CN110702422A - Electric automobile driving range simulation measuring and calculating method - Google Patents

Abstract

The invention discloses a method for simulating and calculating the driving range of an electric automobile, and belongs to the technical field of electric automobiles. The method comprises the following steps: preparing a test vehicle, adjusting the mass of the test vehicle to a preset test mass, cutting off the braking energy recovery function, mounting a motor vehicle road tester on the test vehicle, and performing a sliding test on the test vehicle on a horizontal asphalt pavement; performing sliding test and data acquisition, wherein a test vehicle starts to slide from 100km/h, the sliding time corresponding to the speed variation delta V every 5km/h is taken in the process until the sliding speed of the vehicle is 0km/h, and the bidirectional 6-time sliding test is performed and data is recorded; and analyzing the data effectiveness to obtain the theoretical driving range data of the test vehicle. The invention can effectively simulate and measure various mass configuration conditions of the developed vehicle, obtain the theoretical driving range parameter of the vehicle in time and provide reliable theoretical driving range data for the development of the electric automobile.

Description

Electric automobile driving range simulation measuring and calculating method

The technical field is as follows:

the invention relates to a method for simulating and calculating the driving range of an electric automobile, and belongs to the technical field of electric automobiles.

Background art:

in the development stage of the electric automobile, development targets such as parameters of total energy of the battery, servicing quality and the like need to be formulated according to theoretical driving range data of the automobile type. However, in the actual development process, due to the restrictions of the development period, development expenditure, test conditions and the like, theoretical driving range data cannot be obtained timely, effectively and at low cost, so that a new simulation measurement and calculation method is needed.

The invention content is as follows:

the invention provides a method for simulating and calculating the driving range of an electric vehicle, aiming at solving the problems in the prior art.

The technical scheme adopted by the invention is as follows: a method for simulating and calculating the driving range of an electric automobile is characterized by comprising the following steps: the method comprises the following steps:

firstly, preparing a test vehicle, adjusting the mass of the test vehicle to a preset test mass, cutting off the braking energy recovery function, installing a motor vehicle road tester on the test vehicle, and driving the test vehicle on a horizontal asphalt pavement for sliding test;

secondly, performing sliding test and data acquisition, wherein a test vehicle starts sliding from 100km/h, the sliding time corresponding to the vehicle speed variation delta V every 5km/h is taken in the process until the vehicle sliding speed is 0km/h, and the two-way sliding test is performed for 6 times and data is recorded;

thirdly, after the data effectiveness is analyzed, fitting is carried out according to the sliding resistance

Wherein M is sliding mass; m' is the equivalent mass of the rotating part; Δ V: calculating a resistance point every 10km/h according to the vehicle speed variation; Δ T: fitting to obtain a test vehicle driving resistance model corresponding to the time interval of the vehicle speed variation, and calculating the model according to the driving range of the constant speed method

Wherein: w: total battery energy (J); eta 1: the utilization rate of the battery energy; eta 2: efficiency of conversion of electrical energy to mechanical energy; s: a driving range which can be continued at a prescribed constant driving speed; f: and according to the running resistance under the specified constant speed, combining the two models to obtain the theoretical driving range data of the test vehicle.

The invention has the following beneficial effects: the method has the advantages of simple operation method, high measuring and calculating efficiency and low use cost, can effectively simulate and calculate various mass configuration conditions of the developed vehicle, obtains the theoretical driving range parameters of the vehicle in time, and provides reliable theoretical driving range data for the development of the electric automobile.

The specific implementation mode is as follows:

the invention relates to a method for simulating and measuring the driving range of an electric vehicle, which comprises the following steps:

firstly, preparing a test vehicle, adjusting the mass of the test vehicle to a preset test mass, cutting off the braking energy recovery function, installing a motor vehicle road tester on the test vehicle, and driving the test vehicle on a horizontal asphalt pavement for sliding test;

secondly, performing sliding test and data acquisition, wherein a test vehicle starts sliding from 100km/h, in the process, acquiring delta V (vehicle speed variation) and sliding time corresponding to every 5km/h until the vehicle sliding speed is 0km/h, performing bidirectional 6 sliding tests and recording data;

thirdly, after the data effectiveness is analyzed, fitting is carried out according to the sliding resistance

[ M ] sliding mass; m' is the equivalent mass of the rotating part, and is generally 0.05M; Δ V: calculating a resistance point every 10km/h according to the vehicle speed variation; Δ T: fitting the time interval corresponding to the speed variation to obtain a test vehicle driving resistance model, and calculating the driving range according to the constant speed method

[ W: total battery energy (J); eta 1: the utilization rate of the battery energy is 0.95; eta 2: efficiency of conversion of electrical energy to mechanical energy (taken to be 0.95); s: a range (m) which can be continued at a predetermined constant speed; f: and according to the running resistance (N) under the specified constant speed, combining the two models to obtain the theoretical driving range data of the test vehicle.

The following describes the electric vehicle driving range simulation calculation method according to an embodiment of the present invention.

After a certain light bus is taken as a test vehicle, the example test operation is carried out according to the method disclosed by the invention, and the theoretical driving range data of the light bus is effectively obtained.

The specific application is as follows: (1) the main parameter information of a light bus is selected and shown in table 1

TABLE 1 vehicle Main parameters

Sample car number	1# vehicle
		Type of vehicle	M2
Vehicle length (mm)	5960
		Vehicle width (mm)	2020
Vehicle height (mm)	2650
		Servicing quality (kg)	3100
Maximum design gross mass (kg)	4490
		Additional mass (kg) of test	695
Test quality (kg)	3795
		Total electricity storage capacity of energy storage device (kWh)	76.5

(2) The sliding data of the light bus test is shown in the table 2

TABLE 2 taxi data

(3) The theoretical driving range is calculated according to the data simulation of the light bus in the following table 3

TABLE 3 theoretical driving range

Sample car number	1# vehicle
		Running speed (km/h)	40
Running resistance F (N)	618
		Driving range (km)	402

The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.

Claims (1)

1. A method for simulating and calculating the driving range of an electric automobile is characterized by comprising the following steps: the method comprises the following steps:

firstly, preparing a test vehicle, adjusting the mass of the test vehicle to a preset test mass, cutting off the braking energy recovery function, installing a motor vehicle road tester on the test vehicle, and driving the test vehicle on a horizontal asphalt pavement for sliding test;

secondly, performing sliding test and data acquisition, wherein a test vehicle starts sliding from 100km/h, the sliding time corresponding to the vehicle speed variation delta V every 5km/h is taken in the process until the vehicle sliding speed is 0km/h, and the two-way sliding test is performed for 6 times and data is recorded;

thirdly, after the data effectiveness is analyzed, fitting is carried out according to the sliding resistance

Wherein M is sliding mass; m' is the equivalent mass of the rotating part; Δ V: calculating a resistance point every 10km/h according to the vehicle speed variation; Δ T: fitting to obtain a test vehicle driving resistance model corresponding to the time interval of the vehicle speed variation, and calculating the model according to the driving range of the constant speed method

Wherein: w: total battery energy (J); eta 1: the utilization rate of the battery energy; eta 2: efficiency of conversion of electrical energy to mechanical energy; s: a driving range which can be continued at a prescribed constant driving speed; f: and according to the running resistance under the specified constant speed, combining the two models to obtain the theoretical driving range data of the test vehicle.