The Design Of Vehicle Protection Device Based On The Laser Ranging Technology And Retarder Braking

The frequent occurrence of car accidents were gradually attracted as the rapiddevelopment of automotive technology, especially for large-scale vehicles, the trafficaccidents occurred in high-speed case was extremely serious because of its quality, sopeople began to focus on the safety of large-scale car issues. The automobile safetyresearch objects were mostly small vehicles at home and abroad. For the large-scalevehicles, there was a single algorithm, detection distance not controllable and brakingcomfort poor on the safety technology. In this paper, the laser pulses ranging was beused to detect the car with the front obstacle distance, to study a retarder fuzzy controlto achieve the expected braking solutions, which, for the crash in the light of thelarge-scale vehicles brake indicators on the basis of system related to the laser pulseranging principle, the laser transmitting and receiving circuits, the time intervalmeasurement and retarder fuzzy controller and the establishment of the department oftechnology was be study an discussed in-depth.In this paper, we used fly-across the time interval of laser pulses ranging, themeasurement error caused by counting module computing the TDC-GP2laser time offlight, reducing the laser pulse rise and fall times measured in order to achieve the150m distance error of0.5m providing a reliable guarantee. To drive the laser pulse,there was high-speed MOS tube as a switch device, dedicated driver IC to drive MOStransistor action in the receiving circuit, two amplifier circuit to return to the weaksignal a voltage comparison circuit will convert it into the main the signal controlchip acceptable. PWM wave control, adjust the size of the duty cycle to control thesize of the power current RMS to control eddy current retarder, the establishment of asafety concept, the introduction of the fuzzy controller, the brake is stable andcomfortable. The simulation results proved that the adoption of safety as the input ofthe fuzzy controller to control the retarder torque size than the switching control ofbraking distance is short, less time, and gentle braking process, and reduce the wheelwith the ground locking phenomenon.The paper about the research results:(1) Laser ranging applications in a large car, the detection distance with the speedchange at any time adjustment, automatic car early warning, deceleration and braking.(2) The friction brake and the retarder brake combined control of large vehicles brake retarder deceleration, friction brake to stop, to avoid the frequent use of thesecurity risks caused by the friction brake.In this paper, we deduced the function of the torque of the retarder with the rotationalspeed and the current. The concept of safety, will detect the distance and speedthrough the fuzzy control to achieve the purpose of vehicle safety brake, builtautomotive brake simulation systems, simulation and compared with the switchcontrol, to prove the safety through fuzzy control adjustment slow the speed detectorto achieve the purpose of the safety brake is theoretically feasible.