摘要:
A power unit includes two or more power modules (1, 2, 3), each comprising an engine (11), a transfer case (12) connected to the engine (11) and a hydraulic pump set (13) connected to the transfer case (12). A controlling method for the power unit is also disclosed. Compared to the prior art of using a single super high power engine, the hydraulic mobile crane using the power unit has advantages of low cost, high reliability, and not being subjected to the restrictions by road transportation conditions during transportation.
摘要:
A single-cylinder pin-type telescopic boom track optimized control method and control system thereof are applied to switch between any two working conditions of any sections of a telescopic boom. The method and system establish a constrained condition according to the stroke of a telescopic oil cylinder. When the telescopic boom is changed from the current state A to the target state B, the most rapid and convenient telescopic path can be obtained based on the current position of the pin mechanism and other conditions. The method and system greatly improve the telescopic reliability and work efficiency of the single-cylinder pin -type telescopic boom, and are applied to the telescopic boom of any engineering machine, in particular to the telescopic boom of a heavy duty crane.
摘要:
A method for measuring the resistance value of the conversion resistance of a current mode analog/digital converter, involves keeping a current signal inputted to the current mode analog/digital converter constant (S11); obtaining a first digital quantity AD 0 transformed by the current mode analog/digital converter (S12); connecting a resistance R j , of which precision is higher than that of the conversion resistance R z of the current mode analog/digital converter, with the conversion resistance R z in parallel (S13); obtaining again a second digital quantity AD 1 transformed by the current mode analog/digital converter (S14); acquiring the resistance value of the conversion resistance R z by the following formula(I):
wherein, R 1 is the acquired resistance value of the conversion resistance R z , and R 2 is the resistance value of the resistance R j , of which precision is higher than that of the conversion resistance R z . The method can improve the precision of measuring and controlling the measured physical objects.