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This paper deals with the counterbalancing speed control issue of the closed hydrostatic drive hydraulic system of the heavy transportation vehicle under long down-slope. First, a novel method to realize the balancing to the down-slope weight force and the regulation to the motor speed is proposed. Next, a global fast terminal sliding mode control method is introduced to the speed control system....
Each axle of the heavy duty vehicle has the independently controlled hydraulic steering mechanism. It is of the stronger nonlinearity and load disturbance, therefore using the conventional control method is difficult to get good control effect. Based on the kinetic analysis of the steering system, this paper makes use of the model reference adaptive control to improve the dynamic response performance...
Multi-axle transportation vehicles usually adopt distributed electro-hydraulic proportional systems based on network to perform the complicated manipulation and control functions. Aiming to the adverse effects caused by network induced time delay, a networked sliding mode control strategy for leveling subsystem of multi-axle transportation vehicles is presented. The model of distributed leveling subsystem...
A head attitudes measurement system based on 3-axis micro-accelerometer and 3-axis micro-magnetoresistive sensor is designed and developed using for thermal imager setup of night-driving vehicle. The three attitude angles, i.e. pitch, roll and yaw, of driver's head are estimated relative to the driving vehicle in real time. In this system, the 3-axis micro-accelerometer detects the gravity field and...
This paper proposed a novel method providing high-update rate vehicle posture and velocity estimation using real-time kinematics global position system (RTK-GPS) and simple in-vehicle speed sensors. The RTK-GPS noise processing techniques are used to discard the noises that do not satisfy the Kalman filter model. Combining the RTK-GPS and speed sensors using extended Kalman filter (EKF) provided a...
High-speed railway rail-laying vehicles are large-scale special vehicles. Their automatic drive can improve precision and efficiency for laying rail. This paper presents rail-laying vehicle framework and automatic driving function, designs automatic drive control system based on CAN-bus. Especially, hydraulic steer model is set up by analyzing the steer system of rail-laying vehicles, resolving the...
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