Oliff & Berridge PLC
Control apparatus and method for high-pressure fuel pump for internal combustion engine
 In a high-pressure pump for an internal combustion engine, a spill valve is inhibited from being stopped frequently. If the fuel injection amount becomes smaller than a predetermined amount, a method of determination is changed so that a feedforward term for duty control increases. This makes it unlikely that the duty ratio will become equal to zero. Operation resulting from a closing motion of the spill valve occurs substantially regularly. As a result, the circumstance where operation noise is generated irregularly is avoided, and a sense of incongruity given to the driver is reduced. 
Toyota Jidosha Kabushiki Kaisha
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Yusuke Daichi Hiroyuki Noboru
Kamijo Yamazaki Mizuno Takagi