CN102529734B - Intelligent charge control and finished automobile calibration method for hybrid automobiles - Google Patents

Abstract

The invention relates to an intelligent charge control and finished automobile calibration method for hybrid automobiles. The intelligent charge control and finished automobile calibration method comprises the following steps of: A, dividing and calibrating different charge modes according to a working point of an engine and an automobile operation state; and B, using a hybrid control unit (HCU) to judge the charge mode of an automobile according to the current operation state of the automobile, and setting a charge torque by combining with charge capacities of motors of an SOC (System On Chip) and a BSG (Belt-driven Starter generator), and torque transmission of a front-end wheel system, so as to maximize the entire efficiency of a hybrid system. With the adoption of the intelligent charge control and finished automobile calibration method disclosed by the invention, the entire efficiency of the system is calculated by the hybrid control unit (HCU) in time, so that the charge torque of the motor of the BSG is reasonably controlled. Therefore, the entire efficiency of the hybrid system is optimized, the service life of a high-voltage battery can be prolonged, and the emission and the oil consumption can be reduced.

Description

Hybrid vehicle intelligent charge controls and car load calibration method

[technical field]

The invention belongs to hybrid vehicle control field, particularly relate to a kind of hybrid vehicle intelligent charge and control and car load calibration method.

[background technology]

Day by day exhausted along with Global Oil resource, increasing automobile energy-saving technology has been developed and has dropped into application, and wherein Technology of Hybrid Electric Vehicle receives extensively attention also it becomes one of study hotspot.

Usually, hybrid vehicle is that employing two kinds of propulsions source drive, and high-tension battery wherein can play the effect of stored energy and power-assisted.Thus, when driving according to the operation point of driving engine, can indirectly be regulated the operation point of driving engine by the charging current of active adjustment high-tension battery, thus impel engine operation in the higher region of efficiency.But, the existing charging for hybrid vehicle high-tension battery controls also to there is more deficiency, especially show following three aspect problems: one, fail to take into full account and when charging, the whole efficiency of driving engine and high-tension battery to be optimized, thus it cannot be made to reach optimization; Its two, the charging current under charge mode and each charge mode is not segmented, thus has influence on battery; Its three, do not consider that BSG motor efficiency under little moment of torsion operating mode is very low, be unfavorable for improving automotive operation performance.

Be disclose a kind of method for controlling hybrid vehicle main battery charging and discharging amount in the patent documentation of CN101085604A at Chinese publication number, it checks main battery, drive motor, converting system etc. by adopting hybrid power control unit; Hybrid vehicle is driven according to driving model; Regulate according to driving model and know the proportionality coefficient of main battery, being controlled the charging and discharging amount of main battery by hybrid power control unit, thus by charge condition management in normal region.This inventive method can not solve above-mentioned in the charging control of hybrid vehicle high-tension battery Problems existing.

[summary of the invention]

In view of this, a kind of hybrid vehicle intelligent charge is the object of the present invention is to provide to control and car load calibration method, with according to the operation point of driving engine and other associated power unit informations reasonably control BSG motor charging moment of torsion and realize the optimization of power system whole efficiency, thus effectively can overcome the above-mentioned many drawbacks existed in prior art.

For achieving the above object, the technical solution used in the present invention is as follows:

A kind of hybrid vehicle intelligent charge controls and car load calibration method, and it comprises:

A, divide according to the operation point of driving engine and travel condition of vehicle and demarcate different charge modes; And

B, use hybrid power control unit HCU judge charge mode residing for it according to the current operating conditions of vehicle, and set the charging moment of torsion of BSG motor in conjunction with the charging ability of high-tension battery state-of-charge SOC, BSG motor and the moment of torsion transmission of front end wheel train, maximize to make hybrid power system whole efficiency.

In the control of above-mentioned hybrid vehicle intelligent charge and car load calibration method, preferably, the charge mode in described steps A comprises:

Idling charge mode, it refers to the stabilized conditions electric current of high-tension battery being held in balance under making the state-of-charge SOC of high-tension battery be in optimum working zone, and namely low-voltage load is all that the energy produced by BSG electric power generation makes up with electric consumption;

Regenerative brake charge mode, it refers under the driving operating mode that Das Gaspedal is fully released and Full Vehicle System is in DECEL ENLEAN, drags generating to carry out Some substitute brake system function to be stored in high-tension battery by Brake energy recovery as much as possible by BSG motor is counter; And

Intelligent charge pattern, under it refers to the driving operating mode be operated in Das Gaspedal, is in efficiency upper zone by the operation point regulating the charging moment of torsion of BSG motor to carry out Indirect method driving engine to make it, thus hybrid power system whole efficiency is maximized.

In the control of above-mentioned hybrid vehicle intelligent charge and car load calibration method, preferably, what in described step B, judge residing charge mode judges order successively: whether be in idling charge mode, whether be in regenerative brake charge mode, whether be in intelligent charge pattern.

In the control of above-mentioned hybrid vehicle intelligent charge and car load calibration method, preferably, when judging that residing charge mode is described idling charge mode, the concrete steps setting the charging moment of torsion of BSG motor in described step B comprise:

B11, according to the state-of-charge SOC of high-tension battery calculate setting described charging moment of torsion.

In the control of above-mentioned hybrid vehicle intelligent charge and car load calibration method, preferably, when judging that residing charge mode is described regenerative brake charge mode, the concrete steps setting the charging moment of torsion of BSG motor in described step B comprise:

B21, judge whether to meet and forbid charge condition: if met, be then 0 by described charging torque setting; Otherwise, perform step B22; And

B22, judge whether brake pedal is operated and is greater than default threshold, described default threshold is arranged for and judges that chaufeur exists deceleration intention immediately: if then calculate the described charging moment of torsion of setting according to the first relational expression comprising current vehicle speed and shift signal; Otherwise, just according to comprising current vehicle speed and shift signal and the second relational expression being different from described first relational expression calculates the described charging moment of torsion of setting.

In the control of above-mentioned hybrid vehicle intelligent charge and car load calibration method, preferably, forbid that charge condition is comprise at least one Jie in the group of ABS work, ABS-system fault, power-transfer clutch not locking described in.

In the control of above-mentioned hybrid vehicle intelligent charge and car load calibration method, preferably, when judging that residing charge mode is described intelligent charge pattern, the concrete steps setting the charging moment of torsion of BSG motor in described step B comprise:

The maximal efficiency of the hybrid power system entirety that B31, the moment of torsion that carries out optimizing process to obtain charging with the optimal charge moment of torsion of BSG motor, basis respectively according to following relationship are corresponding and basic efficiency, wherein said optimal charge moment of torsion is the charging moment of torsion of the BSG motor corresponding by the BSGPwIn calculated when hybrid power system whole efficiency is maximum, and described basis charging moment of torsion is by the minimum charging moment of torsion of BSG motor corresponding to the BSGPwIn calculated:

$\mathrm{Totalefficiency}=\frac{\mathrm{EngPwout}-\mathrm{BSGPwIn}+\mathrm{BSGPwIn}\×{\mathrm{\η}}_{\mathrm{BSG}}}{\mathrm{EngPwout}/{\mathrm{\η}}_{\mathrm{eng}}}$

In formula: Totalefficiency is hybrid power system whole efficiency;

EngPwout is the actual output energy of driving engine;

BSGPwIn is the rechargeable energy of BSG motor;

η _bSG, η _engbe respectively the practical efficiency of BSG motor and driving engine;

Whether B32, the difference judging between described maximal efficiency and described basic efficiency are greater than first is preset threshold: if be then the charging moment of torsion of described BSG motor by described optimal charge torque setting; Otherwise, perform step B33; And

Whether B33, the difference judging between described maximal efficiency and described basic efficiency are less than second is preset threshold, wherein said second presets threshold is less than the described first default threshold: if be then the charging moment of torsion of described BSG motor by described basis charging torque setting; Otherwise, be the charging moment of torsion of current BSG motor by the charging torque setting of the BSG motor of previous moment.

Beneficial effect of the present invention is: adopt hybrid vehicle intelligent charge of the present invention to control and car load calibration method, it calculates the whole efficiency of hybrid power system in real time by hybrid power control unit HCU, comprehensively the charging ability of high-tension battery state-of-charge SOC, BSG motor and the moment of torsion of front end wheel train the charging moment of torsion that conservative control BSG motor is carried out in the aspects such as limit value can be transmitted, thus realize the optimization of hybrid power system whole efficiency.Application the present invention can effectively extend high-tension battery service life, promote fuel economy, reduce discharge and reduce pollution to environment.

[accompanying drawing explanation]

Below with reference to drawings and Examples, technical scheme of the present invention is described in further detail.Wherein:

Fig. 1 is the composition schematic diagram of the unified example of hybrid power system involved in the inventive method;

Fig. 2 is the diagram of circuit carrying out charge mode judgement in an example of the inventive method;

Fig. 3 is the diagram of circuit carrying out the control of regenerative brake charge mode in the example of the inventive method;

Fig. 4 is the diagram of circuit carrying out the control of idling charge mode in the example of the inventive method; And

Fig. 5 is the diagram of circuit carrying out intelligent charge Schema control in the example of the inventive method.

[detailed description of the invention]

Generally, the inventive method first segments according to the operation point of driving engine and travel condition of vehicle and demarcate different charge modes, then hybrid power control unit HCU is used specifically to determine the charge mode residing for it according to the current operating conditions of vehicle, and set in conjunction with the charging moment of torsion of aspect information to BSG motor such as the charging ability of high-tension battery state-of-charge SOC, BSG motor and the moment of torsion transmission limit values of front end wheel train, thus ensure the whole efficiency of hybrid power system is realized with being optimised.

Refer to Fig. 1, only illustrate the basic structure composition of the hybrid power system that hybrid vehicle intelligent charge of the present invention controls and relates in car load calibration method in the figure by way of example.As shown in Figure 1, BSG motor is in parallel with driving engine by belt, and the generated energy produced by BSG motor is stored in high-tension battery by inverter, and the power of BSG motor and driving engine is then be delivered on semiaxis and wheel by change speed gear box, thus drives car load.Below by with the example in Fig. 1, and the content of the inventive method is described further combined with other accompanying drawing.

In a preferred embodiment, different charge modes mentioned in aforesaid the inventive method can be embodied as idling charging, regenerative brake charging and these three kinds of hybrid power system charge modes of intelligent charge.Further, the priority judgement order that employing is following is also specifically illustrated in fig. 2: namely, first judge whether to be in idling charge mode; If do not meet idling charge mode, then then judge whether to be in regenerative brake charge mode; If also do not meet regenerative brake charge mode, just judge whether to be in intelligent charge pattern; If all do not meet above charge mode, then terminate and do not carry out charging operations, that carries out charge mode with this chooses judgement.To be specifically described, better the features and advantages of the invention etc. can be understood these three kinds of charge modes above-described below.

For idling charge mode, it refers to when ensureing that the state-of-charge SOC of high-tension battery is in optimum working zone, make the electric current of high-tension battery be held in the stabilized conditions of balance, that is by low-voltage load used be all that the energy produced by BSG electric power generation carries out making up with electric consumption.The discharge and recharge number of times of high-tension battery can be reduced so as much as possible, extend the service life of high-tension battery.

About regenerative brake charge mode, its object to be fully released in Das Gaspedal and under be in the driving operating mode of DECEL ENLEAN in Full Vehicle System, by making, BSG motor is counter to be dragged generating thus partly substitutes brake system function, can be stored in high-tension battery by Brake energy recovery as much as possible.

For intelligent charge pattern, its object is to when Das Gaspedal is stepped on by chaufeur, the operation point indirectly adjusting driving engine by regulating the charging moment of torsion of BSG motor is to make this engine operation in the higher region of efficiency, thus impel the whole efficiency of hybrid power system to be maximized (that is, realizing whole efficiency optimization).

Certainly, the charging moment of torsion of these charge modes all can be subject to the restriction that the charging ability of high-tension battery state-of-charge SOC, BSG motor and automotive front end train moment of torsion transmit above, and the particular content apparatus control process of these three kinds of charge modes is by composition graphs 3,4 and 5 respectively and be described in detail with the example of Fig. 1.

Please refer to Fig. 3, carrying out in regenerative brake charge mode control process, when judgement current be under this charge mode after, namely chaufeur is now Das Gaspedal to be totally released and Full Vehicle System is in the mixed dynamic state of DECEL ENLEAN, then just judge whether further to meet forbid charge condition (such as, ABS work, ABS-system fault, power-transfer clutch not locking etc.) and take following measures:

If meet and forbid charge condition, just the charging moment of torsion of the hybrid electric motor of BSG motor and so in such as Fig. 1 example is forced to be set to 0;

Otherwise, then judge whether to exist brake pedal to be stepped on by chaufeur and it is greater than the situation of a default threshold, this default threshold is arranged for and judges that chaufeur exists deceleration intention (i.e. brake down) immediately by hybrid power control unit HCU: if there is said circumstances, then allow to charge to BSG motor, and the moment of torsion that charges is calculated by the first relational expression Tq_charge=Fun1 (vehicle_speed, gear_position) shown in Figure 3 according to current vehicle speed and shift signal; Certainly, if there is not said circumstances, this just means that hybrid power control unit HCU can judge that chaufeur now actual is intended that coastdown (i.e. coast down), therefore the second relational expression Tq_charge=Fun2 (vehicle_speed also shown in Figure 3, not identical with the first above relational expression will be adopted, gear_position) set phase inductive charging moment of torsion now, be carry out calculating using the current speed of a motor vehicle and shift signal as input parameter in this second relational expression.

Again as shown in Figure 4, this graph shows the treatment scheme when charge mode is idling charge mode, namely being calculate the charging torque T q_charge of setting BSG motor according to the state-of-charge SOC of high-tension battery under this charge mode, is namely represent with relational expression Tq_charge=Fun (HVBatt_SOC) in the diagram.

As previously mentioned, the object of intelligent charge pattern be chaufeur step on the throttle pedal driving operating mode under by regulating the charging moment of torsion of BSG motor to make engine operation in efficiency upper zone to realize entire system efficiency optimization.Moment of torsion according to following driving engine exports demand, the charging torque demand of BSG motor and the relation of car load torque demand:

VehicleRequest_Tq＝EngineRequest_Tq-Tq_charge×k_ratio

In formula: VehicleRequest_Tq is car load torque demand;

EngineRequest_Tq is that the moment of torsion of driving engine exports demand;

Tq_charge is the charging torque demand of BSG motor;

K_ratio is transmitting ratio between BSG motor and driving engine.

As can be seen here, when regulating the charging moment of torsion of BSG motor, the operation point of driving engine must be caused to change.If keep engine speed constant, when the increase along with charging moment of torsion, according to the characteristic performance curve of driving engine, its operation point will on move.Charging moment of torsion due to BSG motor will be subject to the restriction that the charging ability of high-tension battery state-of-charge SOC, BSG motor and front end wheel train moment of torsion transmit, and so namely makes the charging moment of torsion of BSG motor be actually to be in a finite interval.Like this, go out as shown in Figure 5, just can calculate the Tq_charge corresponding by BSGPwIn when hybrid power system whole efficiency is optimum by adopting following optimizing process and be the optimal charge moment of torsion of BSG motor under this operating point.

$\mathrm{Totalefficiency}=\frac{\mathrm{EngPwout}-\mathrm{BSGPwIn}+\mathrm{BSGPwIn}\×{\mathrm{\η}}_{\mathrm{BSG}}}{\mathrm{EngPwout}/{\mathrm{\η}}_{\mathrm{eng}}}$

In formula: Totalefficiency is hybrid power system whole efficiency;

EngPwout is the actual output energy of driving engine;

BSGPwIn is the rechargeable energy of BSG motor;

η _bSG, η _engbe respectively the practical efficiency of BSG motor and driving engine.

Rapid Variable Design is there is along with the change of driving operating mode in order to prevent optimal charge moment of torsion, so need to increase hysteresis process, charge based on the minimum charging moment of torsion being about to BSG motor under this operating point moment of torsion, then using the difference of the basic efficiency eff_base corresponding with the basic moment of torsion that charges of the maximal efficiency eff_best corresponding to optimal charge moment of torsion as the foundation of hysteresis.

As shown in Figure 5, when judging that above-mentioned difference is greater than the first default threshold Threshold1, just BSG motor is charged according to the optimal charge torque T q_charge_best by calculating above;

When judging that above-mentioned difference is not more than the first default threshold Threshold1 and is less than the second default threshold Threshold2 (it is set to be less than first and presets threshold Threshold1), then BSG motor is charged according to the basis charging torque T q_charge_base by calculating above;

Otherwise, just mean that this difference is preset threshold Threshold1 and second between first and preset between threshold Threshold2, now just the charging torque T q_charge_prev of BSG motor according to the BSG motor of previous moment charged.

Be enumerated above some specific embodiments and illustrate hybrid vehicle intelligent charge of the present invention control and car load calibration method in detail, this a few example is only for principle of the present invention and embodiment thereof are described, but not limitation of the present invention, without departing from the spirit and scope of the present invention, those of ordinary skill in the art can also make various distortion and improvement.Therefore all equivalent technical schemes all should belong to category of the present invention also by every claim of the present invention is limited.

Claims (7)

1. hybrid vehicle intelligent charge controls and a car load calibration method, and it is characterized in that, described method comprises:

A, divide according to the operation point of driving engine and travel condition of vehicle and demarcate different charge modes; And

B, use hybrid power control unit HCU judge charge mode residing for it according to the current operating conditions of vehicle, and according to high-tension battery state-of-charge SOC or the charging moment of torsion by setting BSG motor in conjunction with the charging ability of BSG motor and the moment of torsion transmission of front end wheel train, maximize to make hybrid power system whole efficiency.

2. hybrid vehicle intelligent charge according to claim 1 controls and car load calibration method, and it is characterized in that, the charge mode in described steps A comprises:

Idling charge mode, it refers to the stabilized conditions electric current of high-tension battery being held in balance under making the state-of-charge SOC of high-tension battery be in optimum working zone, and namely low-voltage load is all that the energy produced by BSG electric power generation makes up with electric consumption;

Regenerative brake charge mode, it refers under the driving operating mode that Das Gaspedal is fully released and Full Vehicle System is in DECEL ENLEAN, drags generating to carry out Some substitute brake system function to be stored in high-tension battery by Brake energy recovery as much as possible by BSG motor is counter; And

Intelligent charge pattern, under it refers to the driving operating mode be operated in Das Gaspedal, is in efficiency upper zone by the operation point regulating the charging moment of torsion of BSG motor to carry out Indirect method driving engine to make it, thus hybrid power system whole efficiency is maximized.

3. hybrid vehicle intelligent charge according to claim 2 controls and car load calibration method, it is characterized in that, what in described step B, judge residing charge mode judges order successively: whether be in idling charge mode, whether be in regenerative brake charge mode, whether be in intelligent charge pattern.

4. the hybrid vehicle intelligent charge according to Claims 2 or 3 controls and car load calibration method, it is characterized in that, when judging that residing charge mode is described idling charge mode, the concrete steps setting the charging moment of torsion of BSG motor in described step B comprise:

B11, according to the state-of-charge SOC of high-tension battery calculate setting described charging moment of torsion.

5. the hybrid vehicle intelligent charge according to Claims 2 or 3 controls and car load calibration method, it is characterized in that, when judging that residing charge mode is described regenerative brake charge mode, the concrete steps setting the charging moment of torsion of BSG motor in described step B comprise:

B21, judge whether to meet and forbid charge condition: if met, be then 0 by described charging torque setting; Otherwise, perform step B22; And

B22, judge whether brake pedal is operated and is greater than default threshold, described default threshold is arranged for and judges that chaufeur exists deceleration intention immediately: if then calculate the described charging moment of torsion of setting according to the first relational expression comprising current vehicle speed and shift signal; Otherwise, just according to comprising current vehicle speed and shift signal and the second relational expression being different from described first relational expression calculates the described charging moment of torsion of setting.

6. hybrid vehicle intelligent charge according to claim 5 controls and car load calibration method, it is characterized in that, described in forbid that charge condition is comprise at least one in the group of ABS work, ABS-system fault, power-transfer clutch not locking.

7. the hybrid vehicle intelligent charge according to Claims 2 or 3 controls and car load calibration method, it is characterized in that, when judging that residing charge mode is described intelligent charge pattern, the concrete steps setting the charging moment of torsion of BSG motor in described step B comprise:

The maximal efficiency of the hybrid power system entirety that B31, the moment of torsion that carries out optimizing process to obtain charging with the optimal charge moment of torsion of BSG motor, basis respectively according to following relationship are corresponding and basic efficiency, wherein said optimal charge moment of torsion is the charging moment of torsion of the BSG motor corresponding by the BSGPwIn calculated when hybrid power system whole efficiency is maximum, and described basis charging moment of torsion is by the minimum charging moment of torsion of BSG motor corresponding to the BSGPwIn calculated:

$\mathrm{Totalefficiency}=\frac{\mathrm{EngPwout}-\mathrm{BSGPwIn}+\mathrm{BSGPwIn}\×{\mathrm{\η}}_{\mathrm{BSG}}}{\mathrm{EngPwout}/{\mathrm{\η}}_{\mathrm{eng}}}$

In formula: Totalefficiency is hybrid power system whole efficiency;

EngPwout is the actual output energy of driving engine;

BSGPwIn is the rechargeable energy of BSG motor;

η _bSG, η _engbe respectively the practical efficiency of BSG motor and driving engine;

Whether B32, the difference judging between described maximal efficiency and described basic efficiency are greater than first is preset threshold: if be then the charging moment of torsion of described BSG motor by described optimal charge torque setting; Otherwise, perform step B33; And

Whether B33, the difference judging between described maximal efficiency and described basic efficiency are less than second is preset threshold, wherein said second presets threshold is less than the described first default threshold: if be then the charging moment of torsion of described BSG motor by described basis charging torque setting; Otherwise, be the charging moment of torsion of current BSG motor by the charging torque setting of the BSG motor of previous moment.