Air supply concepts to improve efficiency of VCRC engines

摘要

The air supply to internal combustion engines using variable compression ratio and variable fuel supply VCRC, is improved. The improvements involve increasing thermal efficiency and/or reducing production of pollutants by this engine. The improvements can also be used with other engines that are regulated by fuel supply such as two-stroke diesel engines. These improvements are directed to engines in two basic categories; those with mechanical blowers only and those with turbo charging.

主权项

1. A two-stroke internal combustion engine in which output torque is controlled by fuel delivery and in which pollutants are minimized, while efficiency is enhanced, by starting sequential combustion of fuel and air in a cyclically varying expansion volume, including a device to initiate ignition, for a first phase of combustion with a substantially uniform mixture of the fuel and air, enough richer than stoichiometric to suppress the formation of oxides of nitrogen, with said cyclically varying expansion volume containing substantially all the fuel to be burned in one cycle together with only some of the air required in one cycle, and with the subsequent combining of the combustion products of said first phase of combustion with all the remaining air required in said one cycle to substantially complete the combustion of all the fuel in a second phase of combustion, the two-stroke internal combustion engine including:
a blower providing air flow to said engine; a controllable coupling driving said blower from said engine, said controllable coupling being usable to control a ratio of a rotational speed of said blower with respect to a rotational speed of said engine; a controllable throttle valve in a manifold defining an air flow passage out of said blower to an air intake of said engine; a vent passage beyond, in a direction of the air flow out of said controllable throttle valve, to the exterior air and after the air intake of the engine; a controllable vent valve located at an end of said vent passage remote from said controllable throttle valve, said controllable vent valve normally being closed; and a servo control system for controlling said controllable coupling in response to a device sensing when engine braking is needed, said servo control system also controlling said controllable throttle valve and said controllable vent valve at said end of said vent passage, said servo control system controlling said controllable throttle valve and said controllable vent valve to provide said braking of said engine.