NEW ENERGY VEHICLE AND HYBRID DRIVING ELECTRIC-HYDRAULIC POWER-ASSISTED STEERING SYSTEM THEREOF

摘要

A new energy vehicle and a hybrid driving electric-hydraulic power-assisted steering system thereof. In the system, a main hydraulic unit is arranged between an oil storage tank (3) and a power-assisted steering device (5), and comprises a main hydraulic pump (4) and a main non-return valve (7). The main hydraulic pump is driven by a main drive device (1); a tee joint (8) is arranged between the main non-return valve and the power-assisted steering device; an oil outlet of the tee joint is connected to an oil inlet of the power-assisted steering device. An auxiliary hydraulic unit is arranged between the oil storage tank and the power-assisted steering device, and comprises an auxiliary hydraulic pump (10) and an auxiliary non-return valve (9). The auxiliary hydraulic pump is driven by an auxiliary drive device (11), and the auxiliary non-return valve is correspondingly arranged at the oil inlet of the tee joint. The main hydraulic unit of the system functions as a first power assisting source, and the auxiliary hydraulic unit functions as a second power assisting source. Once the first power assisting source goes wrong or is in failure, the second power assisting source can still meet the power assisting requirement of the power-assisted steering device, so that the reliability and security of the steering system and of the new energy vehicle using the system are improved.