Comfort Design Of Passenger Car Control Pedal Based On Multidisciplinary Method

With the rapid development of our country,the demand for automobiles is also growing in a straight line.When people buy automobiles,they will not only consider the cost performance of automobiles,but also directly enter the cab to feel the ride comfort,and step on the pedal and turn the steering wheel to ensure the handling comfort.In the process of operating automobiles,the pedal plays a very important role,so it is necessary to install the automobile pedal Optimize the design of mounting position and pedal feedback force.The work of this paper is as follows:(1)In this paper,the related knowledge of human skeletal muscle system is described,and the skeletal muscle of human lower limbs is briefly introduced.Combined with the GB/T 10000-1988 standard,a 95th percentile male skeletal muscle model and a driver's cab pedal dynamic model are built,which conform to the Chinese human body size.The coupling and restriction between the human body model and the driver's cab pedal model are established.(2)According to the built cab pedal model,determine the cab key points and pedal key points to be obtained,select appropriate test equipment,carry out static test on 30 test vehicles,carry out three-dimensional scanning on the cab and pedal,obtain the point cloud diagram of the cab and pedal,process it and obtain relevant parameters,among which,the maximum pedal travel range of the accelerator pedal38-96mm,37-72mm for the brake pedal,42-122mm for the accelerator pedal,111-142mm for the brake pedal,and 49-78mm for the two pedals.In the dynamic test,the urban route is designed to meet the requirements.By driving a test vehicle in this route,the maximum pedal force of the accelerator pedal is 67N and the common pedal stroke is 23.9m m;the maximum pedal force of the brake pedal is 327N and the common stroke is 24.4mm;the common speed is 0-60km/h and the common brake deceleration is 0-0.15g m~2/s.The data obtained from static test and dynamic test are analyzed as the main parameters and external driving data in virtual simulation.(3)Through the parameter data in the test,the design parameters that affect the pedal control are determined,and the control pedal in the cab is simulated and optimized to obtain the influence of different design parameters on the right lower limb muscle activation degree,which lays the foundation for optimizing the pedal comfort degree.(4)This paper expounds the concept of particle swarm optimization algorithm,determines the basic process,determines the objective function,design parameters and constraint range,and uses MATLAB software and Anybody software to jointly simulate to optimize the design variables of the control pedal under the 95 percentile male skeletal muscle model.After optimization,the height of the accelerator pedal to the ground is 101.6mm,the pedal preload is 8.9N,and the maximum pedal travel is50-55mm.The distance between the brake pedal and the accelerator pedal is 66.4mm,and the maximum pedal travel is 40-48mm.The optimized data was compared with the results of the maximum muscle activation under the parameters of the original test vehicle to ensure the reduction of muscle fatigue.