CN109910867A - A kind of engine working point optimization method of series parallel hybrid power vehicle - Google Patents

A kind of engine working point optimization method of series parallel hybrid power vehicle Download PDF

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CN109910867A
CN109910867A CN201910203861.2A CN201910203861A CN109910867A CN 109910867 A CN109910867 A CN 109910867A CN 201910203861 A CN201910203861 A CN 201910203861A CN 109910867 A CN109910867 A CN 109910867A
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torque
optimal
power generation
engine
revolving speed
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CN109910867B (en
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秦兆博
胡满江
徐彪
秦晓辉
谢国涛
王晓伟
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Hunan University
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Hunan University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/62Hybrid vehicles
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/80Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/84Data processing systems or methods, management, administration

Abstract

The invention discloses a kind of engine working point optimization methods of series parallel hybrid power vehicle, this method comprises: step 1, acquires engine speed parameter and motor torque parameter;Step 2, in the case of engine speed parameter is constant, by changing the size of motor torque parameter, corresponding engine oil consumption and ISG motor power consumption are calculated;Step 3, in the case of motor torque parameter constant, by changing the size of engine speed parameter, corresponding each engine oil consumption and ISG motor power consumption are calculated;Step 4, lateral comparison data are obtained;Step 5, longitudinal comparison data are obtained;Step 6, the longitudinal comparison data that the lateral comparison data and step 5 that foundation step 4 obtains obtain, determine optimal charging work point under engine start optimal working point and engine tandem working mode.The present invention is simple in rule, and search range is comprehensive, and applicability is wide, can be adapted for the optimization of the energy management strategies such as mixed connection, serial mixed power.

Description

A kind of engine working point optimization method of series parallel hybrid power vehicle
Technical field
The present invention relates to vehicle motor technical fields, more particularly to a kind of engine of series parallel hybrid power vehicle Operating point optimization method.
Background technique
Series-parallel hybrid electric system has preferable power performance and the economy performance, combines series hybrid electric vehicle And the advantages of parallel type hybrid vehicle, it has obtained faster development and has popularized, especially in motor bus field using more Extensively.Domestic most of series parallel type structure is using uniaxial or multiaxis series parallel type system, i.e. engine and ISG motor at present It is connected, is then connect by clutch apparatus with driving motor and energy source.
In the starting of engine, different from traditional starting method, is controlled using ISG motor torque, drive hair The start-up course of motivation.In the course of work of hybrid vehicle, especially in the work of mixed connection vehicle, in order to guarantee fuel oil Economy, engine should can will cause in the process a degree of energy dissipation according to the frequent start and stop of energy management strategies.Together Sample, in the region of tandem working, due to there is the process from fuel oil to power generation, the setting of working efficiency and power generation operation point is all Overall process fuel economy can be greatly affected, therefore the quality for how measuring a power generation cascade operating point also becomes one Important problem.
At present for above-mentioned two problems, most of solution is all the comparison by Operation mode cycle and practical road test Method is determined, and this method is not only not accurate enough, but also compares elapsed time and energy.
Summary of the invention
The purpose of the present invention is to provide next gram of a kind of engine working point optimization method of series parallel hybrid power vehicle Clothes or at least one of the drawbacks described above at least mitigating the prior art.
To achieve the above object, the present invention provides a kind of engine working point optimization side of series parallel hybrid power vehicle The engine working point optimization method of method, the series parallel hybrid power vehicle includes:
Step 1, engine speed parameter and motor torque parameter are acquired;
Step 2, in the case of the engine speed parameter is constant, by changing the big of the motor torque parameter It is small, calculate each motor torque parameter and the corresponding engine oil consumption of the constant engine speed parameter and ISG electricity Machine power consumption;
Step 3, in the case of the motor torque parameter constant, by changing the big of the engine speed parameter It is small, calculate each engine speed parameter and the corresponding each engine oil consumption of the constant motor torque parameter and ISG Motor power consumption;
Step 4, the engine oil consumption and ISG motor power consumption obtained according to the step 2, obtains lateral comparison number According to;
Step 5, the engine oil consumption and ISG motor power consumption obtained according to the step 3, obtains longitudinal comparison number According to;
Step 6, longitudinal ratio that the lateral comparison data and the step 5 obtained according to the step 4 obtain Compared with data, optimal charging work point under engine start optimal working point and engine tandem working mode is determined.
Further, in the step 1, the engine speed parameter includes unloading revolving speed, the motor torque parameter Including electric motor starting torque;
In step 2, the engine speed parameter further includes the unloading revolving speed, and the motor torque parameter further includes institute State electric motor starting torque;
The step 4 specifically includes:
Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each institute State electric motor starting torque and the corresponding each motor torque starting weight of the constant unloading revolving speed;
Step 42, the corresponding electricity of minimum value in each motor torque starting weight step 41 being calculated For machine detent torque as optimal electric motor starting torque, which is the lateral comparison data;
The step 5 specifically includes:
Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each institute State unloading revolving speed and the corresponding each unloading revolving speed starting weight of the constant electric motor starting torque;
Step 52, the minimum value in each unloading revolving speed starting weight that the step 51 is calculated corresponding is unloaded For idling speed as optimal unloading revolving speed, which is the longitudinal comparison data.
Further, " each electric motor starting torque and the constant unloading revolving speed pair are calculated in the step 41 " each unloading revolving speed and the constant motor are calculated in each motor torque starting weight answered " and/or the step 51 The calculation formula of the corresponding each unloading revolving speed starting weight of detent torque " is such as following formula (1):
H=(α fc+βpc)(1+γt+τna) (1)
In formula (1), α, β, γ and τ are weight coefficient, fcFor engine start oil consumption, pcFor ISG electric motor starting power consumption Amount, t is time since engine start, naFor overshoot revolving speed.
Further, the step 6 specifically includes:
Step 61, the minimum value C in the motor torque starting weight that the step 42 obtainsαWith the step 52 The obtained minimum value L in each unloading revolving speed starting weightαIn the case of meeting following formula (2), using described in formula (1) calculating The optimal unloading engine speed B ' that the optimal electric motor starting torque A ' and the step 52 that step 42 obtains are obtained Corresponding starting weight M, then Cα、LαWith the minimum value min (C in Ma,La, M) and corresponding electric motor starting torque and unloading revolving speed For the engine start optimal working point;
|Ca-La|≤Δ (2)
Step 62, the minimum value C in the motor torque starting weight that the step 42 obtainsαWith the step 52 The obtained minimum value L in each unloading revolving speed starting weightαIt then include the following two kinds feelings in the case of meeting following formula (3) Shape:
The first situation: if CaLess than Lα, then the optimal electric motor starting torque A ' that the step 42 obtains is the hair Motivation starts the electric motor starting torque in optimal working point;Again under the premise of the optimal electric motor starting torque A ' is constant, weight The multiple step 5 carries out longitudinal searching by changing unloading revolving speed, and obtained optimal unloading revolving speed is as the engine start Unloading revolving speed in optimal working point;
Second case: if CaGreater than Lα, then the step 52 obtains the optimal unloading engine speed B ' hair Motivation starts the unloading revolving speed in optimal working point;Again under the premise of the optimal unloading engine speed B ' is constant, repeat The process that above-mentioned S13 is provided, by changing the value of electric motor starting torque value A, repeating said steps 5, by changing electric motor starting Torque carries out longitudinal searching, and obtained optimal electric motor starting torque is opened as the motor in the engine start optimal working point Dynamic torque;
|Ca-La| > Δ (3)
The numerical value of formula (2) and the Δ in formula (3) is by CαAnd LαIt determines.
Further, the Δ in formula (2) and formula (3) meets:
Δ=5%min (Ca,La), in which: min (Ca,La) it is CαAnd LαIn minimum value.
Further, in the step 1, the engine speed parameter includes power generation revolving speed, the motor torque parameter Including the torque that generates electricity;
In step 2, the engine speed parameter further includes the power generation revolving speed, and the motor torque parameter further includes institute State power generation torque;
The step 4 specifically includes:
Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each institute State power generation revolving speed and the corresponding each electric ratio of oil of the constant power generation torque;
Step 42, each oil minimum value corresponding power generation revolving speed of the electricity than in the step 41 being calculated as Optimal power generation revolving speed, the optimal power generation revolving speed are the lateral comparison data;
The step 5 specifically includes:
Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each institute State power generation torque and the corresponding each electric ratio of oil of the constant power generation revolving speed;
Step 52, each oil minimum value corresponding power generation torque of the electricity than in the step 51 being calculated as Optimal power generation torque, the optimal power generation torque are the longitudinal comparison data.
7. the engine working point optimization method of series parallel hybrid power vehicle as claimed in claim 6, feature exist In, " calculating each power generation revolving speed and the corresponding each electric ratio of oil of the constant power generation torque " in the step 41 and/or The calculating of " calculating each power generation torque and the corresponding each electric ratio of oil of the constant power generation revolving speed " in the step 51 is public Formula is such as following formula (5):
In formula (5), fcFor fixed time period t intrinsic motivation oil consumption, pcFor ISG electric power generation amount in fixed time period t.
Further, the step 6 specifically includes:
Step 61, the first optimal oily electricity ratio η obtained in the step 42nThe the second optimal oil obtained with the step 52 Electricity is than being ηTIn the case of meeting following formula (6), the optimal power generation revolving speed n that the step 42 obtains is calculated using formula (5)e' and The optimal power generation torque T that the step 52 obtainsg' corresponding oil electricity is than η, then the first optimal oily electricity ratio ηn, it is second optimal Oily electricity is than being ηTWith the minimum value min (η in ηnT, η) and corresponding power generation torque and power generation revolving speed be that the engine is connected work Optimal charging work point under operation mode;
nT|≤Δ (6)
Step 62, in the first optimal oily electricity ratio ηnWith the second optimal oil electricity than being ηTIn the case of meeting following formula (7), then wrap Include the following two kinds situation:
The first situation: if ηnLess than ηT, then the step 42 obtains optimal power generation revolving speed ne' it is the engine string Join the power generation revolving speed under operating mode in optimal charging work point;Again in the optimal power generation revolving speed ne' it is constant under the premise of, weight The multiple step 5 carries out longitudinal searching by changing power generation torque, and obtained optimal power generation torque is connected as the engine Power generation torque under operating mode in optimal charging work point;
Second case: if ηnGreater than ηT, then the step 52 obtains the optimal power generation torque Tg' start to be described Power generation torque under machine tandem working mode in optimal charging work point;Again under the premise of the optimal power generation torque is constant, Repeating said steps 5 carry out longitudinal searching by changing power generation revolving speed, and obtained optimal power generation revolving speed is as the engine string Join the power generation revolving speed under operating mode in optimal charging work point;
nT| > Δ (7)
The numerical value of formula (6) and the Δ in formula (7) is by ηnAnd ηTIt determines.
Further, the Δ in formula (6) and formula (7) meets:
Δ=5%min (ηnT), in which: min (ηnT) it is ηnAnd ηTIn minimum value.
Further, in the step 1, the engine speed parameter further includes power generation revolving speed, the motor torque ginseng Number further includes power generation torque;
In step 2, the engine speed parameter further includes the power generation revolving speed, and the motor torque parameter further includes institute State power generation torque;
The step 4 specifically includes:
Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each institute State power generation revolving speed and the corresponding each electric ratio of oil of the constant power generation torque;
Step 42, each oil minimum value corresponding power generation revolving speed of the electricity than in the step 41 being calculated as Optimal power generation revolving speed, the optimal power generation revolving speed are the lateral comparison data;
The step 5 specifically includes:
Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each institute State power generation torque and the corresponding each electric ratio of oil of the constant power generation revolving speed;
Step 52, each oil minimum value corresponding power generation torque of the electricity than in the step 51 being calculated as Optimal power generation torque, the optimal power generation torque are the longitudinal comparison data;
The step 6 specifically includes:
Step 61, the first optimal oily electricity ratio η obtained in the step 42nThe the second optimal oil obtained with the step 52 Electricity is than being ηTIn the case of meeting following formula (6), the optimal power generation revolving speed n that the step 42 obtains is calculated using formula (5)e' and The optimal power generation torque T that the step 52 obtainsg' corresponding oil electricity is than η, then the first optimal oily electricity ratio ηn, it is second optimal Oily electricity is than being ηTWith the minimum value min (η in ηnT, η) and corresponding power generation torque and power generation revolving speed be that the engine is connected work Optimal charging work point under operation mode;
nT|≤Δ (6)
Step 62, in the first optimal oily electricity ratio ηnWith the second optimal oil electricity than being ηTIn the case of meeting following formula (7), then wrap Include the following two kinds situation:
The first situation: if ηnLess than ηT, then the step 42 obtains optimal power generation revolving speed ne' it is the engine string Join the power generation revolving speed under operating mode in optimal charging work point;Again in the optimal power generation revolving speed ne' it is constant under the premise of, weight The multiple step 5 carries out longitudinal searching by changing power generation torque, and obtained optimal power generation torque is connected as the engine Power generation torque under operating mode in optimal charging work point;
Second case: if ηnGreater than ηT, then the step 52 obtains the optimal power generation torque Tg' start to be described Power generation torque under machine tandem working mode in optimal charging work point;Again under the premise of the optimal power generation torque is constant, Repeating said steps 5 carry out longitudinal searching by changing power generation revolving speed, and obtained optimal power generation revolving speed is as the engine string Join the power generation revolving speed under operating mode in optimal charging work point;
nT| > Δ (7)
The numerical value of formula (6) and the Δ in formula (7) is by ηnAnd ηTIt determines.
The present invention is simple in rule, and search range is comprehensive, and applicability is wide, can be adapted for mixed connection, serial mixed power etc. The optimization of energy management strategies.
Detailed description of the invention
Fig. 1 is the revolving speed schematic diagram of engine starting process provided by the invention.
Fig. 2 is the revolving speed schematic diagram that engine enters tandem working mode.
Fig. 3 is the method figure of related engine start operating point optimization of the invention.
Fig. 4 is the method figure of related engine tandem working point optimization of the invention.
Fig. 5 a is that instantaneous oil consumption changes with time situation in starting, and abscissa indicates that the time, (unit was 10-4S), it indulges and sits Mark indicates instantaneous oil consumption (unit is L/h);
Fig. 5 b is that instantaneous power consumption changes with time situation in starting, and abscissa indicates that the time, (unit was 10-4S), it indulges and sits Mark indicates instantaneous oil consumption (unit is Ws);
Fig. 6 a is that fuel consumption in tandem working mode in power generation process changes with time situation, when abscissa indicates Between (unit is 10-4S), ordinate indicates instantaneous oil consumption (unit is L/h);
Fig. 6 b is that power consumption in tandem working mode in power generation process changes with time situation, and abscissa indicates the time (unit is 10-4S), ordinate indicates instantaneous oil consumption (unit is Ws).
Specific embodiment
In the accompanying drawings, same or similar element is indicated using same or similar label or there is same or like function Element.The embodiment of the present invention is described in detail with reference to the accompanying drawing.
In the description of the present invention, term " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", "vertical", The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is that orientation based on the figure or position are closed System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have Specific orientation is constructed and operated in a specific orientation, therefore should not be understood as limiting the scope of the invention.
The engine working point optimization method of series parallel hybrid power vehicle provided in this embodiment includes:
Step 1, engine speed parameter and motor torque parameter are acquired;
Step 2, in the case of the engine speed parameter is constant, by changing the big of the motor torque parameter It is small, calculate each motor torque parameter and the corresponding engine oil consumption of the constant engine speed parameter and ISG electricity Machine power consumption;
Step 3, in the case of the motor torque parameter constant, by changing the big of the engine speed parameter It is small, calculate each engine speed parameter and the corresponding each engine oil consumption of the constant motor torque parameter and ISG Motor power consumption;
Step 4, the engine oil consumption and ISG motor power consumption obtained according to the step 2, obtains lateral comparison number According to;
Step 5, the engine oil consumption and ISG motor power consumption obtained according to the step 3, obtains longitudinal comparison number According to;
Step 6, longitudinal ratio that the lateral comparison data and the step 5 obtained according to the step 4 obtain Compared with data, optimal charging work point under engine start optimal working point and engine tandem working mode is determined.
The engine working point optimization method of series parallel hybrid power vehicle provided in this embodiment is suitable for uniaxial or more Axis series parallel hybrid power vehicle (serial mixed power is also applicable in) both can be used for measuring the optimal work of engine start Point can be also used for the measurement optimal charging work point of tandem working mode.Illustrate specifically to survey respectively below for different operating conditions Determine method.
Illustrate the measuring method (as shown in Figure 3) of the engine start optimal working point of engine startup first, it should Method includes:
In step 1, gone out according to the kinetic parameter of engine, such as frictional electric machine torque and commissioning experience, primary Calculation Electric motor starting torque initial value A (motor is torque control model) needed for starting, after applying motor torque, in engine speed value When reaching revolving speed initial value B, the electric motor starting torque, to obtain the engine parameter in entire start-up course, the engine are removed Parameter includes time since engine start t, engine start oil consumption fc, ISG electric motor starting power consumption pcWith overshoot revolving speed na.It is described The acquisition methods of engine parameter are as follows:
As shown in Figure 1, the acquisition modes about time since engine start t comprising: time since engine start t is from hair Motivation Startup time t0To engine peed stable moment t2Between time, the specific value of time since engine start t can pass through Engine message is read.Wherein: engine peed stable moment t2Refer to the basicly stable moment t of engine speed1And then By several continuous (such as: 5 periods) in periods, also, engine speed fluctuating range (fluctuation width above and below idle speed value Degree such as can be set to 3r/min, may be set to be 5r/min, and the specific value of the fluctuating range is according to engine spy Property determine) stablize at the time of.About engine start oil consumption fcAcquisition modes comprising: read according to engine message The instantaneous fuel consumption values in time since engine start t calculate instantaneous fuel consumption values in time since engine start using integration method Fuel consumption values in t, i.e. engine start oil consumption fc.About ISG electric motor starting power consumption pcAcquisition modes comprising: according to The ISG motor torque (being hereafter referred to as " motor torque ") and engine speed that ISG motor message is read, find out engine and open Power consumption value in dynamic time t, i.e. ISG electric motor starting power consumption pc.About overshoot revolving speed naAcquisition modes, be maximum speed Point arrives the rotational speed difference of idle speed value.
In the step 1, the engine speed parameter includes unloading revolving speed (full name is " engine speed when unloading "), The motor torque parameter includes electric motor starting torque (full name is " the electric motor starting torque of ISG motor ").
In step 2, the engine speed parameter further includes the unloading revolving speed, and the motor torque parameter further includes institute State electric motor starting torque.
In step 2, " in the case of the engine speed parameter is constant, by changing the motor torque parameter Size " is specifically referred to by changing electric motor starting torque value.That is, only changing electricity on the basis of unloading tachometer value is B Machine detent torque value.Such as: on the basis of electric motor starting torque initial value A, change a respectively up and down, obtained electric motor starting Torque can be A+a, A-a, A+2a, A-2a etc..It need to substantially guarantee the temperature of engine in the starting experiment of each transformation parameter Degree maintains certain value.
In step 2, " each motor torque parameter and the constant corresponding engine of the engine speed parameter are calculated Oil consumption and ISG motor power consumption " specifically refers in the case of unloading tachometer value and electric motor starting torque and determining, using known Corresponding engine oil consumption and ISG motor power consumption is calculated in method.Such as: current embodiment require that the amount sought includes: Electric motor starting torque is A, unloading tachometer value is the corresponding engine oil consumption of B and ISG motor power consumption, unloading tachometer value be B, Electric motor starting torque is the corresponding engine oil consumption of A+a and ISG motor power consumption, and unloading tachometer value is B, electric motor starting torque For the corresponding engine oil consumption of A-a and ISG motor power consumption, unloading tachometer value is B, electric motor starting torque is A+2a corresponding Engine oil consumption and ISG motor power consumption, unloading tachometer value is B, electric motor starting torque is the corresponding engine consumption of A-2a Amount and ISG motor power consumption etc..
In step 4, " the engine oil consumption and ISG motor power consumption obtained according to the step 2 obtains lateral comparison Data " specifically include:
As shown in figure 3, illustrating the specific implementation of S13 below by a specific embodiment, referring to the left side of Fig. 3 Two column.Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each electricity Machine detent torque and the corresponding each motor torque of the constant unloading revolving speed start weight.That is, being obtained according to change Each electric motor starting torque value, utilize formula (1) to calculate the corresponding motor torque of each electric motor starting torque value and start weight Ci, i =1...n, n are the natural number greater than 5.By taking n is 5 as an example: the corresponding initial motor torque starting power of electric motor starting torque initial value A Value C1, the corresponding first motor torque starting weight C of first motor detent torque value A+a2, the second A-a pairs of electric motor starting torque value The the second motor torque starting weight C answered3, the corresponding third motor torque starting weight C of third electric motor starting torque value A+2a4, Corresponding 4th motor torque of 4th electric motor starting torque value A-2a starts weight C5
H=(α fc+βpc)(1+γt+τna) (1)
In formula (1), α, β, γ and τ are weight coefficient.Wherein: α and β is principal element, for measuring start-up course Cost value, the two are the multiple proportions determined between α and β according to the equivalent oil mass value of consumption unit quantity of electricity, and generally desirable α is 1, β is about 3 or so, needs to be calculated according to engine using characteristic.γ and τ are smaller, are secondary cause, and both less than 1.If hair Motivation starts time t and overshoot revolving speed naBring influence is smaller, i.e. the value of γ and τ are less than the threshold value of setting, can ignore not Meter.
Step 42, the corresponding electricity of minimum value in each motor torque starting weight step 41 being calculated For machine detent torque as optimal electric motor starting torque, which is the lateral comparison data." each motor turns Minimum value in square starting weight " is expressed as Cα=min (C1,C2,...,Cn), C at this timeαCorresponding electric motor starting torque A ' work For optimal electric motor starting torque, which is the lateral comparison data.Unloading tachometer value at this time is still For B.
In step 3, " in the case of the motor torque parameter constant, by changing the engine speed parameter Size " specifically refers to: on the basis of electric motor starting torque initial value A, only changing unloading engine speed value.Such as: starting On the basis of machine revolving speed initial value B, change a respectively up and down, obtained unloading engine speed can be B+a, B-a, B+2a, B- 2a etc..It need to substantially guarantee that the temperature of engine maintains certain value in the starting experiment of each transformation parameter.
In step 3, " calculates each engine speed parameter and the constant motor torque parameter is corresponding respectively starts Oil Consumption and ISG motor power consumption " specifically refers to utilize public affairs in the case of unloading tachometer value and electric motor starting torque determines Corresponding engine oil consumption and ISG motor power consumption is calculated in perception method.Such as: current embodiment require that the amount packet sought Include: electric motor starting torque is A, unloading tachometer value is the corresponding engine oil consumption of B and ISG motor power consumption, and electric motor starting turns Square is A, unloading tachometer value is the corresponding engine oil consumption of B+a and ISG motor power consumption, and electric motor starting torque is A, unloads idling Speed value is the corresponding engine oil consumption of B-a and ISG motor power consumption, and electric motor starting torque is A, unloading tachometer value is B+2a pairs The engine oil consumption and ISG motor power consumption answered, electric motor starting torque is A, unloading tachometer value is the corresponding engine of B-2a Oil consumption and ISG motor power consumption etc..
In the step 5, " the engine oil consumption and ISG motor power consumption obtained according to the step 3 is obtained longitudinal Compare data " it specifically includes:
As shown in figure 3, illustrating the specific implementation of S13 below by a specific embodiment, referring to the right side of Fig. 3 Two column.Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2 calculates each described unload Idling speed and the corresponding each unloading revolving speed of the constant electric motor starting torque start weight.That is, being obtained according to change Each unloading engine speed value, utilize formula (1) to calculate the corresponding unloading revolving speed starting weight of each unloading engine speed value Li, i=1...n, n are the natural number greater than 5.By taking n is 5 as an example: the corresponding initial unloading revolving speed of unloading engine speed initial value B Start weight L1, the corresponding first unloading revolving speed starting weight L of the first unloading engine speed value B+a2, the second unloading engine The corresponding second unloading revolving speed of tachometer value B-a starts weight L3, the corresponding third unloading of third unloading engine speed value B+2a Revolving speed starts weight L4, the corresponding 4th unloading revolving speed starting weight L of the 4th unloading engine speed value B-2a5
Step 52, the minimum value in each unloading revolving speed starting weight that the step 51 is calculated corresponding is unloaded For idling speed as optimal unloading revolving speed, which is the longitudinal comparison data." in each unloading revolving speed starting weight Minimum value " be expressed as Lα=min (L1,L2,...,Ln), L at this timeαCorresponding unloading engine speed B ' is used as longitudinal comparison Optimal unloading revolving speed, the optimal unloading revolving speed be the longitudinal comparison data, electric motor starting torque at this time is still A.
The step 6 specifically includes:
Step 61, the minimum value C in the motor torque starting weight that the step 42 obtainsαWith the step 52 The obtained minimum value L in each unloading revolving speed starting weightαIn the case of meeting following formula (2), i.e., two values are close, utilize Formula (1) calculates the optimal electric motor starting torque A ' that the step 42 obtains and the optimal unloading that the step 52 obtains The corresponding starting weight M of engine speed B ', then Cα、LαWith the minimum value min (C in Ma,La, M) and corresponding electric motor starting turns Square and unloading revolving speed are the engine start optimal working point;
|Ca-La|≤Δ (2)
In formula (2), Δ=5%min (Ca,La), as mark relatively, in which: min (Ca,La) it is CαAnd Lα In minimum value.
Step 62, the minimum value C in the motor torque starting weight that the step 42 obtainsαWith the step 52 The obtained minimum value L in each unloading revolving speed starting weightαIn the case of meeting following formula (3), i.e., two values are apart from each other, Then include the following two kinds situation:
The first situation: if CaLess than Lα, then the optimal electric motor starting torque A ' that the step 42 obtains is the hair Motivation starts the electric motor starting torque in optimal working point;Again under the premise of the optimal electric motor starting torque A ' is constant, weight The multiple step 5 carries out longitudinal searching by changing unloading revolving speed, and obtained optimal unloading revolving speed is as the engine start Unloading revolving speed in optimal working point.
Second case: if CaGreater than Lα, then the step 52 obtains the optimal unloading engine speed B ' hair Motivation starts the unloading revolving speed in optimal working point;Again under the premise of the optimal unloading engine speed B ' is constant, repeat The process that above-mentioned S13 is provided, by changing the value of electric motor starting torque value A, repeating said steps 5, by changing electric motor starting Torque carries out longitudinal searching, and obtained optimal electric motor starting torque is opened as the motor in the engine start optimal working point Dynamic torque;
|Ca-La| > Δ (3)
In formula (2), Δ=5%min (Ca,La), as mark relatively, in which: min (Ca,La) it is CαAnd Lα In minimum value.
Then, illustrate the measuring method (as shown in Figure 4) of engine tandem working mode charging optimal working point, this method Include:
According to the demand power P in vehicle pass-through, vehicle demand power P includes dynamics demand power and in-car accessories Power), a lower economic zone of fuel consumption rate is selected in engine Map performance plot, and it is as follows to find a satisfaction The operating point of formula (4):
In formula (4), neIt (r/min) is engine power generation revolving speed (hereinafter referred to as " power generation revolving speed "), TgIt (Nm) is ISG The corresponding power generation torque of motor (hereinafter referred to as " power generation torque "), PchargeIt (kW) is the generated output that need to be stored in energy-storage travelling wave tube, P (kW) is vehicle demand power.
As shown in Fig. 2, take engine from one section of set time t in the course of work for launching into stable electric generation (such as 20s), according to engine Map performance plot, the range of the higher engine power generation revolving speed of efficiency is determined as nsTo nl, corresponding Ground, each corresponding range of the corresponding electric power generation torque of engine power generation rotary speed working point are Tgs(n)To Tgl(n)
Using with engine start operating point determine by the way of, i.e., respectively by longitudinal comparison, lateral comparison method into Row search, but judge index is varied, and passes through control power generation revolving speed respectively and the power generation amount of torque of working in set time t It is constant, and change another amount, it obtains in set time t, spent amount of fuel is fc(L), generated electricity is pc (kWh), then the representation of concept for proposing oily electric ratio is formula (5), and oil electricity is than fuel oil ratio η used in the electricity for every power generation 1kWh Are as follows:
In formula (5), fcFor fixed time period t intrinsic motivation oil consumption, pcFor ISG electric power generation amount in fixed time period t.
Fuel oil compares that η is smaller, then oil be converted into electricity efficiency it is higher, it is more economical.
In the step 1, the engine speed parameter includes power generation revolving speed (full name is " engine power generation revolving speed "), institute Stating motor torque parameter includes power generation torque (full name is " the corresponding power generation torque of ISG motor ").
In step 2, the engine speed parameter further includes the power generation revolving speed, and the motor torque parameter further includes institute State power generation torque.
In step 2, " in the case of the engine speed parameter is constant, by changing the motor torque parameter Size " specifically refers in power generation torque value be TgOn the basis of constant, only change power generation revolving speed ne.Such as: in power generation revolving speed initial value neBasis on, change n respectively up and down, obtained power generation revolving speed can be ne+n、ne-n、ne+2n、ne- 2n etc..
In step 2, " each motor torque parameter and the constant corresponding engine of the engine speed parameter are calculated Oil consumption and ISG motor power consumption " specifically refers to utilize known method in the case of generating electricity torque value and determining power generation revolving speed Corresponding engine oil consumption and ISG motor power consumption is calculated.Such as: current embodiment require that the amount sought includes: power generation Torque value is Tg, power generation revolving speed neCorresponding engine oil consumption and ISG motor power consumption, power generation torque value are Tg, power generation revolving speed neThe corresponding engine oil consumption of+n and ISG motor power consumption, power generation torque value are Tg, power generation revolving speed neThe corresponding engine of-n Oil consumption and ISG motor power consumption, power generation torque value are Tg, power generation revolving speed neThe corresponding engine oil consumption of+2n and ISG motor Power consumption, power generation torque value are Tg, power generation revolving speed neThe corresponding engine oil consumption of -2n and ISG motor power consumption etc..
In step 4, " the engine oil consumption and ISG motor power consumption obtained according to the step 2 obtains lateral comparison Data " specifically include:
As shown in figure 4, illustrate the specific implementation of S13 below by a specific embodiment, left side referring to fig. 4 Two column.Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each hair Electric revolving speed and the corresponding each electric ratio of oil of the constant power generation torque.That is, according to each power generation tachometer value that change obtains, Each power generation tachometer value and the corresponding oily ratio η of constant power generation torque are calculated using formula (5)ni, i=1...n, n are greater than 5 Natural number.By taking n is 5 as an example: power generation revolving speed initial value neWith power generation torque initial value TgCorresponding initial oil ratio ηn1, the first power generation turn Fast value ne+ n and power generation torque initial value TgCorresponding first oily ratio ηn2, the second power generation tachometer value ne- n and power generation torque initial value Tg Corresponding second oily ratio ηn3, third power generation tachometer value ne+ 2n and power generation torque initial value TgCorresponding third oil ratio ηn4, the 4th Generate electricity tachometer value ne- 2n and power generation torque initial value TgCorresponding 4th oily ratio ηn5
Step 42, each oil minimum value corresponding power generation revolving speed of the electricity than in the step 41 being calculated as Optimal power generation revolving speed, the optimal power generation revolving speed are the lateral comparison data." minimum value in each oil ratio " is expressed as ηn= min(ηn1n2...), the oily ratio η of first at this timenCorresponding power generation tachometer value ne' it is used as optimal power generation revolving speed, this is optimal Power generation revolving speed is the lateral comparison data.Power generation torque value at this time is still TgIt is constant.
In step 3, " in the case of the motor torque parameter constant, by changing the engine speed parameter Size " specifically refers to: being n in power generation tachometer valueeOn the basis of constant, only change power generation torque Tg.Such as: at the beginning of the torque that generates electricity Value TgBasis on, change T respectively up and down, the power generation torque of obtained electric motor starting can be Tg+T、Tg-T、Tg+2T、Tg-2T Deng.It need to substantially guarantee that the temperature of engine maintains certain value in the starting experiment of each transformation parameter.
In step 3, " calculates each engine speed parameter and the constant motor torque parameter is corresponding respectively starts Oil Consumption and ISG motor power consumption " specifically refers to utilize known side in the case of generating electricity tachometer value and determining power generation torque Corresponding engine oil consumption and ISG motor power consumption is calculated in method.Such as: current embodiment require that the amount sought includes: hair Electric revolving speed ne, power generation torque value be TgCorresponding engine oil consumption and ISG motor power consumption, generate electricity revolving speed ne, power generation torque value For TgThe corresponding engine oil consumption of+T and ISG motor power consumption, generate electricity revolving speed ne, power generation torque value be Tg- T is corresponding to be started Oil Consumption and ISG motor power consumption, generate electricity revolving speed ne, power generation torque value be TgThe corresponding engine oil consumption of+2T and ISG electricity Machine power consumption, generate electricity revolving speed ne, power generation torque value be TgThe corresponding engine oil consumption of -2T and ISG motor power consumption.
The step 5 specifically includes: " the engine oil consumption and ISG motor power consumption obtained according to the step 3, is obtained Obtain longitudinal comparison data " it specifically includes:
As shown in figure 4, illustrate the specific implementation of S13 below by a specific embodiment, right side referring to fig. 4 Two column.Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each hair Electric torque and the corresponding each electric ratio of oil of the constant power generation revolving speed.That is, each power generation torque value arrived, utilizes formula (5) each power generation torque value and the corresponding oily ratio η of constant power generation revolving speed are calculatedTi, i=1...n, n are the natural number greater than 5. By taking n is 5 as an example: power generation torque initial value TgWith power generation revolving speed initial value neCorresponding initial oil ratio ηT1, the first power generation torque value Tg+T With power generation revolving speed initial value neCorresponding first oily ratio ηT2, the second power generation torque value Tg- T and power generation revolving speed initial value neCorresponding Two oily ratio ηT3, third power generation torque value Tg+ 2T and power generation revolving speed initial value neCorresponding third oil ratio ηT4, the 4th power generation torque Value Tg- 2T and power generation revolving speed initial value neCorresponding 4th oily ratio ηT5
Step 52, each oil minimum value corresponding power generation torque of the electricity than in the step 51 being calculated as Optimal power generation torque, the optimal power generation torque are the longitudinal comparison data.In S24, " minimum value in each oil ratio " is indicated For ηT=min (ηT1T2...), the oily ratio η of second at this timeTCorresponding power generation tachometer value Tg' as the optimal of lateral comparison Generate electricity tachometer value, and power generation tachometer value at this time is still neIt is constant.That is, as power generation revolving speed neWhen constant, power generation torque is Tg' when, the second optimal oil electricity is obtained than being ηT
The step 6 specifically includes:
Step 61, the first optimal oily electricity ratio η obtained in the step 42nThe the second optimal oil obtained with the step 52 Electricity is than being ηTIn the case of meeting following formula (6), i.e., the first optimal oily electricity ratio ηnWith the second optimal oil electricity than being ηTRelatively.With Formula (5) calculates the optimal power generation revolving speed n that the step 42 obtainse' the optimal power generation obtained with the step 52 turns Square Tg' corresponding oil electricity is than η, then the first optimal oily electricity ratio ηn, second it is optimal oil electricity than be ηTWith the minimum value min (η in ηn, ηT, η) and corresponding power generation torque and power generation revolving speed be optimal charging work point under the engine tandem working mode;
nT|≤Δ (6)
In formula (6), Δ=5%min (ηnT) in, as mark relatively.min(ηnT) it is ηnAnd ηTIn Minimum value.
Step 62, in the first optimal oily electricity ratio ηnWith the second optimal oil electricity than being ηTIn the case of meeting following formula (7), i.e., two A value is apart from each other, includes the following two kinds situation:
The first situation: if ηnLess than ηT, then the step 42 obtains optimal power generation revolving speed ne' it is the engine string Join the power generation revolving speed under operating mode in optimal charging work point;Again in the optimal power generation revolving speed ne' it is constant under the premise of, weight The multiple step 5 carries out longitudinal searching by changing power generation torque, and obtained optimal power generation torque is connected as the engine Power generation torque under operating mode in optimal charging work point.
Second case: if ηnGreater than ηT, then the step 52 obtains the optimal power generation torque Tg' start to be described Power generation torque under machine tandem working mode in optimal charging work point;Again under the premise of the optimal power generation torque is constant, Repeating said steps 5 carry out longitudinal searching by changing power generation revolving speed, and obtained optimal power generation revolving speed is as the engine string Join the power generation revolving speed under operating mode in optimal charging work point;
nT| > Δ (7)
In formula (7), Δ=5%min (ηnT) in, as mark relatively.min(ηnT) it is ηnAnd ηTIn Minimum value.
If multi-operating points mode, then remaining operating point repeats aforesaid operations selection.
The present embodiment carries out the analysis of transverse and longitudinal by establishing a kind of optimization method respectively by control variate method first, Effective quantitative measurement index is chosen, obtains two optimal values by comparing;Finally by further judgement and analysis, pass through Intersect more available whole optimal value and optimal working point.The advantages of embodied, is as follows:
1. this method uses simple in rule, the quantitative concept for applying weight function and the electric ratio of oil is compared, and is guaranteed The accuracy calculated.
2. this method search range is comprehensive, it is not required to carry out more verifying, on the basis of guaranteeing certain experiment condition, i.e., Available accurate qualitative relationships provide the foundation of operating point formulation.
3. this method applicability is wide, it can be adapted for the optimization of the energy management strategies such as mixed connection, serial mixed power.Together When be not limited only to starting mentioned above, operating condition of connecting, the formulation of other such as engine operation curves is see also we Method.Measurement is simple, calculates and is easy, and the link that can be used as hybrid vehicle energy management strategy later period Optimal Development carries out.
Based on above system, explain the present invention to the optimal work of the engine start of actual vehicle below by specific embodiment Make the effect of optimization of point and engine tandem working mode charging optimal working point:
The vehicle parameter of use is as shown in table 1, and the environment temperature in experiment is 20 degree or so, and the temperature of engine is heat engine 70 ± 2 degrees Celsius of temperature.
1 hybrid electric vehicle major parameter of table
Vehicle mass m(kg) 16500
Engine power rating revolving speed ne(r/min) 2300
Maximum power Pe(kW) 160
ISG motor maximum power P(kW) 135
ISG motor maximum torque N(N·m) 850
ISG motor maximum (top) speed n(mm) 3100
Radius of wheel r(mm) 0.5
1) starting engine ISG motor torque according to initial value is 350Nm, and engine speed when unloading is 550r/ min.In practical calculating, using the instantaneous fuel consumption data quoted in engine, revolving speed, the electricity of rotary speed data and ISG motor Machine torque data.The engine idle rotational is 650r/min.
2) lateral calculations are carried out.Firstly, electric motor starting torque is that 350Nm is constant, the revolving speed for starting unloading is respectively 600,550,500,450,400,350, six groups, obtained data are as shown in the table:
Since overshoot revolving speed influences less, the weight factor of overshoot revolving speed can be approximately 0.
Can significantly it see substantially, with the increase of unloading revolving speed, oil consumption is gradually reduced, and what power consumption gradually increased becomes Gesture, but the increase of oil consumption becomes apparent, and it is less that power consumption increases ratio.In addition, being clearly visible 550r/min, 600r/min is increased to Afterwards, power consumption and oil consumption all become bad.
If 500r/min is unloaded, unloaded to 550r/min, oil consumption reduces 15%, and power consumption increases 6%, and effect should be Improve.Under this group, it is best that 550r/min starts unloading effect for analysis.
2) longitudinal comparison is carried out, unloading revolving speed is scheduled under 550r/min, and electric motor starting torque is scheduled on 300Nm respectively, 350Nm, 400Nm, 450Nm, obtained data are as shown in table 3:
This group is it can be found that when electric motor starting torque increases, and oil consumption has significant reduction, and power consumption is also reduced Very much.Wherein, RED sector and current 500r/min are unloaded, and 350Nm motor torque is compared, and oil consumption improves 22.3%, Power consumption improves 17.6%.As can be seen that this method is compared to best, i.e. unloading revolving speed becomes larger, and motor torque also becomes larger.
3) transverse and longitudinal is comprehensively compared.
As can be seen that as shown in table 4, remaining the best of red, although power consumption reduces 5.3%, oil consumption increases Add 10%, certainly, 500r/min unloading, 400Nm also will be far better than current method.
3) transverse and longitudinal is comprehensively compared.
As can be seen that as shown in table 4, remaining the best of red, although power consumption reduces 5.3%, oil consumption increases Add 10%, certainly, 500r/min unloading, 400Nm also will be far better than current method.
So by comparing, it is easy to obtained final conclusion: using unloading revolving speed 550r/min, electric motor starting The effect of torque 450Nm is best, followed by unloading revolving speed 500r/min, electric motor starting torque 400Nm, is thirdly unloading Revolving speed 500r/min, electric motor starting torque 350Nm (currently active mode).
Motor torque is excessive when due to worrying starting, accelerates the too fast damage to motor, calculates lower motor from 0 to 500r/ The acceleration time of min.Correspondence is as follows:
There is no problem, can actually select.
It is unloaded with reference to Fig. 5 a and Fig. 5 b, 550r/min, 450Nm electric motor starting torque is best.
Work range selection example about serial connection charge
1) range of initial SOC is in 25%-26.5%, and each engine is charged to operating point is entered from inactive, charging Duration takes 20s, and the length of time tested every time maintains essentially in fixed level, and the time is longer, and that power consumption calculates selection is ISG The revolving speed of motor and power generation torque.
Since the Map performance plot of this work dot pattern and engine should also be closely bound up, first from Map characteristic The more economical point 1200r/min power generation revolving speed of engine, 400Nm power generation torque are selected in figure.
2) lateral comparison is first carried out, enabling charging machine torque is that 400Nm is constant, and engine operation revolving speed is respectively Five groups of 1100r/min, 1150r/min, 1200r/min, 1250r/min, 1300r/min, obtained data are as shown in the table:
Motor torque (Nm) 400 400 400 400 400
Engine speed (r/min) 1100 1150 1200 1250 1300
Speed regulation+charging time (s) 21.44875 21.52905 21.6542 21.7005 21.73855
Charging time (s) 20 20 20 20 20
Overshoot revolving speed (r/min) 1103 1159 1205 1257 1308
Instantaneous highest oil consumption (L/h) 13.55 14 14.5 16.75 16.75
Oil consumption (L/3600) 230.1988 240.5558 249.9698 270.7313 281.3122
Charge volume (kWh) 709300 736960 770720 818820 855210
Oily electricity is than (L/KWh) 0.3245 0.3264 0.3243 0.3306 0.3289
It can be seen that currently employed this method, the i.e. mode of 1200r/min, 400Nm are optimal.
3) longitudinal comparison is carried out below, and the working speed of engine is scheduled on 1200r/min, the motor torque difference of power generation It is scheduled on 350Nm, 400Nm, 450Nm, obtained data are as follows:
Motor torque (Nm) 350 400 450
Engine speed (r/min) 1200 1200 1200
Speed regulation+charging time (s) 21.8336 21.6542 21.5836
Charging time (s) 20 20 20
Overshoot revolving speed (r/min) 1205 1205 1206
Instantaneous highest oil consumption (L/h) 13.3 14.5 17.2
Oil consumption (L/3600) 232.2194 249.9698 293.47
Charge volume (kWh) 705320 770720 859730
Oily electricity is than (L/KWh) 0.3292 0.3243 0.3414
Clearer it can see, the pedestal method in longitudinal comparison is equally optimal.
4) method validation.Although needing not move through the verifying in this method according to calculated result, in order to preferably prove The accuracy of this method, and carried out several groups of intersections and compared, it is as follows:
Motor torque (Nm) 450 400 350
Engine speed (r/min) 1150 1200 1250
Speed regulation+charging time (s) 21.5887 21.6542 21.7283
Charging time (s) 20 20 20
Overshoot revolving speed (r/min) 1155 1205 1256
Instantaneous highest oil consumption (L/h) 17.6 14.5 15.6
Oil consumption (L/3600) 299.0225 249.9698 267.184
Charge volume (kWh) 815210 770720 740020
Oily electricity is than (L/KWh) 0.3668 0.3243 0.361
Increase electric generator torque, reduces power generation revolving speed, or reduce electric generator torque, increase power generation revolving speed, two All it is far longer than the optimum point found out after the oil consumption of kind method is comprehensive, with reference to Fig. 6 a and Fig. 6 b.
Finally it is noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.This The those of ordinary skill in field is it is understood that be possible to modify the technical solutions described in the foregoing embodiments or right Part of technical characteristic is equivalently replaced;These are modified or replaceed, and it does not separate the essence of the corresponding technical solution originally Invent the spirit and scope of each embodiment technical solution.

Claims (10)

1. a kind of engine working point optimization method of series parallel hybrid power vehicle characterized by comprising
Step 1, engine speed parameter and motor torque parameter are acquired;
Step 2, in the case of the engine speed parameter is constant, by changing the size of the motor torque parameter, meter Calculate each motor torque parameter and the corresponding engine oil consumption of the constant engine speed parameter and ISG motor power consumption Amount;
Step 3, in the case of the motor torque parameter constant, by changing the size of the engine speed parameter, meter Calculate each engine speed parameter and the corresponding each engine oil consumption of the constant motor torque parameter and ISG motor consumption Electricity;
Step 4, the engine oil consumption and ISG motor power consumption obtained according to the step 2, obtains lateral comparison data;
Step 5, the engine oil consumption and ISG motor power consumption obtained according to the step 3, obtains longitudinal comparison data;
Step 6, the longitudinal comparison number that the lateral comparison data and the step 5 obtained according to the step 4 obtain According to determining optimal charging work point under engine start optimal working point and engine tandem working mode.
2. the engine working point optimization method of series parallel hybrid power vehicle as described in claim 1, which is characterized in that institute It states in step 1, the engine speed parameter includes unloading revolving speed, and the motor torque parameter includes electric motor starting torque;
In step 2, the engine speed parameter further includes the unloading revolving speed, and the motor torque parameter further includes the electricity Machine detent torque;
The step 4 specifically includes:
Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each electricity Machine detent torque and the corresponding each motor torque of the constant unloading revolving speed start weight;
Step 42, each motor torque step 41 being calculated starts the corresponding motor of minimum value in weight and opens For dynamic torque as optimal electric motor starting torque, which is the lateral comparison data;
The step 5 specifically includes:
Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2 calculates each described unload Idling speed and the corresponding each unloading revolving speed of the constant electric motor starting torque start weight;
Step 52, the minimum value in each unloading revolving speed starting weight that the step 51 is calculated corresponding is unloaded into idling Speed is used as optimal unloading revolving speed, which is the longitudinal comparison data.
3. the engine working point optimization method of series parallel hybrid power vehicle as claimed in claim 2, which is characterized in that institute It states in step 41 and " calculates each electric motor starting torque and the corresponding each motor torque starting power of the constant unloading revolving speed " each unloading revolving speed and the constant corresponding each unloading of the electric motor starting torque are calculated in value " and/or the step 51 The calculation formula of revolving speed starting weight " is such as following formula (1):
H=(α fc+βpc)(1+γt+τna) (1)
In formula (1), α, β, γ and τ are weight coefficient, fcFor engine start oil consumption, pcFor ISG electric motor starting power consumption, t is Time since engine start, naFor overshoot revolving speed.
4. the engine working point optimization method of series parallel hybrid power vehicle as claimed in any one of claims 1-3, It is characterized in that, the step 6 specifically includes:
Step 61, the minimum value C in the motor torque starting weight that the step 42 obtainsαIt is obtained with the step 52 It is each it is described unloading revolving speed starting weight in minimum value LαIn the case of meeting following formula (2), the step is calculated using formula (1) The optimal unloading engine speed B ' that the 42 obtained optimal electric motor starting torque A ' and the step 52 obtain is opposite The starting weight M answered, then Cα、LαWith the minimum value min (C in Ma,La, M) and corresponding electric motor starting torque and unloading revolving speed be institute State engine start optimal working point;
|Ca-La|≤Δ (2)
Step 62, the minimum value C in the motor torque starting weight that the step 42 obtainsαIt is obtained with the step 52 It is each it is described unloading revolving speed starting weight in minimum value LαThen include the following two kinds situation in the case of meeting following formula (3):
The first situation: if CaLess than Lα, then the optimal electric motor starting torque A ' that the step 42 obtains is the engine Start the electric motor starting torque in optimal working point;Again under the premise of the optimal electric motor starting torque A ' is constant, institute is repeated Step 5 is stated, carries out longitudinal searching by changing unloading revolving speed, obtained optimal unloading revolving speed is optimal as the engine start Unloading revolving speed in operating point;
Second case: if CaGreater than Lα, then the step 52 obtains the optimal unloading engine speed B ' engine Start the unloading revolving speed in optimal working point;Again under the premise of the optimal unloading engine speed B ' is constant, repeat above-mentioned The process that S13 is provided, by changing the value of electric motor starting torque value A, repeating said steps 5, by changing electric motor starting torque Longitudinal searching is carried out, obtained optimal electric motor starting torque turns as the electric motor starting in the engine start optimal working point Square;
|Ca-La| > Δ (3)
The numerical value of formula (2) and the Δ in formula (3) is by CαAnd LαIt determines.
5. the engine working point optimization method of series parallel hybrid power vehicle as claimed in claim 4, which is characterized in that formula (2) Δ and in formula (3) meets:
Δ=5%min (Ca,La), in which: min (Ca,La) it is CαAnd LαIn minimum value.
6. the engine working point optimization method of series parallel hybrid power vehicle as described in claim 1, which is characterized in that institute It states in step 1, the engine speed parameter includes power generation revolving speed, and the motor torque parameter includes power generation torque;
In step 2, the engine speed parameter further includes the power generation revolving speed, and the motor torque parameter further includes the hair Electric torque;
The step 4 specifically includes:
Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each hair Electric revolving speed and the corresponding each electric ratio of oil of the constant power generation torque;
Step 42, minimum value corresponding power generation revolving speed of each oil electricity step 41 being calculated than in is as optimal Generate electricity revolving speed, which is the lateral comparison data;
The step 5 specifically includes:
Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each hair Electric torque and the corresponding each electric ratio of oil of the constant power generation revolving speed;
Step 52, minimum value corresponding power generation torque of each oil electricity step 51 being calculated than in is as optimal Generate electricity torque, which is the longitudinal comparison data.
7. the engine working point optimization method of series parallel hybrid power vehicle as claimed in claim 6, which is characterized in that institute State " calculating each power generation revolving speed and the corresponding each electric ratio of oil of the constant power generation torque " and/or the step in step 41 The calculation formula of " calculating each power generation torque and the corresponding each electric ratio of oil of the constant power generation revolving speed " in rapid 51 is such as Following formula (5):
In formula (5), fcFor fixed time period t intrinsic motivation oil consumption, pcFor ISG electric power generation amount in fixed time period t.
8. the engine working point optimization method of the series parallel hybrid power vehicle as described in any one of claim 1,6 and 7, It is characterized in that, the step 6 specifically includes:
Step 61, the first optimal oily electricity ratio η obtained in the step 42nThe the second optimal electric ratio of oil obtained with the step 52 For ηTIn the case of meeting following formula (6), the optimal power generation revolving speed ne ' and institute that the step 42 obtains are calculated using formula (5) State the optimal power generation torque T that step 52 obtainsg' corresponding oil electricity is than η, then the first optimal oily electricity ratio ηn, the second optimal oil Electricity is than being ηTWith the minimum value min (η in ηnT, η) and corresponding power generation torque and power generation revolving speed be the engine tandem working Optimal charging work point under mode;
nT|≤Δ (6)
Step 62, in the first optimal oily electricity ratio ηnWith the second optimal oil electricity than being ηTIt then include such as in the case of meeting following formula (7) Lower two kinds of situations:
The first situation: if ηnLess than ηT, then the step 42 obtains optimal power generation revolving speed ne' it is engine series connection work Power generation revolving speed under operation mode in optimal charging work point;Again in the optimal power generation revolving speed ne' it is constant under the premise of, repeat institute Step 5 is stated, carries out longitudinal searching by changing power generation torque, obtained optimal power generation torque is as the engine tandem working Power generation torque under mode in optimal charging work point;
Second case: if ηnGreater than ηT, then the step 52 obtains the optimal power generation torque Tg' it is the engine string Join the power generation torque under operating mode in optimal charging work point;Again under the premise of the optimal power generation torque is constant, repeat The step 5 carries out longitudinal searching by changing power generation revolving speed, and obtained optimal power generation revolving speed is as engine series connection work Power generation revolving speed under operation mode in optimal charging work point;
nT| > Δ (7)
The numerical value of formula (6) and the Δ in formula (7) is by ηnAnd ηTIt determines.
9. the engine working point optimization method of series parallel hybrid power vehicle as claimed in claim 8, which is characterized in that formula (6) Δ and in formula (7) meets:
Δ=5%min (ηnT), in which: min (ηnT) it is ηnAnd ηTIn minimum value.
10. the engine working point optimization method of series parallel hybrid power vehicle as claimed in claim 5, which is characterized in that In the step 1, the engine speed parameter further includes power generation revolving speed, and the motor torque parameter further includes power generation torque;
In step 2, the engine speed parameter further includes the power generation revolving speed, and the motor torque parameter further includes the hair Electric torque;
The step 4 specifically includes:
Step 41, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each hair Electric revolving speed and the corresponding each electric ratio of oil of the constant power generation torque;
Step 42, minimum value corresponding power generation revolving speed of each oil electricity step 41 being calculated than in is as optimal Generate electricity revolving speed, which is the lateral comparison data;
The step 5 specifically includes:
Step 51, each engine oil consumption and ISG motor power consumption obtained according to the step 2, calculates each hair Electric torque and the corresponding each electric ratio of oil of the constant power generation revolving speed;
Step 52, minimum value corresponding power generation torque of each oil electricity step 51 being calculated than in is as optimal Generate electricity torque, which is the longitudinal comparison data;
The step 6 specifically includes:
Step 61, the first optimal oily electricity ratio η obtained in the step 42nThe the second optimal electric ratio of oil obtained with the step 52 For ηTIn the case of meeting following formula (6), the optimal power generation revolving speed ne ' and institute that the step 42 obtains are calculated using formula (5) State the optimal power generation torque T that step 52 obtainsg' corresponding oil electricity is than η, then the first optimal oily electricity ratio ηn, the second optimal oil Electricity is than being ηTWith the minimum value min (η in ηnT, η) and corresponding power generation torque and power generation revolving speed be the engine tandem working Optimal charging work point under mode;
nT|≤Δ (6)
Step 62, in the first optimal oily electricity ratio ηnWith the second optimal oil electricity than being ηTIt then include such as in the case of meeting following formula (7) Lower two kinds of situations:
The first situation: if ηnLess than ηT, then the step 42 obtains optimal power generation revolving speed ne' it is engine series connection work Power generation revolving speed under operation mode in optimal charging work point;Again under the premise of the optimal power generation revolving speed ne ' is constant, institute is repeated Step 5 is stated, carries out longitudinal searching by changing power generation torque, obtained optimal power generation torque is as the engine tandem working Power generation torque under mode in optimal charging work point;
Second case: if ηnGreater than ηT, then the step 52 obtains the optimal power generation torque Tg' it is the engine string Join the power generation torque under operating mode in optimal charging work point;Again under the premise of the optimal power generation torque is constant, repeat The step 5 carries out longitudinal searching by changing power generation revolving speed, and obtained optimal power generation revolving speed is as engine series connection work Power generation revolving speed under operation mode in optimal charging work point;
nT| > Δ (7)
The numerical value of formula (6) and the Δ in formula (7) is by ηnAnd ηTIt determines.
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