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1、附 录AA. multi-purpose vehicle chassis dynamometer With the rapid development of the automotive industry, traffic accidents and environmental pollution on the growing threat to human life, thus increasing the importance of vehicle detection technology stand out a variety of testing equipment have emer
2、ged. As a large-scale laboratory equipment, automobile chassis dynamometer can simulate vehicle road test a variety of conditions, the completion of the cars economy test, power test, evaluation and analysis of emissions performance, reliability test and drive the car on the special test . It is in
3、the automotive testing research, product development and quality testing new cars and the car is essential. Use complete chassis dynamometer test and the type of vehicle quality inspection and road test compared with the usual test speed, high precision, low cost, data stability, comparability and g
4、ood. In view of chassis dynamometers these advantages, many domestic manufacturers have developed a series of dynamometer products, these products are mainly used to detect the following auto axle load 10 t chassis power output, the maximum absorption power of 150 kW. Test items mainly: chassis powe
5、r output, the driving force, speed, acceleration, glide performance and the accuracy of the speedometer and odometer, and so on. But domestic dynamometer products there are many imperfections, must be resolved. For example: car in different conditions, different load and other conditions, the dynami
6、c performance can not be achieved continuous measurement and control system, control method is relatively backward. This article is for these deficiencies, the control system, control method has been improved to achieve the different conditions and different load conditions, the cars dynamic perform
7、ance for accurate and reliable continuous measurement and continuous measurement of emissions to increase functionality. In addition, the light of foreign advanced technology and experience, the use of computer technology for vehicle-related transmission loss, rolling resistance, altitude, temperatu
8、re and other parameters of simulation and correction. Multi-purpose vehicle chassis dynamometer (hereinafter referred to as dynamometer) is a new chassis dynamometer. Aircraft measurement and control system is the key to achieve its power equipment. Dynamometer testing computer control system to con
9、trol the use of high performance industrial control computer, the entire control system including computer, monitor, keyboard, mouse, printers, input and output terminal blocks, multi-PC bus interface card, SCR and its control circuit, all components have been installed in the 1.8 m high of the stan
10、dard 19-inch industrial control cabinet. Dynamometer control system coupled with the mechanical part of the (bench) constitute the entire dynamometer. Bench control system by the pressure sensor, speed sensor, pneumatic lift, and eddy current machines and other equipment to complete the dynamometer
11、measurement and control. PC bus interface board is a multi-computer interfaces and measurement equipment, control channel, on-site analog signal amplification and analog-digital conversion, digital signal measurement done by it, the interface card can also control multiple actuator movements, other
12、The card also provides a counter for frequency measurement of the interface. Wheel drive car in the bench rotating drum, drum rotation by the optical pulse output of the decoder, access multi-function card counter, measuring speed and distance traveled. Car driving in the bench, the driving force ca
13、n drum machine by the eddy current coupling the pressure sensor, the input channel signal sent to the computer, combined with the speed signal measurable cars dynamic performance. In the actual measurement process, the measured speed signal and set the speed comparison, according to a certain algori
14、thm to adjust bias resistance (eddy current excitation current), so that speed can be stabilized at a given value, complete constant speed under the conditions of the various data measurements. Dynamometer applications from the measurement control program, the login program and database service prog
15、ram structure, program design using advanced C / S (Client / Server) design. Measurement control program and the login program is a client application, they exchange data with the database is a database service procedures are completed, the database structure is transparent to users, to facilitate t
16、he system and other motor vehicle testing equipment or manage network connections. User login process is complete the basic information on the vehicle, the initial set of test items; measurement control program is the core of the system program, its main function is to complete the measurement and control hardware signals, according to testing requirements set by the login program to complete the detection task, the program also provides ano
