CN102545585B - Method for controlling voltage set point of direct-current high-voltage/low-voltage converter - Google Patents

Method for controlling voltage set point of direct-current high-voltage/low-voltage converter Download PDF

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CN102545585B
CN102545585B CN201010608079.8A CN201010608079A CN102545585B CN 102545585 B CN102545585 B CN 102545585B CN 201010608079 A CN201010608079 A CN 201010608079A CN 102545585 B CN102545585 B CN 102545585B
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voltage
state
charge
point
control
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CN102545585A (en
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张君鸿
孟涛
陈森涛
张琳
马成杰
梁海波
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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Abstract

The invention provides a method for controlling a voltage set point of a direct-current high-voltage/low-voltage converter, and belongs to the technical field of hybrid electric vehicles. The control method is used for direct-current high-voltage/low-voltage converters, and is used for setting the voltage set points of the direct-current high-voltage/low-voltage converters based on the charge state of voltage batteries, wherein when the charge state is lower than or equal to a threshold point, the voltage set point falls along with the rising of the charge state; when the charge state is higher than the threshold point, the voltage set point rises along with the rising of the charge state. By utilizing the method, the electricity energy supplied from a high-voltage power battery to a low-voltage battery can be enabled to be in a superior state, and the energy utilization ratio of the high-voltage power battery can be improved.

Description

The control method of the voltage set point of direct current converter
Technical field
The invention belongs to Development of HEV Technology field, relate to a kind of direct current converter, particularly relate to the control method of the voltage set point of direct current converter.
Background technology
Along with the continuous deterioration of global environment and the in short supply of the energy, reducing air pollution and relying on petroleum-based energy becomes the problem more and more paid close attention to various countries.In order to reduce environmental pollution, alleviate Pressure on Energy, the automobile of research energy-saving and environmental protection becomes a kind of inevitable trend of various countries' development auto industry.At present, research and production hybrid vehicle have become the first-selection of various countries' automobile industry.Hybrid vehicle is combined at motor and engine; electric motor starting, regenerative braking, idle stop, intelligent charge, motor power-assisted, the electronic mixed function such as to creep can be realized, its have reduce oil consumption, increase continual mileage, technology maturity compares advantages of higher.
Normally, hybrid electric vehicle comprises two power storage bags: high voltage power battery and A-battery.High voltage power battery normally when mixed motor-car regenerative braking, the electrical power storage that vehicle energy is changed into; A-battery is then used for powering to vehicle-mounted low-voltage load.In order to improve the capacity usage ratio of high voltage power battery, reduce the consumption of vehicle fuel, hybrid electric vehicle generally can adopt a kind of direct current converter (DC-DC Convert) between high voltage power battery network and A-battery network.
Figure 1 shows that power system structure schematic diagram relevant to direct current converter in the hybrid vehicle of prior art.As shown in Figure 1, unnecessary kinetic energy can be converted to electric energy by general mixed dynamic motor (Motor-Generator), this electric energy is after inverter conversion, be stored in high voltage power battery with the form of high direct voltage, direct current converter inputs high voltage direct current from high-tension battery or inverter, then export to A-battery or load with the form of relatively low pressure, voltage request and the A-battery of this output match, to power to A-battery.Simultaneously, HCU (entire car controller) is connected with direct current converter by CAN, and direct current converter can be controlled, such as, control opening or closure state of direct current converter, the voltage set point (Set Point) etc. of regulation and control direct current converter.And the output voltage of direct current converter is normally determined by its voltage set point, therefore need a kind of control method to carry out control voltage set point, thus make high voltage power battery be in more excellent state to the electric energy that A-battery provides.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of control method of voltage set point of direct current converter, is in more excellent state to make high voltage power battery to the electric energy that A-battery provides.
For solving above technical problem, the invention provides a kind of control method of voltage set point of direct current converter, its state-of-charge based on A-battery, setting the voltage set point of direct current converter; Wherein, when described state-of-charge is less than or equal to threshold point, described voltage set point reduces along with the rising of described state-of-charge; When described state-of-charge is greater than described threshold point, described voltage set point is raised along with the rising of described state-of-charge.
According to an embodiment of the control method of body of the present invention, wherein, described voltage set point changes with normal distribution curve or approximate normal distribution curve form with described state-of-charge.Preferably, when described state-of-charge is less than described threshold point, described voltage set point increases with described state-of-charge, its pace of change accelerates gradually; When described state-of-charge is greater than described threshold point, described voltage set point increases with described state-of-charge, its pace of change is slack-off gradually.
According to another embodiment of the control method of body of the present invention, wherein, described voltage set point with described state-of-charge with form of straight lines linear change.
According to another embodiment of the control method of body of the present invention, wherein, described voltage set point changes with parabolic with described state-of-charge.Preferably, when described state-of-charge is less than described threshold point, described voltage set point increases with described state-of-charge, its pace of change is slack-off gradually; When described state-of-charge is greater than described threshold point, described voltage set point increases with described state-of-charge, its pace of change accelerates gradually.
According to an also embodiment of the control method of body of the present invention, wherein, described voltage set point with described state-of-charge with staircase curve variation.
Preferably, described curve or straight line are about the longitudinal linear axis symmetry in described threshold point place.
Preferably, described threshold point can in the scope of 30% to 60% of described state-of-charge.
Preferably, be the battery of 12 volts, 24 volts or 36 volts.
Preferably, the state-of-charge information of described A-battery is collected and be passed to entire car controller, and described entire car controller is connected with direct current high-low voltage transducer by CAN.
Technique effect of the present invention is, by setting the voltage set point of direct current converter based on the state-of-charge change of A-battery, high voltage power battery can be made to be in more excellent state to the electric energy that A-battery provides, and the energy ecology of high voltage power battery can be improved.
Accompanying drawing explanation
Fig. 1 is power system structure schematic diagram relevant to direct current converter in the hybrid vehicle of prior art;
Fig. 2 is the curve synoptic diagram of the control method provided according to first embodiment of the invention;
Fig. 3 is the curve synoptic diagram of the control method provided according to second embodiment of the invention;
Fig. 4 is the curve synoptic diagram of the control method provided according to third embodiment of the invention;
Fig. 5 is the curve synoptic diagram of the control method provided according to fourth embodiment of the invention.
Embodiment
Introduce below be of the present invention multiple may some in embodiment, aim to provide basic understanding of the present invention.Be not intended to confirm key of the present invention or conclusive key element or limit claimed scope.
The control method provided in this invention is for (in the direct current converter such as shown in Fig. 1) in direct current converter, it can be used for setting the voltage set point (Set Point) of direct current converter, to make the output voltage of direct current converter be set in certain point, thus match with A-battery.It should be noted that, mentioned here, it is not be definitely fixed on some points that output voltage is set in certain point, it will be understood by those skilled in the art that (in the margin of tolerance of such as 0.1%) in the margin of tolerance that output voltage can allow in coupling, vibration output near certain point.
The curve synoptic diagram of the control method provided according to first embodiment of the invention is provided.As shown in Figure 2, abscissa represents the state-of-charge (State Of Charge) of A-battery, and ordinate represents the set point of direct current high-low pressure electric pressure converter, and set point take volt as unit.In this embodiment, curve 40 represents the relation schematic diagram of voltage set point and state-of-charge, as shown in Figure 2, based on the change of the state-of-charge of A-battery, when state-of-charge is less than or equal to threshold point, along with the rising of state-of-charge, the voltage set point of converter constantly reduces (as shown by plot 40); When state-of-charge is greater than threshold point, along with the rising of state-of-charge, the voltage set point of converter is constantly raised (as shown in curve 40b).In this embodiment, threshold point is chosen as the state-of-charge of 50% of A-battery, and curve 40a and curve 40b are substantially with threshold point place straight line (parallel with ordinate) axial symmetry.Particularly, for 12 volts of A-batteries, shown in composition graphs 1, relevant information (the electric current of 12 volts of A-batteries, voltage, state-of-charge etc., particularly including state-of-charge) can be collected and be passed to HCU, HCU is according to transmitted state-of-charge signal, the set point of direct current converter is calculated based on the curved line relation shown in Fig. 2, this set point signal transfers to direct current converter by CAN, thus before threshold point, realize the set point reducing (or raising) direct current converter along with the continuous rising (or reduction) of the state-of-charge of A-battery, after threshold point, realize the set point raising (or reduction) direct current converter along with the continuous rising (or reduction) of the state-of-charge of A-battery.
In the embodiment depicted in figure 2, curve 40 is the curve of normal distribution or approximate normal distribution, when state-of-charge is less than threshold point, voltage set point declines comparatively slow when state-of-charge is lower along with state-of-charge change, and it is very fast to decline with the change of state-of-charge when state-of-charge is higher; When state-of-charge is greater than threshold point, voltage set point is raised comparatively fast along with state-of-charge changes when state-of-charge is lower, and raises slower when state-of-charge is higher with the change of state-of-charge.
It should be noted that, in embodiment illustrated in fig. 2, curve 40 illustrate only parabolical variation relation form, but this is not restrictive, can also carrying out control voltage set point according to other curve or form of straight lines and changing with state-of-charge of direct current converter, below will exemplarily be described.
The curve synoptic diagram of the control method provided according to second embodiment of the invention is provided.Shown in Fig. 2, its main distinction is the form difference of curve, in this embodiment, 42 is two rectilinear(-al)s, similarly, threshold point is chosen as the state-of-charge place of 50% of A-battery, and straight line 42a and straight line 42b are substantially with threshold point place straight line (parallel with ordinate) axial symmetry.When A-battery state-of-charge is less than threshold point, voltage set point and state-of-charge change based on straight line 42a, thus make voltage set point linearly reduce (or raising) with the rising (or reduction) of the state-of-charge of low voltage voltage battery; When A-battery state-of-charge is greater than threshold point, voltage set point and state-of-charge change based on straight line 42b, thus voltage set point is linearly raised (or reduction) with the rising (or reduction) of the state-of-charge of low voltage voltage battery.Therefore, in this embodiment, voltage set point is even variation along with the change of state-of-charge.The slope (being also the rate of change of voltage set point) of straight line 42a and 42b does not also limit by the embodiment of the present invention.
The curve synoptic diagram of the control method provided according to third embodiment of the invention is provided.Shown in Fig. 2, its main distinction is the form difference of curve, and in this embodiment, 44 is similar parabolical curve, also namely downwardly towards the parabola type of upper shed.Similarly, threshold point is chosen as the state-of-charge place of 50% of A-battery, parabola 44 is basic with longitudinal straight line (the being parallel to ordinate) axial symmetry at threshold point place, also namely, curve 44a and curve 44b is substantially with longitudinal straight line (the being parallel to ordinate) axial symmetry at threshold point place.When A-battery state-of-charge is less than threshold point, voltage set point and state-of-charge change based on curve 44a, thus make voltage set point linearly reduce (or raising) with the rising (or reduction) of the state-of-charge of low voltage voltage battery, in this example, owing to changing based on parabolic, in curve 44a, voltage set point raises reduction along with state-of-charge change when state-of-charge is lower comparatively slow, and raises reduction with the change of state-of-charge when state-of-charge is higher comparatively fast.When A-battery state-of-charge is greater than threshold point, voltage set point and state-of-charge change based on curve 44b, thus voltage set point is linearly raised (or reduction) with the rising (or reduction) of the state-of-charge of low voltage voltage battery.In this example, due to based on parabolic change, in curve 44b, voltage set point decline along with state-of-charge change when state-of-charge is lower raise comparatively slow, and decline with the change of state-of-charge when state-of-charge is higher raise very fast.It should be noted that, the concrete form of parabola 44 does not also limit by the embodiment of the present invention, raises as long as voltage set point can be made to meet and reduces, raises when state-of-charge is greater than threshold point with state-of-charge and raise when state-of-charge is less than threshold point with state-of-charge.
The curve synoptic diagram of the control method provided according to fourth embodiment of the invention is provided.Shown in Fig. 2, its main distinction is the form difference of curve, and in this embodiment, 46 is the curve of stepped-style, and it is made up of two ends curve 46a and 46b.Similarly, threshold point is chosen as the state-of-charge place of 50% of A-battery, curve 46 is basic with longitudinal straight line (the being parallel to ordinate) axial symmetry at threshold point place, also namely, curve 46a and curve 46b is substantially with longitudinal straight line (the being parallel to ordinate) axial symmetry at threshold point place.When A-battery state-of-charge is less than threshold point, voltage set point and state-of-charge change based on curve 46a, thus voltage set point is progressively reduced (or raising) with the rising (or reduction) of the state-of-charge of low voltage voltage battery.When A-battery state-of-charge is greater than threshold point, voltage set point and state-of-charge change based on curve 46b, thus make voltage set point with the rising (or reduce) of the state-of-charge of low voltage voltage battery lifting step by step (or reduction).Ladder height (height in ordinate direction) size, ladder span (width in the abscissa direction) size of curve 46a and 46b also do not limit by the embodiment of the present invention.As long as voltage set point can be made to meet raise with state-of-charge when state-of-charge is less than threshold point and reduce, raise with state-of-charge when state-of-charge is greater than threshold point and raise.Such as, in same curves, the height of each ladder can be identical, also can be not identical, such as, can decline slow in decline fast, the latter half previous stage.
It should be noted that, the curve of the both sides of the longitudinal straight line in threshold point place not necessarily full symmetric in shape, such as, in other embodiments, the curve on the left side of the longitudinal straight line in threshold point place can be able to be curve 44b embodiment illustrated in fig. 4 or curve 46b embodiment illustrated in fig. 5 for the curve on the curve 40a shown in Fig. 2 and the right; Those skilled in the art can also select the curve of other combining form to carry out the change of control voltage set point according to above enlightenment or instruction.
It should be noted that equally, in above illustrated embodiment, threshold point preferably selects 50% place of the state-of-charge in A-battery.But this is not restrictive, such as, the threshold point of state-of-charge can be selected in the scope of 30% to 60% of the state-of-charge of A-battery.Similarly, the type of A-battery neither be restrictive, and it can 12V, 24V or 36V.
Above example mainly describes control method of the present invention.Although be only described some of them embodiments of the present invention, those of ordinary skill in the art should understand, and the present invention can implement with other forms many not departing from its purport and scope.Therefore, the example shown and execution mode are regarded as illustrative and not restrictive, when do not depart from as appended each claim define the present invention spirit and scope, the present invention may contain various amendments and replacement.

Claims (11)

1. a control method for the voltage set point of direct current converter, is characterized in that, based on A-battery state-of-charge, set the voltage set point of direct current converter; Wherein, when described state-of-charge is less than or equal to threshold point, described voltage set point reduces along with the rising of described state-of-charge; When described state-of-charge is greater than described threshold point, described voltage set point is raised along with the rising of described state-of-charge.
2. control method as claimed in claim 1, is characterized in that, described voltage set point changes with normal distribution curve or approximate normal distribution curve form with described state-of-charge.
3. control method as claimed in claim 2, it is characterized in that, when described state-of-charge is less than described threshold point, described voltage set point increases with described state-of-charge, its pace of change accelerates gradually; When described state-of-charge is greater than described threshold point, described voltage set point increases with described state-of-charge, its pace of change is slack-off gradually.
4. control method as claimed in claim 1, is characterized in that, described voltage set point with described state-of-charge with form of straight lines linear change.
5. control method as claimed in claim 1, it is characterized in that, described voltage set point changes with parabolic with described state-of-charge.
6. control method as claimed in claim 5, is characterized in that, when described state-of-charge is less than described threshold point, described voltage set point increases with described state-of-charge, its pace of change is slack-off gradually; When described state-of-charge is greater than described threshold point, described voltage set point increases with described state-of-charge, its pace of change accelerates gradually.
7. control method as claimed in claim 1, is characterized in that, described voltage set point with described state-of-charge with staircase curve variation.
8. the control method as described in claim 2,4,5 or 7, is characterized in that, described curve or straight line are about the longitudinal linear axis symmetry in described threshold point place.
9. the control method as described in claim 1,2,4,5 or 7, is characterized in that, described threshold point is in the scope of 30% to 60% of described state-of-charge.
10. control method as claimed in claim 1, it is characterized in that, described A-battery is the battery of 12 volts, 24 volts or 36 volts.
11. control methods as claimed in claim 1, is characterized in that, the state-of-charge information of described A-battery is collected and be passed to entire car controller, and described entire car controller is connected with direct current high-low voltage transducer by CAN.
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CN105490330A (en) * 2015-12-15 2016-04-13 苏州贝多环保技术有限公司 Control method for direct-current converter
CN105539172A (en) * 2015-12-15 2016-05-04 苏州贝多环保技术有限公司 Charging and discharging control method for battery of hybrid electric automobile
CN105573144A (en) * 2015-12-15 2016-05-11 苏州贝多环保技术有限公司 Electric quantity control method for hybrid electric automobile
CN105564258A (en) * 2015-12-15 2016-05-11 苏州贝多环保技术有限公司 Control method for electric energy of hybrid electric automobile
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