CN113267351A - Automobile multi-dimensional working condition testing system and method - Google Patents
Automobile multi-dimensional working condition testing system and method Download PDFInfo
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Abstract
A test system and test method of multidimensional working condition of the car, the test system includes the test machine rack, assembly of the dynamic system, working condition load module and working condition test evaluation module; the working condition loading module generates and sends an accelerator pedal signal and a brake pedal signal to the power system assembly; a power system control module of the power system assembly generates a power system control signal to control an automobile power system; the dynamometer rack comprises a dynamometer and a dynamometer control module, the dynamometer control module is used for calculating real-time vehicle speed and feeding the real-time vehicle speed back to the working condition loading module, and the dynamometer is mechanically connected with an automobile power system so as to simulate the speed change of an automobile running on a road according to an instruction of the dynamometer control module; the working condition test evaluation module is used for evaluating the accuracy of a working condition test result; the test method comprises working condition test and evaluation of the working condition test. The invention can realize the multi-dimensional working condition test including the gradient and improve the accuracy of the evaluation method.
Description
Technical Field
The invention belongs to the technical field of automobile testing, and particularly relates to an automobile multi-dimensional working condition testing system and method.
Background
The automobile power system is an important component of an automobile, and influences the dynamic property, the economy, the emission performance and the like of the automobile, so that the automobile power system test is an important part in the automobile development process. The automobile power system generally comprises an engine or an electric machine, a transmission and the like, wherein the engine or the electric machine is used for providing power for the automobile and is the heart of the automobile; the transmission is suitable for driving states such as starting, accelerating, backing and the like by changing the transmission ratio, and overcomes various road obstacles and the like. In order to ensure the performance of the automobile, the whole automobile needs to be tested, but the test period of the whole automobile is long, the cost is high, the influence of the outside is large, a large amount of manpower and material resources need to be consumed, and the dynamic bench test of the automobile can not be influenced by the outside test conditions and the environmental conditions; the test period is short; the labor is saved; the efficiency is high. In an automobile dynamic bench test, the selection of a driving condition has important influence on a test result of an automobile, the existing driving condition only comprises two variables of speed and time, but the speed and the time cannot accurately reflect the real driving condition of the automobile, and the driving condition of the automobile is also influenced by the gradient of a road. In addition, the speed following error also influences the test result, when the automobile is in two running conditions of high speed and low speed, the same speed following error occurs, different influences can be generated on the test result, and therefore, the working condition test experiment cannot be well evaluated by taking a certain determined speed following error as an evaluation index.
Disclosure of Invention
The invention aims to provide a multi-dimensional working condition testing system and a multi-dimensional working condition testing method for an automobile, which aim to solve the problem that in the existing working condition testing experiment, the target working condition does not contain road gradient information, so that the ramp resistance cannot be considered in the working condition testing experiment to influence the testing result, and simultaneously solve the problem that the accuracy of working condition testing is not perfect when the certain speed following error is used for evaluating the working condition testing.
In order to achieve the purpose, the invention adopts the technical scheme that: a multi-dimensional working condition testing system for an automobile comprises a dynamometer rack, a power system assembly, a working condition loading module and a working condition testing and evaluating module; the working condition loading module is used for generating an accelerator pedal signal and a brake pedal signal and sending the accelerator pedal signal and the brake pedal signal to the power system assembly; the power system assembly comprises a power system control module and an automobile power system, wherein the power system control module is used for receiving an accelerator pedal signal and a brake pedal signal, generating a power system control signal and performing power control on the automobile power system; the dynamometer bench comprises a dynamometer and a dynamometer control module, the dynamometer control module calculates the actual speed according to the rotating speed of a transmission shaft in the power system assembly acquired by a sensor and feeds the actual speed back to a working condition loading module to adjust the speed, the dynamometer is mechanically connected with an executing mechanism of an automobile power system, and the dynamometer simulates the speed change of an automobile running on a road according to the instruction of the dynamometer control module; and the working condition test evaluation module evaluates the accuracy of the working condition test result according to the actual vehicle speed fed back by the dynamometer control module and the target vehicle speed under the target working condition.
The sensor is a rotation speed sensor.
The working condition loading module is a driver simulator.
The control module of the power system is a vehicle control unit, a transmission controller and a motor controller, the vehicle power system comprises a transmission, a driving motor and a transmission shaft, and an output shaft of the transmission is mechanically connected with the transmission shaft.
And a torque sensor is also arranged on an output shaft of the transmission and used for acquiring a torque signal and sending the torque signal to the dynamometer control module.
The test system also comprises a target working condition module used for storing the test working condition information.
The method for testing the multidimensional working condition of the automobile by using the test system comprises the working condition test and the evaluation of the working condition test;
and (3) testing the working condition: (1) the vehicle control system comprises a driver module, a vehicle speed sensor and a vehicle speed sensor, wherein the driver module acquires a target vehicle speed from a target working condition module, generates an accelerator pedal signal or a brake pedal signal of a vehicle, and controls the vehicle power system control signal of the vehicle by the vehicle controller to control the vehicle;
(2) a rotating speed sensor arranged on the transmission shaft transmits a rotating speed signal of the transmission shaft to a dynamometer controller, the dynamometer controller calculates the current actual vehicle speed according to the rotating speed of the transmission shaft and simulation parameters, and feeds the actual vehicle speed back to a driver module, and the driver module adjusts the actual vehicle speed by combining with a target vehicle speed;
(3) a torque sensor arranged on an output shaft of the transmission transmits the torque output by the transmission to a dynamometer controller, the dynamometer controller calculates the vehicle speed at the next moment according to the actual vehicle speed calculated in the step (2) and the simulation parameters to obtain the target rotating speed of the dynamometer, and the dynamometer controller controls the dynamometer to accelerate or decelerate through an instruction to reach the target rotating speed so as to simulate the vehicle speed change of the automobile; after the vehicle speed changes, repeating the step (2) until the actual vehicle speed is consistent with the target vehicle speed under the target working condition;
evaluation of the working condition test: and evaluating the accuracy of the working condition test result at any moment in the test process according to the following formula by utilizing the calculation function of the working condition test evaluation module:
The simulation parameters comprise finished automobile parameters and running parameters, the finished automobile parameters comprise the total mass of the automobile, the radius of tires, the rolling resistance coefficient, the air resistance coefficient, the windward area of the automobile, the rotating mass conversion coefficient of the automobile and the main reduction ratio, and the running parameters comprise the braking force which is calculated by the finished automobile controller and sent to the dynamometer controller, the driving force which is calculated by the dynamometer controller according to the torque of the output shaft of the transmission and gradient information in a target working condition.
The dynamometer controller calculates the vehicle speed at the next moment under the current vehicle speed according to the following formula:
wherein m is the total mass of the automobile, FtAs a driving force of the vehicle, FfTo rolling resistance, FwAs air resistance, FiIs a ramp force, FjFor acceleration resistance, FbFor braking force, V0For initial speed, a is the acceleration of the vehicle, VtThe vehicle speed at the next time.
The invention has the beneficial effects that: according to the invention, a driver module automatically adjusts a brake pedal and an accelerator pedal according to a target vehicle speed signal and an actual vehicle speed signal; the target working condition provides target speed, time and road gradient information of the target working condition; the power system control module receives a pedal opening signal of the driver module to control the power system of the automobile; the dynamometer control module calculates a target rotating speed according to the torque, the whole vehicle parameters, the vehicle state, the running resistance and the like on the current transmission shaft, and then performs rotating speed regulation control; and the working condition test evaluation module evaluates the working condition test according to the difference value between the actual vehicle speed and the target vehicle speed of the target working condition. The invention calculates the resistance and the driving force of the automobile in the running process, and then combines the parameters of the whole automobile to calculate the current acceleration of the automobile, thereby controlling the dynamometer to reach the target rotating speed. The invention considers that the following errors of the same speed under different speeds can generate different influences on the working condition test effect, so the evaluation method provided by the invention has higher accuracy. The invention provides a new testing method for multidimensional working conditions comprising vehicle speed, time and gradient, and gradient signals are transmitted to a dynamometer control module in real time to calculate acceleration and finally control the target rotating speed, so that the multidimensional working condition testing is realized.
Drawings
Fig. 1 is a basic schematic diagram of the present invention.
Fig. 2 is a schematic diagram of the present invention in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.
Referring to the attached drawings 1 and 2, the automobile multi-dimensional working condition testing system comprises a dynamometer rack, a power system assembly, a working condition loading module, a working condition testing and evaluating module and a target working condition module; the working condition loading module is a driver module, adopts a driver simulator and is used for generating an accelerator pedal signal and a brake pedal signal and sending the accelerator pedal signal and the brake pedal signal to the power system assembly, and the power system assembly generates a power system control signal to control the power of the automobile power system; the power system assembly comprises a power system control module and an automobile power system, the power system control module is a vehicle control unit, the automobile power system comprises a transmission controller, a motor controller, a transmission and a driving motor, an output shaft of the transmission is connected with a transmission shaft of a vehicle, a rotating speed sensor is arranged on the transmission shaft, a torque sensor is arranged on the output shaft of the transmission, and the rotating speed sensor and the torque sensor are in signal connection with a dynamometer controller; the dynamometer bench comprises a dynamometer and a dynamometer control module, the dynamometer control module is a dynamometer controller, the dynamometer controller calculates the actual vehicle speed under a target working condition according to a rotating speed signal of a rotating speed sensor and feeds the actual vehicle speed back to a driver simulator to adjust the vehicle speed, the dynamometer is mechanically connected with a transmission output shaft in a power system assembly, and the dynamometer reaches the target rotating speed according to an instruction of the dynamometer controller to simulate the speed change of an automobile running on a road; the target working condition module stores working condition information such as vehicle speed, time, gradient and the like; and the working condition test evaluation module evaluates a working condition test effect according to the actual vehicle speed fed back by the dynamometer controller and the target vehicle speed under the target working condition.
The automobile multidimensional working condition testing method comprises working condition testing and evaluation of the working condition testing, and the method is explained in detail with reference to the attached figure 2.
And (3) carrying out working condition test under a target working condition: (1) the vehicle control system comprises a driver module, a vehicle speed sensor and a vehicle speed sensor, wherein the driver module acquires a target vehicle speed from a target working condition module, generates an accelerator pedal signal or a brake pedal signal of a vehicle, and controls the vehicle power system control signal of the vehicle by the vehicle controller to control the vehicle;
(2) a rotating speed sensor arranged on the transmission shaft transmits a rotating speed signal of the transmission shaft to a dynamometer controller, and the dynamometer controller calculates the current actual vehicle speed according to the rotating speed of the transmission shaft and the simulation parameters and feeds the actual vehicle speed back to a driver module to adjust the vehicle speed;
(3) a torque sensor arranged on an output shaft of the transmission transmits the torque of the transmission to a dynamometer controller, the dynamometer controller calculates the vehicle speed at the next moment according to the actual vehicle speed calculated in the step (2) and the simulation parameters to obtain the target rotating speed of the dynamometer, and the dynamometer controller controls the dynamometer to accelerate or decelerate through an instruction to reach the target rotating speed so as to simulate the vehicle speed change of the automobile; after the vehicle speed changes, repeating the step (2) until the actual vehicle speed is consistent with the target vehicle speed under the target working condition;
evaluation of the working condition test: and evaluating the accuracy of the working condition test result at any moment in the test process according to the following formula by utilizing the calculation function of the working condition test evaluation module:
The simulation parameters comprise finished automobile parameters and driving parameters, the finished automobile parameters comprise the total mass of the automobile, the radius of tires, the rolling resistance coefficient, the air resistance coefficient, the windward area of the automobile, the rotating mass conversion coefficient of the automobile and the main reduction ratio, and the finished automobile parameters need to be input into the dynamometer controller in advance. The driving parameters include braking force calculated by the vehicle controller and sent to the dynamometer controller, driving force calculated by the dynamometer controller based on the transmission output shaft torque, and grade information in the target operating condition.
The dynamometer controller calculates the vehicle speed at the next moment under the current vehicle speed according to the following formula:
wherein m is the total mass of the automobile, FtAs a driving force of the vehicle, FfTo rolling resistance, FwAs air resistance, FiAs ramp resistance, FjFor acceleration resistance, FbFor braking force, V0For initial speed, a is the acceleration of the vehicle, VtThe vehicle speed at the next time.
The above driving force, braking force, rolling resistance, air resistance, ramp resistance and acceleration resistance can be calculated according to the conventional calculation method in the field. For example: the rolling resistance is calculated according to the gravity of the automobile and the rolling resistance coefficient; calculating the air resistance according to the current speed, the air resistance coefficient and the windward area; the ramp resistance is calculated according to the gravity and the gradient of the automobile; calculating the acceleration resistance according to the rotating mass conversion coefficient of the automobile, the automobile mass and the acceleration; the braking force is determined by a control strategy of the whole vehicle controller; the driving force is calculated from the measured torque. Since this part is a conventional calculation method, it is not described herein in detail.
In the test system and the test method, the driver simulator can acquire the target speed from the target working condition module and can acquire the actual speed of the whole vehicle power system from the dynamometer controller. The driver simulator performs PID control on a difference value between a target vehicle speed and an actual vehicle speed to obtain an accelerator pedal opening value (namely an accelerator pedal signal) and a brake pedal opening value (namely a brake pedal signal), and transmits the accelerator pedal signal and the brake pedal signal to the vehicle control unit to simulate the operation of a real driver on the accelerator pedal and the brake pedal. When the difference value is greater than 0, the actual speed value is lower than the target speed value, and the whole vehicle power system needs to be accelerated; and when the difference is less than 0, the actual vehicle speed value is higher than the target vehicle speed value, and the whole vehicle power system needs to be braked and decelerated. In the invention, the driver simulator provides torque for the transmission shaft through the driving motor, and the dynamometer adjusts the rotating speed according to the calculation of the dynamometer controller to control the rotating speed of the transmission shaft.
The target working condition module is used for obtaining a target vehicle speed and a target gradient according to preset running working condition information, transmitting a target vehicle speed signal to the driver simulator and the working condition testing and evaluating module, and transmitting a gradient signal to the dynamometer controller. In the module, a user can select a known standard test working condition or input data such as time, vehicle speed and gradient to customize the test working condition, the module can convert the input discrete vehicle speed and time data into continuous data, and the data such as the target vehicle speed and the target gradient are sent to the driver simulator, the working condition following evaluation module and the dynamometer control module according to the system operation step length.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.
Claims (9)
1. The utility model provides a car multidimension operating mode test system which characterized in that: the system comprises a dynamometer rack, a power system assembly, a working condition loading module and a working condition testing and evaluating module; the working condition loading module is used for generating an accelerator pedal signal and a brake pedal signal and sending the accelerator pedal signal and the brake pedal signal to the power system assembly; the power system assembly comprises a power system control module and an automobile power system, wherein the power system control module is used for receiving an accelerator pedal signal and a brake pedal signal, generating a power system control signal and performing power control on the automobile power system; the dynamometer bench comprises a dynamometer and a dynamometer control module, the dynamometer control module calculates the actual speed according to the rotating speed of a transmission shaft in the power system assembly acquired by a sensor and feeds the actual speed back to a working condition loading module to adjust the speed, the dynamometer is mechanically connected with an executing mechanism of an automobile power system, and the dynamometer simulates the speed change of an automobile running on a road according to the instruction of the dynamometer control module; and the working condition test evaluation module evaluates the accuracy of the working condition test result according to the actual vehicle speed fed back by the dynamometer control module and the target vehicle speed under the target working condition.
2. The automobile multi-dimensional working condition testing system according to claim 1, characterized in that: the sensor is a rotation speed sensor.
3. The automobile multi-dimensional working condition testing system according to claim 1, characterized in that: the working condition loading module is a driver simulator.
4. The automobile multi-dimensional working condition testing system according to claim 1, characterized in that: the control module of the power system is a vehicle control unit, a transmission controller and a motor controller, the vehicle power system comprises a transmission, a driving motor and a transmission shaft, and an output shaft of the transmission is mechanically connected with the transmission shaft.
5. The automobile multi-dimensional working condition testing system according to claim 4, characterized in that: and a torque sensor is also arranged on an output shaft of the transmission and used for acquiring a torque signal and sending the torque signal to the dynamometer control module.
6. The automobile multi-dimensional working condition testing system according to claim 1, characterized in that: the target working condition module is used for storing the test working condition information.
7. The method for carrying out the multidimensional working condition test on the automobile by using the test system as claimed in any one of claims 1 to 6 comprises the working condition test and the evaluation of the working condition test;
and (3) testing the working condition: (1) the vehicle control system comprises a driver module, a vehicle speed sensor and a vehicle speed sensor, wherein the driver module acquires a target vehicle speed from a target working condition module, generates an accelerator pedal signal or a brake pedal signal of a vehicle, and controls the vehicle power system control signal of the vehicle by the vehicle controller to control the vehicle;
(2) a rotating speed sensor arranged on the transmission shaft transmits a rotating speed signal of the transmission shaft to a dynamometer controller, the dynamometer controller calculates the current actual vehicle speed according to the rotating speed of the transmission shaft and simulation parameters, and feeds the actual vehicle speed back to a driver module, and the driver module adjusts the actual vehicle speed by combining with a target vehicle speed;
(3) a torque sensor arranged on an output shaft of the transmission transmits the torque output by the transmission to a dynamometer controller, the dynamometer controller calculates the vehicle speed at the next moment according to the actual vehicle speed calculated in the step (2) and the simulation parameters to obtain the target rotating speed of the dynamometer, and the dynamometer controller controls the dynamometer to accelerate or decelerate through an instruction to reach the target rotating speed so as to simulate the vehicle speed change of the automobile; after the vehicle speed changes, repeating the step (2) until the actual vehicle speed is consistent with the target vehicle speed under the target working condition;
evaluation of the working condition test: and evaluating the accuracy of the working condition test result at any moment in the test process according to the following formula by utilizing the calculation function of the working condition test evaluation module:
8. The automobile multi-dimensional working condition testing method according to claim 7, characterized in that: the simulation parameters comprise finished automobile parameters and running parameters, the finished automobile parameters comprise the total mass of the automobile, the radius of tires, the rolling resistance coefficient, the air resistance coefficient, the windward area of the automobile, the rotating mass conversion coefficient of the automobile and the main reduction ratio, and the running parameters comprise the braking force which is calculated by the finished automobile controller and sent to the dynamometer controller, the driving force which is calculated by the dynamometer controller according to the torque of the output shaft of the transmission and gradient information in a target working condition.
9. The automobile multi-dimensional working condition testing method according to claim 7, characterized in that: the dynamometer controller calculates the vehicle speed at the next moment under the current vehicle speed according to the following formula:
wherein m is the total mass of the automobile, FtAs a driving force of the vehicle, FfTo rolling resistance, FwAs air resistance, FiIs a ramp force, FjFor acceleration resistance, FbFor braking force, V0For initial speed, a is the acceleration of the vehicle, VtThe vehicle speed at the next time.
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| CN115962962A (en) * | 2023-03-17 | 2023-04-14 | 中汽研新能源汽车检验中心(天津)有限公司 | Method for testing and evaluating working condition efficiency of electric drive assembly of equivalent whole vehicle |
| CN115962962B (en) * | 2023-03-17 | 2024-01-26 | 中汽研新能源汽车检验中心(天津)有限公司 | Method for testing and evaluating working condition efficiency of electric drive assembly of equivalent whole vehicle |
| CN116184097A (en) * | 2023-04-26 | 2023-05-30 | 深圳市好盈科技股份有限公司 | Test platform for simulating working conditions |
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