Automotive Systems

Automotive Systems A u to m o tive Sstem s Th e fuel pressure control system (FPCS) was developed to comply with increasingly strict fuel-effi ciency and emissions regulations by improving fuel economy and reducing emissions. It controls the discharge fl ow rate of the fuel pump and fuel injection pressure in accordance with engine operating conditions. Past fuel supply systems have operated the fuel pump at maximum fl ow rate and maintained a constant fuel injection pressure, regardless of engine operating conditions. In contrast, the new system improves fuel economy in situations such as idling (when the required amount of fuel injection is low) by lowering the discharge fl ow rate so that the fuel pump power consumption is reduced. It also boosts the fuel injection pressure when cold-starting the engine to atomize the injected fuel and reduce hydrocarbon (HC) emissions. Th e system components have the following features. (1) Fuel pump control module: designed for smaller size and lighter weight, it provides a continuously variable fuel pump output and supports large capacity fuel pumps. (2) Engine control module: high level of accuracy for control of fuel injection pressure. (3) Fuel pump: controls costs by minimizing changes from previous fuel pumps. (Hitachi Automotive Systems, Ltd.) (Date of initial production: September 2013) Fuel Pressure Control System 1