CN110568289B - Simulation experiment method for urban circulation working condition of parallel type oil-electricity hybrid electric vehicle - Google Patents

Simulation experiment method for urban circulation working condition of parallel type oil-electricity hybrid electric vehicle Download PDF

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CN110568289B
CN110568289B CN201910878093.0A CN201910878093A CN110568289B CN 110568289 B CN110568289 B CN 110568289B CN 201910878093 A CN201910878093 A CN 201910878093A CN 110568289 B CN110568289 B CN 110568289B
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electric
gearbox
electric hybrid
torque
vehicle
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CN110568289A (en
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杨树军
王浩
王波
唐先智
张璐
田霖
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Yanshan University
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Yanshan University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/007Wheeled or endless-tracked vehicles
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005Testing of electric installations on transport means
    • G01R31/006Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385Arrangements for measuring battery or accumulator variables
    • 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

Abstract

The invention relates to the technical field of oil-electricity hybrid power, and discloses a simulation experiment method and a test device for urban circulation working conditions of a parallel type oil-electricity hybrid power vehicle, wherein a control motor of a laboratory bench simulates the speed change of the parallel type oil-electricity hybrid power vehicle under the urban circulation working conditions; the physical element truly reflects the working states of the electric power module and the gearbox of the parallel oil-electricity hybrid electric vehicle; and the upper computer simulates the working state of the automobile engine according to the real-time working state of the electric power module, so that the working state of the parallel oil-electric hybrid automobile under the urban circulation working condition is obtained. The test bed comprises a battery, an electric hybrid power gearbox controller, an electric hybrid power gearbox and a dynamometer motor.

Description

Simulation experiment method for urban circulation working condition of parallel type oil-electricity hybrid electric vehicle
Technical Field
The invention relates to the technical field of oil-electricity hybrid power, in particular to a simulation experiment method and a test device for urban circulation working conditions of a parallel type oil-electricity hybrid power automobile.
Background
The increasingly reduced petroleum resources are being collected and the living environment of human being is being protected, which are two major problems that need to be solved urgently in the human society, and the development of hybrid electric vehicles and electric vehicles is accelerated. Compared with the traditional fuel oil automobile, the pure electric automobile has the characteristics of cleanness, silence and high efficiency, but the marketization of the pure electric automobile needs a longer period of time due to the limitation of the battery technology. Therefore, a plurality of automobile manufacturers in the world put emphasis on research and development of hybrid electric vehicles compared with pure electric vehicles, although zero emission of the hybrid electric vehicles cannot be realized, the advantages of high efficiency and low emission of the pure electric vehicles can be achieved by adopting a reasonable control strategy, the characteristics of powerful power and long driving mileage of the traditional fuel oil vehicles can be exerted, the existing traditional automobile technology and the existing public infrastructure can be well utilized, and the automobile type meets the practical needs of the society. Compared with the traditional internal combustion engine automobile, the hybrid electric automobile can improve the fuel economy and reduce the emission; the energy-saving and environment-friendly functions are realized by combining the existing power sources, and the energy-saving and environment-friendly functions can be quickly put into actual production; the auxiliary power is provided, the limit of the driving range of the pure electric vehicle is broken through, and the driving range of the pure electric vehicle can be comparable to that of the traditional fuel oil vehicle; compared with a pure electric vehicle, the battery capacity is smaller, and the corresponding weight and volume are much smaller; through adopting reasonable control strategy, auxiliary power can charge to the battery for hybrid vehicle need not to park and charges, has reduced the maintenance work load of battery simultaneously.
The oil-electricity hybrid electric vehicle is a complex aggregate of machinery and electric appliances, and if a large number of real vehicle tests are directly carried out by building real vehicles in the early stage of development of the whole vehicle, a large amount of manpower, material resources and financial resources are consumed, and the design and development cycle is prolonged; the characteristics of system components are difficult to be completely embodied by adopting computer simulation completely, and the result is greatly different from the actual result. Therefore, in the research and development of the oil-electric hybrid electric vehicle, it is necessary to develop a method for performing a semi-physical experiment by combining computer technology.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a simulation experiment method and a test device for urban circulation working conditions of a parallel type oil-electricity hybrid electric vehicle, which simulate the urban circulation working conditions of the parallel type oil-electricity hybrid electric vehicle on an experiment table.
The technical scheme of the invention is as follows:
a test device for a simulation experiment method of a parallel type oil-electricity hybrid electric vehicle comprises a battery, an electric hybrid electric transmission controller, an electric hybrid electric transmission, a dynamometer, a motor and a sensor; the battery is sequentially connected with the electric hybrid power gearbox controller and the electric input end of the electric hybrid power gearbox, and the output end of the electric hybrid power gearbox is sequentially connected with the dynamometer and the motor; the mechanical input end of the electric hybrid power gearbox is empty, and the electric hybrid power gearbox comprises an electric power module and a gearbox; the gear in the electric hybrid power gearbox is acquired by an electric hybrid power gearbox controller, the rotating speed of the output end of the electric hybrid power gearbox is acquired by a sensor, and the state of the battery is acquired by the sensor or calculated.
Preferably, when the hybrid electric vehicle is in a braking mode, the electric power module in the electric hybrid gearbox functions as a generator to convert kinetic energy into electric energy to form a resistance effect on the rotation of the electric hybrid gearbox, and the electric power module provides braking torque; when the oil-electric hybrid electric vehicle is in a driving mode, the electric power module in the electric hybrid electric gearbox plays a role of a motor, electric energy is converted into kinetic energy, a driving effect on rotation of the electric hybrid electric gearbox is formed, and the electric power module provides driving torque.
Preferably, the sensor comprises a first sensor and a second sensor; the battery is connected with a first sensor, and the first sensor acquires the state of the battery; the second sensor is connected to the output end of the electric hybrid power gearbox, and the rotating speed of the output end of the electric hybrid power gearbox is collected through the second sensor.
Preferably, the second sensor further comprises a torque sensor configured to capture torque that can be provided by an electric power module within the electric hybrid transmission.
A simulation experiment method for urban circulation working conditions of a parallel type oil-electricity hybrid electric vehicle specifically comprises the following steps:
s1: converting the speed of the gasoline-electric hybrid electric vehicle under the urban circulation working condition into the rotating speed of the output end of the vehicle gearbox so as to be simulated by a motor;
s2: determining the real-time rotating speed of an engine according to the real-time rotating speed of the output end of the automobile gearbox and the current gear of the electric hybrid gearbox collected by the electric hybrid gearbox controller; the gear change of the electric hybrid power gearbox follows the gear change rule of the electric hybrid power gearbox;
s3: according to the speed u of the gasoline-electric hybrid electric vehicle under the urban circulation working conditionaCalculating the given angular acceleration of the output end of the electric hybrid power gearbox, and further judging a driving mode, a braking mode, a parking mode and a constant speed driving mode of the automobile according to the given angular acceleration of the output end of the electric hybrid power gearbox;
s4: calculating the required torque of the output end of the electric hybrid power gearbox according to the given acceleration of the automobile;
s5: adjusting the electric hybrid transmission controller based on the current battery state and the requested torque at the output of the electric hybrid transmission to control the torque provided by the electric power module in the electric hybrid transmission;
s6: determining real-time driving torque of an engine in a driving state or mechanical braking torque in a braking state according to the required torque at the output end of the electric hybrid power gearbox and the torque which can be provided by the electric power module;
s7: and determining the oil consumption of the engine and obtaining the oil saving rate according to the real-time rotating speed and torque of the engine and the universal characteristic curve of the engine.
Preferably, in step S6, when the vehicle is in the driving mode, the mechanical braking torque is zero, and the real-time torque of the engine is calculated by the torque that the electric power module can provide, the driving torque required by the output end of the electric hybrid transmission in the driving mode, and the gear ratio of the electric hybrid transmission;
when the automobile is in a braking mode, the real-time torque of the engine is zero, and the mechanical braking torque is calculated by the torque which can be provided by the electric power module, the braking torque required by the output end of the electric hybrid power speed change line in the braking mode and the transmission ratio of the electric hybrid power gearbox.
Preferably, in the braking process of the automobile, when the braking strength is greater than 0.7, the automobile is judged to be emergency braking, and at the moment, the braking is purely mechanical braking, the electric power module does not work, and the braking torque is not provided; when the braking torque required by the vehicle is less than or equal to the braking torque which can be provided by the electric power module, the electric hybrid gearbox controller is adjusted to reasonably control the braking torque provided by the electric power module according to the requirement of the system intensity.
Preferably, during braking of the vehicle, the electric power module converts kinetic energy into electric energy to be stored in the battery, and if the electric power of the battery reaches a saturated state, the battery is not charged.
Preferably, the real-time torque of the engine is obtained by subtracting the driving torque provided by the electrodynamic force module from the required driving torque at the output end of the electric hybrid gearbox through the transmission ratio calculation of the gearbox, when the driving torque provided by the electrodynamic force module can meet the required driving torque at the output end of the electric hybrid gearbox, the driving torque is provided by the electrodynamic force module, and the real-time torque of the engine is zero; the mechanical braking torque is obtained by subtracting the braking torque which can be provided by the electrodynamic force module and is calculated by the transmission ratio of the electric hybrid gearbox 3 from the braking torque at the output end of the electric hybrid gearbox, and when the braking torque provided by the electrodynamic force module can meet the braking torque required at the output end of the electric hybrid gearbox, the braking torque is provided by the electrodynamic force module, and the mechanical braking torque is zero.
Compared with the prior art, the invention has the beneficial effects that:
1. the simulation experiment method for urban circulation working conditions of the parallel type oil-electricity hybrid electric vehicle is used in the development stage of the oil-electricity hybrid electric vehicle, and can improve the research and development efficiency and reduce the research and development cost.
2. The simulation experiment method for urban circulation working conditions of the parallel type oil-electricity hybrid electric vehicle can be used for researching control strategies and determining the optimal control strategy.
3. The simulation experiment method for urban circulation conditions of the parallel type oil-electricity hybrid electric vehicle can accurately simulate the actual running condition of the oil-electricity hybrid electric vehicle.
4. Compared with other experimental methods, the parallel-connection type oil-electricity hybrid electric vehicle urban circulation working condition simulation experimental method has the obvious advantages of high simulation precision, low test cost, small occupied space and the like.
Drawings
The invention is further described with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an experimental bench of a simulation experiment method for urban circulation conditions of a parallel type oil-electric hybrid electric vehicle according to an embodiment of the invention.
In the figure: 1. the system comprises a battery, 2 an electric hybrid power gearbox controller, 3 an electric hybrid power gearbox, 4 a dynamometer and 5 a motor.
Detailed Description
Features of exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
According to the invention, through an experimental table, as shown in fig. 1, a motor is controlled in a constant-rotating-speed control mode to simulate the speed change of a parallel type oil-electricity hybrid electric vehicle under the urban circulation working condition; the working state of the parallel oil-electricity hybrid electric vehicle is truly reflected through a material object element; and the upper computer simulates the working state of the automobile engine according to the real-time working state of each element, so that the working state of the parallel oil-electric hybrid automobile under the urban circulation working condition is obtained.
The test stand according to the embodiment of the invention comprises a battery 1, an electric hybrid gearbox controller 2, an electric hybrid gearbox 3, a dynamometer 4, a motor 5 and sensors. The battery 1 is connected with the electric hybrid power gearbox controller 2 and the electric input end of the electric hybrid power gearbox 3 in sequence, the mechanical input end of the electric hybrid power gearbox 3 is empty, and the output end of the electric hybrid power gearbox 3 is connected with the dynamometer 4 and the motor 5 in sequence.
Specifically, the battery 1 is connected with an electric hybrid gearbox controller 2, the electric hybrid gearbox controller 2 is connected with an electric input end of an electric hybrid gearbox 3, an output end of the electric hybrid gearbox 3 is connected with an input end of a dynamometer 4, and an output end of the dynamometer 4 is connected with a motor 5; when the kinetic energy is converted into electric energy, an electric power module in the electric hybrid power gearbox is used as a generator; an electric power module within the electric hybrid transmission acts as a motor when electrical energy is converted to kinetic energy. Preferably, the electric machine 5 is connected to the output of the electric hybrid gearbox 3.
Preferably, when the hybrid electric vehicle is in a braking mode, the electric power module in the electric hybrid gearbox plays a role of a generator to convert kinetic energy into electric energy to form a resistance effect on the rotation of the electric hybrid gearbox, and the electric power module provides braking torque; when the oil-electricity hybrid electric vehicle is in a driving mode, the electric power module in the electric hybrid electric gearbox plays a role of a motor, electric energy is converted into kinetic energy, a driving effect on rotation of the electric hybrid electric gearbox is formed, and the electric power module provides driving torque.
Preferably, the sensor comprises a first sensor and a second sensor.
The electric power of the battery 1 and the rotating speed of the output end of the electric hybrid power gearbox 3 are acquired by various sensors. Specifically, the battery is connected with a first sensor, and the first sensor collects the state of the battery; the second sensor is connected to the electric hybrid gearbox, for example the rotational speed of the output of the electric hybrid gearbox is picked up by a third sensor.
Preferably, the second sensor further comprises a torque sensor configured to acquire the torque that the electrodynamic force module is capable of providing.
The speed change of the gasoline-electric hybrid electric vehicle under the urban circulation working condition is simulated through the motor 5, specifically, the speed of the vehicle is converted into the rotating speed of the output end of the gearbox through wheels and a main reducer, and the upper computer controls the motor of the experiment table to operate at the rotating speed to realize the simulation of the vehicle; the rotational speed of the output of the vehicle gearbox is equal to the rotational speed of the output of the electric hybrid gearbox 3.
According to the speed of the gasoline-electric hybrid electric vehicle under the urban circulation working condition, the rotating speed of the output end of the gearbox of the vehicle, namely the rotating speed of the output end of the electric hybrid electric gearbox 3 is obtained. The experiment table controls the motor 5 to operate according to the preset rotating speed in a preset constant rotating speed control mode so as to simulate the working state of the gasoline-electric hybrid electric vehicle under the urban circulation working condition, and the upper computer of the experiment table combines the rotating speed of the output end of the vehicle gearbox with the transmission ratio of the gearbox to obtain the working state of the vehicle, such as the real-time rotating speed of an engine.
The test bed is an experimental device for simulating urban circulation working conditions of the parallel type oil-electricity hybrid electric vehicle, and controls a motor to simulate speed change of the parallel type oil-electricity hybrid electric vehicle under the urban circulation working conditions in a constant rotating speed control mode through the test bed; the working state of the electric power module of the parallel oil-electric hybrid electric vehicle is truly reflected by physical elements such as a battery, an electric hybrid gearbox controller and an electric hybrid gearbox; and the upper computer simulates the working state of the automobile engine according to the real-time working state of the electric hybrid power gearbox, so that the working state of the parallel type oil-electric hybrid power automobile under the urban circulation working condition is obtained.
Preferably, the test stand includes a battery, an electric hybrid transmission controller, an electric hybrid transmission, a dynamometer, and an electric machine. The battery is connected with the electric hybrid power gearbox controller and the electric input end of the electric hybrid power gearbox in sequence, the mechanical input end of the electric hybrid power gearbox is empty, and the output end of the electric hybrid power gearbox is connected with the dynamometer and the motor in sequence.
Preferably, the speed change of the gasoline-electric hybrid electric vehicle under the urban circulation working condition is simulated through the motor, the speed of the vehicle is converted into the rotating speed of the output end of the gearbox through the wheels and the main reducer, and the upper computer controls the motor of the experiment table to operate at the rotating speed to realize the simulation of the vehicle.
The real object element truly reflects the working state of the power module on the automobile, namely, the state of the battery is acquired by the sensor in real time; judging the working mode of the automobile according to the angular acceleration of the output end of the gearbox obtained by converting the speed, wherein when the automobile is in a driving mode, the electrodynamic force module plays a role of a motor to convert the electric energy in the battery into kinetic energy, and at the moment, the electrodynamic force module provides driving torque; the torque variation provided by the electric power module is controlled by the electric hybrid transmission controller 2 based on the current electric power of the battery 1 and the torque demand at the output of the electric hybrid transmission 3.
The upper computer simulates the working state of the automobile engine according to the real-time working state of the electric power module, namely, the transmission ratio of the gearbox is acquired by an electric hybrid gearbox controller, the rotating speed of the engine is calculated according to the acquired real-time rotating speed of the output end of the gearbox and the transmission ratio of the gearbox, the torque of the engine is calculated according to the required driving torque of the output end of the gearbox, the driving torque provided by the electric power module and the transmission ratio of the gearbox, and the mechanical braking torque of the automobile is calculated according to the required braking torque of the output end of the gearbox, the braking torque provided by the electric power module and the transmission ratio of the gearbox.
An electric hybrid transmission includes an electric power module and a transmission. When the electric power module is in a driving mode, the electric power module plays a role of a motor, converts electric energy into kinetic energy, forms a driving effect on the rotation of the input end of the gearbox, and drives the gearbox together with the engine; when in the braking mode, the electric power module functions as a generator to convert kinetic energy into electrical energy, creating a resistive effect on the rotation of the transmission input.
The invention discloses a simulation experiment method for urban circulation working conditions of a parallel type oil-electricity hybrid electric vehicle, which specifically comprises the following steps:
s1: converting the speed of the gasoline-electric hybrid electric vehicle under the urban circulation working condition into the rotating speed of the output end of the vehicle gearbox so as to be simulated by the motor 5;
preferably, the formula for converting the speed of the gasoline-electric hybrid vehicle under the urban cycle condition into the rotating speed of the output end of the vehicle gearbox is as follows,
in the formula, n is the given rotating speed of the output end of the electric hybrid power gearbox, namely the given rotating speed of the motor 5; u. ofaThe theoretical speed of the urban cycle working condition; i.e. i0Is the transmission ratio of a main speed reducer of an automobile; r is the wheel radius;
s2: determining the real-time rotating speed of an automobile engine according to the real-time rotating speed of the output end of the automobile gearbox and the transmission ratio of the transmission;
preferably, the real-time rotating speed of the output end of the automobile gearbox is measured through a rotating speed sensor, the current transmission ratio of the gearbox is acquired through an electric hybrid gearbox controller, the real-time rotating speed of the engine is calculated through the following formula,
ne=nsig
in the formula, neThe real-time rotating speed of the engine; n issThe real-time rotating speed of the output end of the gearbox; i.e. igIs the transmission ratio of the gearbox;
s3: according to the speed u of the gasoline-electric hybrid electric vehicle under the urban circulation working conditionaCalculating the given angular acceleration of the output end of the automobile gearbox, and judging a driving mode, a braking mode, a parking mode and a constant-speed driving mode of the automobile according to the given angular acceleration of the output end of the automobile gearbox;
preferably, the expression for calculating a given acceleration of the vehicle is as follows,
in the formula, a isA given acceleration of the vehicle; u. ofaThe method comprises the following steps of (1) setting the speed of the gasoline-electric hybrid electric vehicle under the urban circulation working condition, namely the given speed; u. ofa n-1△ t is the time interval of two given vehicle speeds;
a given angular acceleration at the output of the vehicle transmission is calculated by the following formula,
where the given angular acceleration of the output of the gearbox is used.
Judging the running mode of the automobile by the given speed and the given angular acceleration of the output end of the gearbox:
when the given angular acceleration is larger than zero, judging that the oil-electric hybrid electric vehicle is in a driving mode;
when the given angular acceleration is less than zero, judging that the oil-electric hybrid electric vehicle is in a braking mode;
when the given angular acceleration is equal to zero and the given vehicle speed is equal to zero, judging that the oil-electric hybrid electric vehicle is in a parking mode;
when the given angular acceleration is equal to zero and the given vehicle speed is not equal to zero, the oil-electric hybrid vehicle is judged to be in a constant-speed driving mode.
S4: calculating the required torque at the output end of the electric hybrid power gearbox 3 according to the given acceleration of the automobile;
preferably, the calculation expression of the required torque at the output of the electric hybrid transmission is as follows,
in the formula, Treq-qThe driving torque required by the output end of the electric hybrid gearbox 3 in the driving mode; t isreq-zThe braking torque required by the output end of the electric hybrid gearbox 3 in the braking mode; m is the mass of the automobile; f is a rolling resistance coefficient; cDIs the air resistance coefficient; a is the frontal area of the automobile;
s5: the electric hybrid transmission controller 2 is adjusted according to the current state of the battery 1 and the required torque at the output of the electric hybrid transmission 3 to control the torque provided by the electric power module.
Preferably, the state of the battery, for example, the voltage of the battery, is collected in real time by the first sensor.
S6: determining real-time driving torque of an engine in a driving state or mechanical braking torque in a braking state according to the required torque at the output end of the electric hybrid gearbox 3, the torque which can be provided by the electric power module and the transmission ratio of the gearbox;
when the automobile is in a driving mode, the mechanical braking torque is zero, and the real-time torque of the engine is calculated by the torque which can be provided by the electric power module, the driving torque required by the output end of the electric hybrid power gearbox 3 in the driving mode and the transmission ratio of the gearbox.
The real-time torque of the engine in the drive mode is calculated by the following formula,
in the formula, TeIs the real-time torque of the engine; t ispTorque that the electrodynamic force module can provide is collected for the torque sensor.
When the automobile is in a braking mode, the real-time torque of the engine is zero, and the mechanical braking torque is calculated by the torque which can be provided by the electric power module, the braking torque required by the output end of the electric hybrid power gearbox 3 in the braking mode and the transmission ratio of the gearbox.
The mechanical braking torque in the braking mode is calculated by the following formula,
Tm=Treq-z-Tpig
in the formula, TmIs a mechanical braking torque; t ispTorque which can be provided by an electrodynamic force module and is collected by a torque sensor; t isreq-zThe braking torque required by the output end of the electric hybrid gearbox 3 in the braking mode;
s7: and determining the oil consumption of the engine and obtaining the oil saving rate according to the real-time rotating speed and torque of the engine and the universal characteristic curve of the engine.
Preferably, a corresponding engine universal characteristic data table is checked through the real-time rotating speed and the real-time torque of the engine to obtain the fuel consumption rate of the engine;
the fuel consumption of the engine is calculated by the following formula,
wherein Q is the fuel consumption of the engine; beIs the fuel consumption rate of the engine; t is time.
The oil saving rate is calculated by the following formula,
wherein η is the oil saving rate, QcThe fuel consumption of the traditional vehicle under the urban circulation working condition is realized.
In the braking process of the automobile, when the braking strength is greater than 0.7, the automobile is judged to be emergency braking, at the moment, the braking is purely mechanical braking, the electric power module does not work, and the braking torque is not provided; when the vehicle demand braking torque is less than or equal to the braking torque that the electric power module can provide, the electric hybrid transmission controller 2 is adjusted to reasonably control the magnitude of the braking torque provided by the electric power module according to the requirements of the institutional strength.
During the braking process of the automobile, the kinetic energy is converted into electric energy by the electric power module and stored in the battery 1, and if the electric power of the battery 1 reaches a saturated state, the battery 1 is not charged.
The real-time torque of the engine is obtained by subtracting the driving torque provided by the electrodynamic force module from the required driving torque at the output end of the electric hybrid gearbox 3 through the transmission ratio calculation of the gearbox, when the driving torque provided by the electrodynamic force module can meet the required driving torque at the output end of the electric hybrid gearbox 3, the driving torque is provided by the electrodynamic force module, and the real-time torque of the engine is zero; the mechanical braking torque is obtained by subtracting the braking torque which can be provided by the electrodynamic force module and is calculated by the transmission ratio of the electric hybrid gearbox 3 from the braking torque at the output end of the electric hybrid gearbox 3, and when the braking torque provided by the electrodynamic force module can meet the braking torque required at the output end of the electric hybrid gearbox 3, the braking torque is provided by the electrodynamic force module, and the mechanical braking torque is zero.
The universal characteristic curve of the engine can be checked according to the real-time torque and the real-time rotating speed of the engine, the fuel consumption rate of the engine at the current moment is obtained, the fuel consumption of the engine under the whole urban circulation working condition is obtained through superposition, and the fuel saving rate of the gasoline-electric hybrid electric vehicle can be obtained by comparing the fuel consumption of the traditional vehicle under the urban circulation working condition.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. A simulation experiment method for urban circulation working conditions of a parallel type oil-electricity hybrid electric vehicle is characterized in that an experiment device used for the simulation experiment method for urban circulation working conditions of the parallel type oil-electricity hybrid electric vehicle comprises a battery, an electric hybrid power gearbox controller, an electric hybrid power gearbox, a dynamometer, a motor and a sensor; the battery is sequentially connected with the electric hybrid power gearbox controller and the electric input end of the electric hybrid power gearbox, and the output end of the electric hybrid power gearbox is sequentially connected with the dynamometer and the motor; the mechanical input end of the electric hybrid power gearbox is empty, and the electric hybrid power gearbox comprises an electric power module and a gearbox; the electric hybrid power gearbox controller collects gears in the electric hybrid power gearbox; acquiring the rotating speed of the output end of the electric hybrid power gearbox and the state of the battery through the sensor, and measuring the rotating speed and the state of the battery through the sensor;
the simulation experiment method specifically comprises the following steps:
s1: converting the speed of the gasoline-electric hybrid electric vehicle under the urban circulation working condition into the rotating speed of the output end of the vehicle gearbox so as to be simulated by a motor;
s2: determining the real-time rotating speed of an engine according to the real-time rotating speed of the output end of the automobile gearbox and the current gear of the electric hybrid gearbox collected by the electric hybrid gearbox controller; the gear change of the electric hybrid power gearbox follows the gear change rule of the electric hybrid power gearbox;
s3: calculating the given angular acceleration of the output end of the electric hybrid power gearbox according to the speed of the gasoline-electric hybrid power automobile under the urban circulation working condition, and further judging the driving mode, the braking mode, the parking mode and the constant speed running mode of the automobile according to the given angular acceleration of the output end of the electric hybrid power gearbox;
s4: calculating the required torque of the output end of the electric hybrid power gearbox according to the given acceleration of the automobile;
s5: adjusting the electric hybrid transmission controller based on the current battery state and the requested torque at the output of the electric hybrid transmission to control the torque provided by the electric power module in the electric hybrid transmission;
s6: determining real-time driving torque of an engine in a driving state or mechanical braking torque in a braking state according to the required torque at the output end of the electric hybrid power gearbox and the torque which can be provided by the electric power module;
s7: and determining the oil consumption of the engine and obtaining the oil saving rate according to the real-time rotating speed and torque of the engine and the universal characteristic curve of the engine.
2. A parallel type oil-electric hybrid vehicle urban cycle working condition simulation experiment method according to claim 1, wherein when the oil-electric hybrid vehicle is in a braking mode, an electric power module in the electric hybrid transmission functions as a generator to convert kinetic energy into electric energy to form a resistance effect on rotation of the electric hybrid transmission, and the electric power module provides a braking torque; when the oil-electric hybrid electric vehicle is in a driving mode, the electric power module in the electric hybrid electric gearbox plays a role of a motor, electric energy is converted into kinetic energy, a driving effect on rotation of the electric hybrid electric gearbox is formed, and the electric power module provides driving torque.
3. A parallel type oil-electric hybrid vehicle city cycle condition simulation experiment method according to claim 2, wherein the sensors include a first sensor and a second sensor; the battery is connected with a first sensor, and the first sensor acquires the state of the battery; the second sensor is connected to the output end of the electric hybrid power gearbox, and the rotating speed of the output end of the electric hybrid power gearbox is collected through the second sensor.
4. A parallel hybrid electric vehicle city cycle simulation experiment method as set forth in claim 3, wherein said second sensor further comprises a torque sensor configured to capture torque available from an electric power module within the electric hybrid transmission.
5. A parallel type oil-electric hybrid vehicle city cycle condition simulation experiment method according to claim 1, wherein in step S6, when the vehicle is in a driving mode, the mechanical braking torque is zero, and the real-time torque of the engine is calculated from the torque that the electric power module can provide and the driving torque that the output end of the electric hybrid transmission requires in the driving mode;
when the automobile is in a braking mode, the real-time torque of the engine is zero, and the mechanical braking torque is calculated by the torque provided by the electric hybrid power module, the braking torque required by the output end of the electric hybrid power gearbox in the braking mode and the transmission ratio of the gearbox.
6. A parallel type oil-electric hybrid vehicle city cycle condition simulation experiment method according to claim 5, characterized in that in the vehicle braking process, when the braking intensity is greater than 0.7, the vehicle is judged to be emergency braking, at this time, the vehicle is purely mechanical braking, the electric power module does not work, and no braking torque is provided; when the braking torque required by the vehicle is less than or equal to the braking torque which can be provided by the electric power module, the electric hybrid gearbox controller is adjusted to reasonably control the braking torque provided by the electric power module according to the requirement of the system intensity.
7. A parallel type oil-electric hybrid vehicle city cycle condition simulation experiment method according to claim 6, wherein during vehicle braking, the electric power module converts kinetic energy into electric energy to be stored in the battery, and if the electric power of the battery reaches a saturation state, the battery is not charged any more.
8. A parallel type oil-electric hybrid vehicle urban circulation condition simulation experiment method according to claim 7, wherein the real-time torque of the engine is obtained by subtracting the driving torque provided by the electrodynamic force module from the required driving torque at the output end of the electric hybrid gearbox through the transmission ratio calculation of the gearbox, when the driving torque provided by the electrodynamic force module can meet the required driving torque at the output end of the electric hybrid gearbox, the driving torque is provided by the electrodynamic force module, and the real-time torque of the engine is zero; the mechanical braking torque is obtained by subtracting the braking torque which can be provided by the electrodynamic force module and is calculated through the transmission ratio of the electric hybrid gearbox from the braking torque at the output end of the electric hybrid gearbox, when the braking torque provided by the electrodynamic force module can meet the braking torque required at the output end of the electric hybrid gearbox, the braking torque is provided by the electrodynamic force module, and the mechanical braking torque is zero.
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