System and method of multi-fuel engine control

摘要

A system controlling a multi-fuel compression ignition engine includes a crankshaft position sensor, an electronic control module for receiving an original time signal from the crankshaft position sensor and signaling the fuel injectors when to inject fuel into the combustion chamber in relation to when each piston is at top-dead-center, an injection pulse duration, and quantity and pressure under which the fuel is injected, and an electronic phase adjustor module for intercepting the time signal before it reaches the electronic control module, and when the fuel supplied to the engine is other than 100% No. 2 diesel or petroleum diesel fuel. The electronic phase adjustor module generates a revised time signal relative to time signal in terms of degrees of rotation of the crankshaft, so that when the engine is running on other than 100% No. 2 diesel or petroleum diesel fuel, harmful exhaust emissions are minimized.

主权项

1. A system for controlling exhaust emissions from a compression ignition engine capable of using multiple fuels drawn from at least two separate fuel storage tanks, the system comprising:
a crankshaft position sensor (CPS) for detecting a predetermined position of a crankshaft of the engine and sending a time signal when the position is detected, an electronic control module (ECM) for receiving an original time signal (T0) from the crankshaft position sensor (CPS) and separately signaling fuel injectors when to inject fuel into a cylinder combustion chamber in relation to when each piston is at top-dead-center in the chamber, a duration of the fuel injection (pulse), a pressure under which the fuel is injected, and a quantity of fuel injected, an electronic phase adjustor module for intercepting the original time signal (T0)-coming from the crankshaft position sensor (CPS) when the fuel supply to engine is 100% alternative fuel, or 100% mixture of alternative fuel and No. 2 diesel or petroleum diesel fuel, wherein the electronic phase adjustor is adapted to generate a revised time signal (T1, T2, . . . Tn) that is either retarded or advanced from the original time signal (T0) in terms of degrees of rotation of the crankshaft, and to cause the electronic control module (ECM) to send predetermined settings corresponding to the revised timing signal (T1, T2, . . . Tn) to the fuel injectors to set the timing of fuel injection when the fuel supply to engine is 100% alternative fuel, or 100% mixture of alternative fuel and No. 2 diesel or petroleum diesel fuel, so that when the engine is running on 100% alternative fuel, or 100% mixture of alternative fuel and No. 2 diesel or petroleum diesel fuel, one or more harmful emissions are minimized and reduced to a level substantially equal to or lower than a level of the one or more harmful emissions when the engine is running on only 100% No. 2 diesel or 100% petroleum diesel fuel.