DUAL-POWER DRIVE SYSTEM, ENGINEERING MACHINERY VEHICLE, AND CONTROL METHOD

摘要

A dual-power drive system, comprising a mechanical power drive subsystem and a hydraulic power drive subsystem which are respectively used for driving different axles, wherein when both power drive subsystems are enabled, the off-ground rotation speed of a wheel corresponding to the mechanical power drive subsystem is controlled not to be higher than the off-ground rotation speed of a wheel corresponding to the hydraulic power drive subsystem. The hydraulic power drive subsystem comprises: a hydraulic motor (6); a hydraulic pump mechanism; an on-off mechanism provided on a hydraulic circuit between the hydraulic pump mechanism and the hydraulic motor (6) for enabling or disabling the hydraulic oil supply to the hydraulic motor (6) by the hydraulic pump mechanism; and an overflow mechanism provided at an inlet of the hydraulic motor (6) for implementing an overflowing function of excess hydraulic oil at the inlet position of the hydraulic motor (6). Also provided are an engineering machinery vehicle comprising the dual-power drive system and a control method for the dual-power drive system. The dual-power drive system is capable of supplying drive power when non-rigid connection is utilized between axles driven by different power drive systems.