US 4,112,879 AGranted

Process for the regulation of the optimum operational behavior of an internal combustion engine

AssigneeRobert Bosch GmbH

InventorsJurgen Assenheimer, Valerio Bianchi, Johannes Brettschneider, Reinhard Latsch, Dieter Scherenberg

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Abstract

A process for controlling the operation of an internal combustion engine based on the volumetric efficiency of the engine to define a primary nominal fuel quantity. The process also includes measuring the fluctuations in the volumetric efficiency. In order to operate the engine in a preferred leaned-out condition, a nominal set-point value of the permitted range of fluctuations of the volumetric efficiency is established and the actual measured fluctuations are maintained in that range by changing the fuel metered out to the engine. Various methods for measuring the volumetric efficiency indirectly by pressure measurements in the induction tube are presented.

Claims26

Dependent claims

A process for controlling the operation of an internal combustion engine, said engine including a fuel metering system, and an air flow metering system, comprising the steps of:

measuring the volumetric efficiency of said engine, generating first signals related thereto and deriving therefrom a nominal fuel quantity;
differentiating said first signals to obtain second signals related to fluctuations of said volumetric efficiency;
comparing said second signals with set-point values related to permissible magnitudes of said fluctuations;
deriving from said comparison a correction variable;
and
altering the prevailing fuel-air ratio of the engine in dependence on said correction variable;
whereby said fluctuations of the volumetric efficiency constitute a controlled variable of the engine.

4 more elements

Dependencies are inferred from the claim text.