Research on Constant Torque Control System Design for Hydraulic Retarder of Heavy Vehicle

The analysis of inner circulation circle flow characteristic of the partly filled hydraulic retarder during its braking course is carried out. a relation between the liquid filled ratio of the circulation circle in hydraulic retarder， the inner flow field pressure characteristic and the output torque characteristic of it is established, The control parameter token for the hydraulic retarder torque characteristic is acquired, then the Constant Torque Control System for Heavy Vehicle Hydraulic Retarder is formed. Through a test bed experiment of Constant Torque Control System for Heavy Vehicle Hydraulic Retarder, the validation of the Constant Torque Control System for Heavy Vehicle Hydraulic Retarder is verified，the whole system perfectly meet the design request.