US 5,093,792 AGranted

Combustion prediction and discrimination apparatus for an internal combustion engine and control apparatus therefor

AssigneeKabushiki Kaisha Toyota Chuo Kenkyusho

InventorsMasahiro Taki, Matsuei Ueda

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Abstract

An apparatus for predicting and discriminating whether or not misfire, knocking and the like will occur from the cylinder pressure before the occurrence of the misfire, the knocking and the like by the use of a three layered neural network. The cylinder pressure signal detected by a cylinder pressure sensor is sampled and input to each of the elements of the input layer. The signal then is modulated corresponding to the strength (weight) of the connection between each of the elements, and transmitted to the hidden and output layers. The magnitude of signal from the elements of the output layer represents the prediction and discrimination results. The weight is learned and determined by a back propagation method.

Claims19

Dependent claims

A combustion prediction and discrimination apparatus for an internal combustion engine comprising:

(a) means for detecting a crank angle to output a crank angle signal;
(b) means for detecting a cylinder pressure to output a cylinder pressure signal;
(c) means for selecting said cylinder pressure signal in correspondence with said crank angle signal detected in a part of the whole period of a burning condition to be predicted and discriminated;
and
(d) means for predicting and discriminating the burning condition having a network constituted by multi-connected operational elements, such that each of said multi-connected operational elements:
(i) multiply each of a plurality of inputs to each of said multi-connected operational elements by weight;
(ii) add the multiplied results;
and
(iii) output a non-linear transformation of the sum,
wherein said weight is determined to cause the final output of said network to correspond to the burning condition to be predicted and discriminated on the basis of the information of said selected cylinder pressure signal, whereby the burning condition is predicted and discriminated on the basis of the magnitude of the final output obtained by one part of said cylinder pressure signal in correspondence with said crank angle signal.

7 more elements

A control apparatus for an internal combustion engine comprising:

(a) means for detecting a crank angle to output a crank angle signal;
(b) means for detecting a cylinder pressure to output a cylinder pressure signal;
(c) means for selecting said cylinder pressure signal in correspondence with said crank angle signal detected in a part of the whole period of a burning condition to be predicted and discriminated;
and
(d) means for predicting and discriminating the burning condition having a network constituted by multi-connected operational elements, such that each of said multi-connected operational elements:
(i) multiply each of a plurality of inputs to each of said multi-connected operational elements by weight;
(ii) add the multiplied results;
and
(iii) output a non-linear transformation of the sum,
wherein said weight is determined to cause the final output of said network to correspond to the burning condition to be predicted and discriminated on the basis of the information of said selected cylinder pressure signal, whereby the burning condition is predicted and discriminated on the basis of the magnitude of the final output obtained by one part of said cylinder pressure signal in correspondence with said crank angle signal;
and
means for controlling an internal combustion engine based on the discriminated results of said prediction discrimination means.

9 more elements

Dependencies are inferred from the claim text.