Abstract
This paper shall explore the dynamics of power transition in full power shift of hydromechanical transmission (HMT) and focus on the ideal target displacement ratio. An arithmetic two-range HMT is taken as the research object. A mathematical model of power transition in full power shift is established, including the hydraulic transmission unit model and the brake torque model during the double brakes overlapping. Aiming at the constant output power of HMT in the shift process, a prediction model of the displacement ratio target value is established, and the prediction method is proposed. By combining theoretical analysis and experimental research, it proves that the power transition model can describe the power transition process. And the prediction method of the displacement ratio target value proposed in this paper can complete the power transition when the double brakes overlap. In the power shift process, the output power can be transmitted normally in full power. The power transition model and the prediction method of the displacement ratio target value can provide theoretical and engineering references for the full power shift of HMT.
Highlights
hydromechanical transmission (HMT) is a dual power flow transmission consisting of hydraulic transmission unit and mechanical transmission unit [1, 2]
Sun et al [17,18,19] designed a power reflux hydromechanical transmission based on a torque converter instead of the traditional hydraulic transmission unit
K1 prediction method of the displacement ratio target value proposed in this paper can complete the power transition when the double brakes overlap
Summary
HMT is a dual power flow transmission consisting of hydraulic transmission unit and mechanical transmission unit [1, 2]. K1 prediction method of the displacement ratio target value proposed in this paper can complete the power transition when the double brakes overlap. E prediction method of the displacement ratio target value is deployed in the application layer algorithm of the transmission controller, which can actively the power transition process. When HMT shifts to the target range, the pressure building-up process just begins, which would cause a transitory output power interruption. Is paper shall build the power transition model in full power shift to explore the dynamics of power transition and propose the prediction method of the displacement ratio target value to actively control the pressure building-up process. Aiming at the constant output power of HMT in the shift process, a prediction model of the displacement ratio target value is established, and the prediction method is proposed.
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