US 4,389,994 A · Internal combustion engine control system for use with turbo-charged engine, and method

Abstract

To permit operation of engines, particularly turbo-charged engines, at the maximum power level just short of causing engine knocking, and preventing engine knocking, temperatures in the engine are sensed and, if an excessive temperature signal is detected, for example excessive engine temperature, exhaust gas temperature, turbo-charged air, or turbo charger temperature, a fuel supply system, for example a fuel injection system, is controlled to enrich the mixture, for example by multiplying the fuel injection time by a factor as commanded by an additional control stage (26, 27, 30) which stores in a memory, such as a ROM (27), engine operating characteristic curves. In addition, spark retardation by a retarding angle (.alpha.1) can be commanded, the spark retardation in combination with enriching of the fuel-air mixture being less than without such enrichment, thus permitting operation of the engine at appropriate power and efficiency level without noticeably increasing fuel consumption in the course of continued operation of the engine.

Claims15

Dependent claims

Internal combustion engine (IC) control system, for an IC engine having a turbocharger

to control the admission and combustion of a fuel-air mixture being supplied to the engine comprising
means for supplying a fuel-air mixture to the engine having a controlled fuel-air ratio;
means (T1) for providing an engine operating temperature signal representative of at least one of:
engine temperature (T1);
exhaust gas temperature (T2);
inlet or induction air temperature (T3);
turbo charging air temperatures (T4);
turbo charger temperature (T5) arising in the operation of the engine;
means to prevent knocking of the engine which comprises
control means (26, 27, 30) including memory means (27) storing engine operating characteristics as a function of engine operating temperature,
said control means having said engine operating temperature signal applied thereto and furnishing an output signal to said fuel-air mixture supply means upon change of the operating temperature signal, indicative of increased operating temperature, above a predetermined level,
to increase the proportion of fuel to air to thereby enrich the fuel-air mixture being supplied to the engine.

9 more elements

Dependencies are inferred from the claim text.

Internal combustion engine control system for use with turbo-charged engine, and method

Life of this patent

Internal combustion engine control system for use with turbo-charged engine, and method

Life of this patent

Abstract

Claims15