CN103158695A - Control method of hybrid power vehicle power distribution - Google Patents
Control method of hybrid power vehicle power distribution Download PDFInfo
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- CN103158695A CN103158695A CN201110425006XA CN201110425006A CN103158695A CN 103158695 A CN103158695 A CN 103158695A CN 201110425006X A CN201110425006X A CN 201110425006XA CN 201110425006 A CN201110425006 A CN 201110425006A CN 103158695 A CN103158695 A CN 103158695A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The invention provides a control method of hybrid power vehicle power distribution. The control method comprises the following steps: detecting a battery charge state and requirement torque parameters of a hybrid power vehicle, and changing power distribution modes of the hybrid power vehicle by a finished automobile comprehensive controller of the hybrid power vehicle among a pure power-driven mode, a hybrid power mode and a pure engine mode according to the parameters, wherein the hybrid power mode comprises a form a motor to an engine mode and a motor auxiliary mode, and in the motor auxiliary mode, an engine of the hybrid power vehicle is a main power source and a motor of the hybrid power vehicle is an auxiliary power source. According to the control method, in the motor auxiliary mode, the engine is controlled to be the main power source and the motor is controlled to be the auxiliary power source, so impacts on vehicles caused by the auxiliary power source frequently entering power input are weakened effectively, and driving comfort of the hybrid power vehicle is optimized.
Description
Technical field
The invention belongs to the Development of HEV Technology field, particularly relate to the control method that hybrid electric vehicle power distributes.
Background technology
Along with the high speed development of global economy, the energy and environmental problem become increasingly conspicuous, and energy savings, protection of the environment have become the significant challenge of countries in the world facing.Worldwide low-carbon economy policy has promoted the development of new-energy automobile, and new-energy automobile technological advance, industrialization and application will drive its upstream and downstream industry development, brings basic change for the mankind's traffic and trip.As one can reduce effectively that energy source of car consumes the new-energy automobile technology---Development of HEV Technology has become countries in the world government, one of focus that enterprise and scientific research institution converge.Oil-electric vehicle combines motor and driving engine; realized rational energy saving and emission reduction effects for each operating mode; idle stop, electric motor starting, intelligent charge, regenerative brake, motor power-assisted, the electronic mixed moving function such as creep; have that oil consumption is low, continual mileage is long, technology maturity advantages of higher relatively, is the first-selected trend of each large car company development at present.
Oil-electric vehicle of the prior art comprises electric machine controller, motor, regime clutch, engine petrol, engine management system, hybrid power whole vehicle controller, power battery pack, charger, battery management system, fuel tank, display terminal and Automatic Transmission.Wherein, driving engine and motor are two propulsions source; Regime clutch is used for the joint between two propulsion source driving engines and motor; Hybrid power whole vehicle controller (HCU) is the core that car load is controlled, be used for controlling the coordination of coordinating between engine management system (EMS) and electric machine controller (MCU), and both coordinate with the moment of torsion of Automatic Transmission (AMT) control system (TCU), with driving performance and the energy optimization of realizing that vehicle is good.
Power distribution is as one of gordian technique of field of hybrid electric vehicles, and it is also making constant progress.As main power, and driving engine is got involved power output to the conventional hybrid power vehicle when motor power is not enough as auxiliary power source with the power battery pack translator.When driving engine is got involved power output as auxiliary power, be far longer than the rotor inertia of motor due to the rotor inertia of driving engine, so driving engine frequently the intervention meeting vehicle is caused very large impact, greatly reduced the traveling comfort that hybrid vehicle is driven.
Summary of the invention
The present invention is intended to one of solve the problems of the technologies described above at least.
For this reason, one object of the present invention is to propose a kind of control method that the high hybrid electric vehicle power of driver comfort distributes that has.
Control method according to a kind of hybrid electric vehicle power of the embodiment of the present invention distributes comprises the following steps: the battery charge state and the demand torque parameter that detect described hybrid vehicle; And switch the power distribution mode of described hybrid vehicle according to described parameter by the car load general controller of described hybrid vehicle between electric-only mode, hybrid mode and pure engine mode, wherein said hybrid mode comprises motor transitional to engine mode and motor assist pattern, at the driving engine of hybrid vehicle described in described motor assist pattern as the motor of main power and described hybrid vehicle as auxiliary power source.
Thus, pass through in the motor assist pattern according to the control method that hybrid electric vehicle power of the present invention distributes, control engine as main power and motor as auxiliary power source, therefore can effectively weaken because auxiliary power source is frequently got involved power output and impact that vehicle is produced, optimize the driver comfort of hybrid vehicle, adopted simultaneously driving engine can keep the dynamic property of vehicle can reach the purpose of energy-saving and emission-reduction again as main power and motor as the mode of auxiliary power source.In addition, the control method of hybrid electric vehicle power distribution of the present invention is simply effective.
In addition, according to the above embodiment of the present invention can also have following additional technical feature:
According to one embodiment of present invention, when described demand torque greater than the max. output torque of described driving engine and described battery charge state during greater than the battery charge state minimum value, control described hybrid vehicle and switch to the motor assist pattern, the max. output torque that described demand torque equals described driving engine adds the output torque of the above motor.
according to one embodiment of present invention, when described battery state of charge less than predetermined battery state-of-charge value and greater than the battery charge state minimum value, or when described battery charge state greater than in predetermined battery state-of-charge value and described demand torque during greater than the max. output torque of described motor, control described hybrid vehicle and switch to motor transitional to engine mode, at described motor transitional in engine mode, the output torque of described driving engine rises until the output torque of described driving engine equals described demand torque, and the output torque of described motor descends until be zero.
According to one embodiment of present invention, in engine mode, described motor output torque continues to begin to descend after predetermined amount of time again at described motor transitional.
According to one embodiment of present invention, after described motor transitional is completed to engine mode, when described demand torque is less than or equal to the max. output torque of described motor, controls described automobile and switch to described pure engine mode.
According to one embodiment of present invention,, control described hybrid vehicle and switch to electric-only mode during less than the max. output torque of described motor greater than predetermined battery state-of-charge value and described demand torque when described battery charge state.
According to one embodiment of present invention, when described battery state of charge equals the battery charge state minimum value, control described hybrid vehicle and switch to the protection battery mode so that battery no longer discharges.
According to one embodiment of present invention, pass through to reclaim braking energy so that battery is charged when stepping on the brake pedal of described hybrid vehicle.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Below above-mentioned and/or additional aspect of the present invention and advantages, accompanying drawing obviously and is easily understood becoming in the description of embodiment, wherein:
Fig. 1 is the diagram of circuit according to the control method of the hybrid electric vehicle power distribution of the embodiment of the present invention; With
Fig. 2 is the power exporting change diagram of curves according to the control method of the hybrid electric vehicle power distribution of the embodiment of the present invention.
The specific embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
in description of the invention, it will be appreciated that, term " " center ", " vertically ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance.
In description of the invention, need to prove, unless clear and definite regulation and restriction are separately arranged, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be captive joints, connect integratedly, can be also to removably connect; Can be mechanical connection or electrical connection, can be also the connection of two element internals; Can be directly to be connected, also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
Because the basic structure of hybrid vehicle is known for those skilled in the art know, so give unnecessary details no longer one by one at this.
The control method of distributing according to the hybrid electric vehicle power of the embodiment of the present invention is described below with reference to Fig. 1 and Fig. 2.
As depicted in figs. 1 and 2, particularly, the control method of distributing according to the hybrid electric vehicle power of the embodiment of the present invention comprises the following steps:
At first, detect battery charge state (SOC) and demand torque (Trqst) parameter (representing with curve 1 and curve 2 respectively in Fig. 2) of hybrid vehicle.Wherein the car load general controller can according to acceleration pedal information, adopt the mode of tabling look-up to carry out moment of torsion and resolve mensuration demand torque parameter value.
Then, switch the power distribution mode of hybrid vehicle according to the battery charge state of measuring and demand torque parameter by the car load general controller (HCU) of hybrid vehicle between electric-only mode (EV), hybrid mode (HEV) and pure engine mode.
Hybrid mode comprises motor transitional to engine mode and motor assist pattern, and the driving engine of hybrid vehicle is got involved power output as the motor of main power and hybrid vehicle as auxiliary power source in the motor assist pattern.Be far smaller than the rotor inertia of driving engine due to the rotor inertia of motor, so motor is got involved frequently power output and also can not caused impact to vehicle.
Thus, pass through in the motor assist pattern according to the control method that hybrid electric vehicle power of the present invention distributes, control engine as main power and motor as auxiliary power source, therefore can effectively weaken because auxiliary power source is frequently got involved power output and impact that vehicle is produced, optimize the driver comfort of hybrid vehicle, adopted simultaneously driving engine can keep the dynamic property of vehicle can reach the purpose of energy-saving and emission-reduction again as main power and motor as the mode of auxiliary power source.In addition, the control method of hybrid electric vehicle power distribution of the present invention is simply effective.
In Fig. 2, transverse axis represents time shaft, and is divided into six stages to represent respectively six different dynamic allocation models of hybrid vehicle.The size of longitudinal axis representation parameter numerical value.The parameter of hybrid vehicle adopts respectively different curves to represent: curve 1 expression battery state of charge, curve 2 expression demand torques, curve 3 expression motor output torque (T
M), curve 4 expression engine output torque (T
E), curve 5 expression brake pedals, and curve 6 expression acceleration pedals.
As shown in Figure 1, according to some embodiments of the present invention, detect battery charge state and the demand torque parameter value of hybrid vehicle, and respectively with predetermined battery state-of-charge value (SOC
set) and the max. output torque (T of motor
Mmax) relatively, greater than predetermined battery state-of-charge value and demand torque during less than the max. output torque value of motor, power-control method of the present invention is controlled hybrid vehicle and switched to electric-only mode when battery charge state.Predetermined battery state-of-charge value be one greater than battery charge state minimum value (SOC
min) preset value, and can do suitable adjustment with the design parameter of hybrid vehicle as required.
As shown in Figure 2, corresponding with above-mentioned electric-only mode, at t
0Constantly, battery charge state is higher, and demand torque is not very large, the output torque of motor (the torque responsive speed of motor is very fast) rapid response to customer's need moment of torsion, and control method therefore of the present invention is controlled hybrid vehicle and is adopted the electric-only mode outputting power.In the electric-only mode of embodiments of the invention, Motor torque almost overlaps with demand torque.In electric-only mode, engine torque (T
E) do not participate in power output, therefore go to zero always, namely overlap with time shaft.
as shown in Figure 1, detect battery charge state and the demand torque parameter value of hybrid vehicle, and battery charge state and predetermined battery state-of-charge value and battery charge state minimum value are compared, the max. output torque of demand torque and motor is compared, when battery charge state less than predetermined battery state-of-charge value and greater than the battery charge state minimum value, when perhaps demand torque is greater than the max. output torque of motor greater than predetermined battery state-of-charge value when battery charge state, power-control method of the present invention is controlled hybrid vehicle and is switched to motor transitional to engine mode.In engine mode, the output torque of driving engine rises until the output torque of driving engine equals demand torque at motor transitional, and simultaneously the output torque of motor descends until be zero, and namely driving engine is taken over motor and carried out power output.Wherein when battery state of charge reaches the battery charge state minimum value, force battery to stop discharge with the protection battery.
Preferably, in engine mode, the motor output torque continues to begin to descend after predetermined amount of time again at motor transitional, and when being in low value with the output torque that guarantees driving engine, the output of the power of hybrid vehicle can not interrupted.
As shown in Figure 2, corresponding to engine mode with motor transitional, at t
0To t
1In time period, the output torque predetermined amount of time of motor remains unchanged (as shown in FIG., at t
0Certain hour section inner curve 3 afterwards remains unchanged, then descends suddenly), reach demand torque with the synthetic output torque of guaranteeing driving engine and motor.By this control policy, the power output torque of vehicle does not interrupt, and keeps the acceleration sensation of vehicle.Subsequently, the output torque of motor begins to descend, and the output torque of driving engine rises, at t
1Constantly complete by the switching of electric-only mode to hybrid mode.After this process was completed, the propulsion source of vehicle changed driving engine into by motor, and hybrid vehicle is driven as power by driving engine.
As shown in Figure 1, after motor transitional is completed to engine mode, when demand torque is less than or equal to the max. output torque of motor (output torque of driving engine can satisfy the demands separately moment of torsion), controls automobile and switch to pure engine mode.
As shown in Figure 2, corresponding with pure engine mode, at t
1To t
2In time period, demand torque remains unchanged, and driving engine is as only propulsion source, and motor does not provide power output (curve 3 goes to zero and overlaps with time shaft).Start to export the machine moment of torsion and equal demand torque this moment, and engine operation is at high-efficiency point.
As shown in Figure 1, detect battery charge state and the demand torque parameter value of hybrid vehicle, and respectively with the max. output torque (T of battery charge state minimum value and driving engine
Emax) relatively, when demand torque greater than the max. output torque of driving engine and battery charge state during greater than the battery charge state minimum value, power-control method of the present invention is controlled hybrid vehicle and is switched to the motor assist pattern, and the max. output torque that demand torque equals driving engine adds the output torque of electrical generator.
As shown in Figure 2, corresponding with the motor assist pattern, at t
2To t
3In time period, demand torque continues to increase and surpass the max. output torque of driving engine.From t
2Constantly begin, motor is got involved power output as auxiliary power source.Because the rotor inertia of the relative driving engine of electric machine rotation inertia is much smaller, so the intervention of motor can weaken greatly to the impact of vehicle, the transition meeting is very smooth-going.
As shown in Figure 1, when battery state of charge equaled the battery charge state minimum value, power-control method of the present invention was controlled hybrid vehicle and is switched to the protection battery mode so that battery no longer discharges.
As shown in Figure 2, corresponding with the protection battery mode, at t
3To t
4In time period, battery charge state has reached the battery charge state minimum value, and power-control method of the present invention does not allow battery pack to discharge again, so motor does not provide moment of torsion (at t
3To t
4Time period inner curve 3 overlaps with time shaft substantially).From t
3Constantly rise, motor begins to break away from, and because the rotor inertia of the relative driving engine of electric machine rotation inertia is much smaller, so the impact that motor breaks away from vehicle can weaken greatly, transition also can be very smooth-going.At this moment, even engine torque has arrived maxim, but still can not reach demand torque, the battery pack of hybrid vehicle is also no longer discharged and is in the wait charge condition.
As shown in Figure 1, even stop when the brake pedal of stepping on hybrid vehicle makes car retardation, the energy that produce by the recyclable braking of the parts such as bearing shell this moment is with to batteries charging.
As shown in Figure 2, corresponding with the hybrid vehicle braking, at t
4To t
5In time period, brake pedal is stepped on (curve 5 rises and keeps level), vehicle carries out braking energy and reclaims, at this moment, curve 1 and curve 4 go to zero, curve 3 is negative value (being positioned at below time shaft) at this moment, namely represents motor reversal, curve 1 rising (namely to batteries charging).
In addition, curve 2 whole process and curve 6 corresponding variations substantially, namely demand torque changes with the variation of acceleration pedal.
In the description of this specification sheets, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (8)
1. the control method that hybrid electric vehicle power distributes, is characterized in that, comprises the following steps:
Detect battery charge state and the demand torque parameter of described hybrid vehicle; With
Switch the power distribution mode of described hybrid vehicle according to described parameter by the car load general controller of described hybrid vehicle between electric-only mode, hybrid mode and pure engine mode, wherein said hybrid mode comprises motor transitional to engine mode and motor assist pattern, at the driving engine of hybrid vehicle described in described motor assist pattern as the motor of main power and described hybrid vehicle as auxiliary power source.
2. the hybrid electric vehicle power according to claim 1 control method of distributing, it is characterized in that, when described demand torque greater than the max. output torque of described driving engine and described battery charge state during greater than the battery charge state minimum value, control described hybrid vehicle and switch to the motor assist pattern, the max. output torque that described demand torque equals described driving engine adds the output torque of the above motor.
3. the hybrid electric vehicle power according to claim 1 control method of distributing, it is characterized in that, when described battery charge state less than predetermined battery state-of-charge value and greater than the battery charge state minimum value, or when described battery charge state greater than in predetermined battery state-of-charge value and described demand torque during greater than the max. output torque of described motor, control described hybrid vehicle and switch to motor transitional to engine mode, at described motor transitional in engine mode, the output torque of described driving engine rises until the output torque of described driving engine equals described demand torque, and the output torque of described motor descends until be zero.
4. the control method of hybrid electric vehicle power distribution according to claim 3, is characterized in that, in engine mode, described motor output torque continues to begin to descend after predetermined amount of time again at described motor transitional.
5. the hybrid electric vehicle power according to claim 3 control method of distributing, it is characterized in that, after described motor transitional is completed to engine mode, when described demand torque is less than or equal to the max. output torque of described motor, controls described hybrid vehicle and switch to described pure engine mode.
6. the hybrid electric vehicle power according to claim 1 control method of distributing, it is characterized in that, when described battery charge state, is controlled described hybrid vehicle and switched to electric-only mode during less than the max. output torque of described motor greater than predetermined battery state-of-charge value and described demand torque.
7. the hybrid electric vehicle power according to claim 1 control method of distributing; it is characterized in that; when described battery charge state equals the battery charge state minimum value, control described hybrid vehicle and switch to the protection battery mode so that battery no longer discharges.
8. the control method of according to claim 1-7 described hybrid electric vehicle powers distribution of any one, is characterized in that, passes through to reclaim braking energy so that battery is charged when stepping on the brake pedal of described hybrid vehicle.
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