Abstract
Auto hold refers to vehicle’s function of automatic braking under shutdown condition and automatic relieving braking force when vehicle starts. This paper presents a concrete structure of the novel auto hold system of hydrostatic transmission wheeled vehicle, and deeply analyses the working mechanism and control method. To validate its feasibility, AMESim software is adopted to establish the simulation model of the auto hold system based on mathematical theories. By using the data of a certain comprehensive operation mode as input, the curve of braking force of the auto hold system is obtained through simulation. It can be known through analysis that the proposed auto hold system can realize rapid response and provides stable braking force under different road conditions. Finally, the feasibility of the proposed auto hold system is validated by comparing the simulation data with actual braking force required and the electronic vehicle parking technology. It turns out that the auto hold system can meet the requirements of all road conditions. Besides, it also can provide a fault tolerance range for real vehicle experiments, and it will not cause adverse impacts due to excessive parking brake force.
Highlights
With the development of car factory and increase of people’s living standard, the vehicle holdings are increasing, roads are becoming increasingly crowded, and the disadvantages of conventional mechanical hand braking system are more and more prominent
Considering the comprehensive status of vehicle when moving normally, in this study the brake pedal was pushed down at vehicle speed of 10, 30 and 60 km/h and released, and we investigated whether the braking force provided by auto hold system at this point met the parking requirement or not
When vehicle parking on a road with 15% gradient, the minimum parking brake force provided by the auto hold system is 3367.3 N and the one provided by the electrical park brake system (EPB) is 3034.2 N, which is 11% higher
Summary
With the development of car factory and increase of people’s living standard, the vehicle holdings are increasing, roads are becoming increasingly crowded, and the disadvantages of conventional mechanical hand braking system are more and more prominent. In the case of uphill or downhill start, vehicles with conventional hand braking system require operator to proficiently control the brake and clutch, otherwise the phenomenon of vehicle sliding may occur, leading to potential safety hazard. In the case of frequent starting and braking on a crowded road, the driver needs to control the brake pedal or hand brake all the time, which will cause driving fatigue if lasting too long, and affecting safe driving. The release of auto hold concept perfectly overcomes the disadvantages of conventional hand braking system, reduces the rate of vehicle sliding, and enhances the safety of vehicle. The auto hold system has been widely applied in car factory [3,4,5]
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