A Study On Hardware-In-The-Loop Simulation Of Electronically Controlled Suspension

The ECU is the core part of Electronically controlled suspension, the Electronic Control Unit. In the past for the development of ECU serial development model, with a longer development cycle. The speed of modern electronic product updates more quickly, the serial model can not meet the development requirements, and then V model development process came into being. Hardware in Loop Simulation (HIL) is a hardware-line real-time technology, It is the kind of computer I/O interfaces and software integration, and require the system software and hardware running in real time, to simulate the real operating conditions in the actual physical. Both a computer simulation of the efficiency, but also has real experimental accuracy, V model is the key technology development process. Therefore, the hardware in the loop simulation study has important practical significance.This car will be a certain type of semi-active electronically controlled air suspension system as the research object, In the automotive and suspension system performance analysis, based on the MATLAB/Simulink in the establishment of a quarter car suspension model. Test method to get through the shock absorber damping and stiffness of air springs and electronically controlled suspension of the bench test conducted after the test data processing and analysis, test results show that the damping obtained by experiment Control damping and air spring stiffness is correct.V model development based on the concept:Firstly, electronically controlled suspension by the functional design and offline simulation. For a particular car's electronic control semi-active air suspension system, designed for electronically controlled suspension of the fuzzy logic controller. Random displacement of each signal, the displacement step signal and sine signal as an incentive to carry out the off-line simulation, the passive suspension and electronically controlled semi-active suspension, body acceleration contrast curve. The results show that semi-active suspension system, electronically controlled suspension is better than passive damping performance, but also to illustrate that the fuzzy control strategy is feasible, can significantly improve the ride comfort. Secondly, in order to further verify the effect of the controller, the use of Southwest Jiaotong University Automotive Engineering Research Institute and Chengdu, anyest technic CO.Ltd.co-developed semi-active suspension electronic control test platform, based on the platform, a host computer using MATLAB/Simulink software to build a vehicle electronic control suspension hardware in the loop simulation model, and then embedded into the closed-loop system in the physical. Two-machine simulation model by using real-time tool MATLAB xPC Target, will host the hardware in the loop simulation model established by the compiled downloaded to the target machine to target machine instead of the actual electronic control unit (ECU) controlled electronically controlled semi-Active suspension, electronically controlled suspension to achieve hardware in the loop simulation, results show that the fuzzy controller has a certain effect.