| 摘要 |
PROBLEM TO BE SOLVED: To provide a waste heat regeneration system capable of preventing a rise of a rotational frequency of a motor generator over an allowance when a key switch of an engine is turned off. SOLUTION: A Rankine cycle 110 of the waste heat regeneration system 100 is constituted of a gear pump 111, a cooling water boiler 112, an exhaust gas boiler 113, an expander 114, and a condenser 115. The cycle also includes the motor generator 116 converting motive power generated by the expander 114 into electric power, and a bypass passage 117 making an upstream side communicate with a downstream side of the condenser 115. In a control unit 150, the rotational frequency control of the motor generator 116 is carried out, and when the key switch of the engine 140 is turned off, after opening the bypass passage 117, the rotational frequency control of the motor generator 116 is stopped after waiting for a pressure differenceΔp between the upstream side and the downstream side of the expander 114 is lowered to a predetermined valueδp or lower. COPYRIGHT: (C)2011,JPO&INPIT
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