle speed, if so, judging whether the current power consumption is greater than the rated power generating index, and if so, determining that the target generating power is the rated generating power and the target rotating speed of the engine is the rated power generating rotating speed; if the current power consumption is not greater than the rated power generation index, judging whether the current power consumption is greater than the economic power generation index, and if the current power consumption is not greater than the economic power generation index, determining that the target power generation power is small power generation power and the target rotating speed of the engine is small power generation rotating speed; if the current power consumption is larger than the economic power generation index, determining that the target power generation power is the economic power generation power and the target rotating speed of the engine is the economic power generation rotating speed; if the current vehicle speed is not greater than the rated power generating vehicle speed, judging whether the current power consumption is greater than the economic power generating index, if the current power consumption is not greater than the economic power generating index, determining that the target power generation power is the low-power generation power and the target engine rotating speed is the low-power generation rotating speed, and if the current power consumption is greater than the economic power generating index, determining that the target power generation power is the economic power generation power and the target engine rotating speed is the economic power generation rotating speed.
5. The control method of the intelligent vehicle-mounted direct current power generation system is characterized by comprising constant voltage power generation control, and the constant voltage power generation control method comprises the following steps: determining a target power generation voltage; determining a generated power limit value; determining the maximum limit generating current: calculating the maximum limit generating current in real time according to the determined allowable generating power and the current actual bus voltage; determining a target exciting current; calculating the duty ratio of the PWM control of the exciting current: carrying out PID regulation calculation according to the determined target exciting current and the actual exciting current, wherein PID output is PWM control duty ratio; and the MCU adjusts the PWM control register according to the PWM duty ratio value and outputs a corresponding PWM wave.
6. The intelligent vehicle-mounted direct-current power generation system control method according to claim 5, characterized in that when the target exciting current is determined, and when the current generated current does not exceed the maximum limit generated current, PID adjustment calculation is performed according to the determined target generated voltage and the actual generated voltage, and the PID output is the target exciting current; otherwise, the target exciting current is not adjusted and keeps the original value.
7. The method for controlling an intelligent vehicle-mounted direct-current power generation system according to claim 5, wherein the step of determining the generated power limit value is to determine a maximum allowable generated power level according to the current vehicle speed, and then determine a current actually allowable generated power level and an engine speed level according to the current power consumption condition.
8. The method for controlling the intelligent vehicle-mounted direct-current power generation system according to claim 5, wherein the target power generation voltage is a preset power generation voltage value or a power generation target voltage dynamically provided by a Vehicle Control Unit (VCU).
9. A control method of an intelligent vehicle-mounted direct current power generation system is characterized by comprising the following steps: judging a power generation mode; the multi-stage constant power generation control according to any one of claims 1 to 4 or the constant voltage generation control according to any one of claims 5 to 8 is entered in accordance with the judged power generation mode.
10. The intelligent vehicle-mounted direct-current power generation system control method according to claim 9, wherein the step of judging the power generation mode comprises the following steps: judging whether the communication of the battery can is normal or not, if not, continuously judging whether the bus voltage is normal or not, and if not, entering a constant voltage power generation mode; otherwise, entering a multi-section constant power generation mode; if the communication of the battery pack can is normal, judging whether the main contactor is closed, and if the main contactor is not closed, entering a constant-voltage power generation mode; and if the main contactor is closed, judging whether the main negative contactor is closed, if the main negative contactor is not closed, entering a constant-voltage power generation mode, otherwise, entering a multi-section constant-power generation mode.
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