The typical working condition and potentiality of energy recovery in construction machinery are discussed. Existing energy recovery techniques in the three types of technology platform are summarized with their features analyzed.The latest engineering results of energy recovery system are introduced. A preview of possible developments and challenge is presented finally. These work will provide useful information for energy recovery in construction machinery and contribute to the development of this field.
To research the actual resistance for excavator in digging process, the relationship between manipulator motion, cylinder pressure and digging resistance was analyzed. On this basis, the equation for calculating digging resistance of excavator was proposed. By using tension sensor, a digging resistance test was done under the actual digging movement environment. And the obtained inclination angle and hydraulic cylinder signal data were imported into digging resistance calculation equation to get a calculation resistance. After comparing the calculation resistance with the tension sensor readings, the following conclusions can be derived: this calculation equation can reflect effectively the size and dynamic process of actual resistance during digging operation, and it can describe the instantaneous changes and impact status of real resistance much better can the empirical equation in which the resistance is directly proportional to the digging depth.
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