Energy-saving control system of rubber-tyred container gantry crane

An energy-saving control system of rubber-tyred container gantry crane, wherein the energy-saving control system controls the diesel engine-electric generator set to stop when the crane is idle, and supplies power on line to an auxiliary system of the crane by utilizing an energy storage device, said energy-saving control system comprising:

• a super capacitor, for applying the energy stored during the running period of the diesel engine-electric generator set to supply power to the auxiliary system of the crane when the diesel engine-electric generator set is stopped;
• an inverter, connecting to the super capacitor and the auxiliary system, for converting the direct current of said the super capacitor to an alternating current for supplying the auxiliary system;
• a capacitor monitor module for generating a charge start signal when a charge signal is received or the voltage of the super capacitor is detected to be lower than a first predetermined value;
• a charger, being supplied by the diesel engine-electric generator set, for receiving the charge start signal and charging the super capacitor;
• and
• a monitor unit, for deciding the crane being at an idle state and transmitting the charge signal to the capacitor monitor module, and for controlling the diesel engine-electric generator set to stop or to slow down when it detects the super capacitor has been fully charged;
• after stopping or slowing down the diesel engine-electric generator set, the monitor unit controls the diesel engine-electric generator set to start or to operate at full speed when it detects the voltage of the super capacitor is lower than the first predetermined value.