A hydraulic retarder type simulation loading system

Abstract

The invention discloses a hydraulic retarder type analog loading system. The hydraulic retarder type analog loading system comprises a torque sensor used for measuring the torque and the rotating speed of an input shaft of a retarder, the hydraulic retarder used for applying a load to an engine, a transmission used for changing the transmission ratio, a transfer case used for transmitting motion and the torque, a cooling system used for cooling and heat dissipation of the hydraulic retarder and the engine, a hydraulic system used for changing the rotating speed of a fan and the water flow of the cooling system, a hydraulic retarder ECU used for controlling the hydraulic retarder, a cooling and hydraulic system ECU used for controlling the cooling system and the hydraulic system, an information collecting system used for collecting the vehicle operation states such as the three-axis acceleration and the slope inclination, and a vehicle controller used for controlling a vehicle electronic control system. According to the hydraulic retarder type analog loading system, through a closed-loop control algorithm for the hydraulic retarder and the cooling and hydraulic systems, the loadingprecision for the analog load and system stability under different test conditions are ensured, and stepless regulation and control of the analog load are realized.

Description

technical field [0001] The invention relates to automobile simulation experiment technology, in particular to a hydraulic retarder type simulation loading system. Background technique [0002] With the rapid development of vehicles and roads, the average speed of heavy vehicles is increasing year by year. The friction disc brake device in the service brake system is more and more unable to adapt to the long-term and high-intensity work needs. As a kind of auxiliary braking device for automobiles, hydraulic retarder has been gradually applied to trucks and large and medium-sized passenger cars in recent years. For the hydraulic retarder and its control system, foreign countries have been relatively mature in theoretical research and practical application, and some scientific research institutions in my country are also conducting research on related product development and key technologies. [0003] Based on the performance and reliability test requirements of modern vehicl...

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Problems solved by technology

[0004] Through the test method of load trailer, the cost is high, the maneuverability and operational stability are poor, and it is easy to cause wear to the braking system of the test vehicle; although the eddy current retarder has good torque characteristics at medium and low speeds, the effective torque Small, cannot meet the simulated load, and is greatly affected by temperature, cannot guarantee effective work for a long time

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