Hydraulic loading safety protection device and vehicle loading test system and method

Abstract

The invention relates to a hydraulic loading safety protection device, a vehicle loading test system and a method, which include a filter, and one end of the filter is connected in series with the first hydraulic protection circuit, the second hydraulic protection circuit and the third hydraulic protection circuit connected in parallel The other end of the filter is the first connecting end of the hydraulic loading safety protection device; the safety protection controller is electrically connected with the controllable components in the first hydraulic protection circuit, the second hydraulic protection circuit and the third hydraulic protection circuit. The vehicle loading test system includes a hydraulic loading safety protection device, a dynamometer loading system, a hydraulic loading system, a vehicle motor system and a CAN bus. The loading safety protection controller, the hydraulic loading system controller, the vehicle motor system controller, and the dynamometer loading system controller communicate through the CAN bus. The invention can be applied to the test task at the bench level of the electric vehicle, and can avoid the risk of instability of the vehicle loading test system caused by faults such as overload or failure of the loading system.

Description

technical field [0001] The invention relates to the field of electric vehicle technology and bench testing technology, in particular to a hydraulic loading safety protection device and a vehicle loading testing system and method. Background technique [0002] Unlike traditional internal combustion engine vehicles that have a single hydraulic braking system, electric vehicles have both motor braking and hydraulic braking sources, which can realize the combined output of motor braking and hydraulic braking at the wheels. Therefore, when performing bench tests on electric vehicles, dynamometer loading at the end of the wheel and hydraulic friction loading at the wheel brake disc can be performed simultaneously. On the one hand, this electro-hydraulic composite loading method can simulate road loads at the bench test level, and study vehicle economy and power performance at the vehicle level; The performance test of the hydraulic braking system under certain conditions, such as...

AI Technical Summary

Problems solved by technology

[0003] Existing loading test systems for vehicle bench tests generally use a single dynamometer (loading motor) as the main loading method to test the performance of internal combustion engines or motors on centralized test benches and to test the economy, comfort, and safety of the entire vehicle. The distributed test bench is a representative, and the above-mentioned electro-hydraulic composite loading test system has not been seen in technology research and development and production.

[0004] Although electro-hydraulic composite loading is the future development trend of electric vehicle bench test technology, there are still difficult problems in the safety of bench testing, especially represented by the overload and failure of the hydraulic loading system. The occurrence of such failures can easily lead to lock-up or runaway of the transmission shaft, further causing dynamic instability of the dynamometer and vehicle-mounted power source (such as vehicle-mounted motor) in terms of mechanical dynamics, and then resulting in a sharp increase in torque or even broken shafts. Serious threat to personal and property safety

The existing electric vehicle bench test technology has unsolved problems in terms of test efficiency and test safety technology, so it is necessary to carry out innovative improvements to the hydraulic loading safety protection device and vehicle loading test system

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