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A mean value model is presented for the transient operation of a 1.6 liter turbocharged indirect injection diesel engine. The model consists of a series of sub-models for the compressor, turbine and engine which result in a number of coupled, non-linear algebraic and differential equations. The equations are solved using a standard numerical solution package on a personal computer. The initial model calibration was performed using manufacturer supplied data and experimental data from steady state operation. Additional refinements of the model and its associated parameters were obtained through comparison with dynamic measurements on the engine. A comparison between simulated and experimental performance parameters is presented for both steady state and dynamic operation.

The pump-pipe-injector-injection system is the most commonly used type of injection equipment for Diesel engines. In order to be compatible with digital engine control, this system needs to be modified. The resulting fuel injection system should have the following characteristics: mechanical simplicity, direct control capability and low cost. Based on these requirements, the direct digital control of the pump-pipe-injector injection system has been investigated. A new solenoid control valve has been designed to simultaneously control the injection timing, fuel quantity and hydraulic performance. The conventional jerk-pump is very much simplified. A research type control unit based on a PC has been developed. The system has the possible configuration of electronic pump-pipe-valve-injector and electronic pump-valve-pipe-injector. The system was designed and analyzed on the basis of a comprehensive mechanical - magnetic - electrical - hydraulic computer simulation of the system.