Research on the Special Electrohydraulic Valve for Hydro-viscous Drive

Research on the Special Electrohydraulic Valve for Hydro-viscous Drive

Abstract
In this paper, the principle and structure of Hydro-viscous Drive (HVD) set — the newly developed soft start-up transmission equipment — is introduced. Through theoretical analysis of the HVD set start-up steadiness, the authors come to the conclusion that the non-linearity of the pressure performance curve and dynamic pressure instability of the pilot-operated electro-hydraulic pressure relief valve , which is used for the HVD speed regulating purpose and usually works within micro flow-rate and low oil pressure state, are the main causes of the poor start-up steadiness. So a special electrohydraulic speed regulating valve for HVD set is developed, with which the start-up steadiness of HVD set is much improved.

Keywords
HVD, oil film, special electrohydraulic valve, soft start-up , start-up steadiness