US 8,527,189 B2Granted

Method for detecting electric power blips and managing the operation of a motor

AssigneeRENAULT s.a.s.

InventorChristophe Mounetou

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Abstract

The present invention relates particularly to a method for detecting electric power blips during transmission of an electric signal representative of a magnitude detected by a sensor (1) to an electronic control unit associated with a motor, characterized in that it includes the steps of: a) measuring said electric signal known as “raw signal” (SBTE); b) proceeding with the filtering of said raw signal to obtain a “filtered signal” (STFE); c) calculating for a constant time pitch, |raw signal−filtered signal|, that is, the absolute value of the difference between the raw signal and the filtered signal; d) comparing said absolute value to a predetermined threshold of maximum variation (SVM); e) when said absolute value is greater than said predetermined threshold of maximum variation, declaring a state of power blip; f) otherwise, repeating the preceding steps.

Claims11

Dependent claims

A method for detecting electric dropouts during transmission of an electric signal representative of a magnitude detected by a sensor to an electronic control unit associated with an engine, comprising:

a) measuring the electric signal as a raw signal;
b) filtering the raw signal based on speed of change of the raw signal so as to obtain a filtered signal;
c) calculating, for a constant time pitch, |raw signal−filtered signal|, as an absolute value of the difference between the raw signal and the filtered signal;
d) comparing the absolute value with a predetermined threshold of maximum variation;
e) when the absolute value is higher than the predetermined threshold of maximum variation, declaring a dropout state;
and
f) otherwise, reiterating the preceding operations, wherein
in b) the filtering compares the speed of change of the signal with a predefined maximum speed, and assigns the filtered signal, if the speed of change of the signal is faster than the maximum speed, a predefined value which corresponds to the predefined maximum speed, and
when the speed of change of the raw signal increases, the speed of change of the raw signal is compared with the predefined maximum speed, and
when the speed of change of the raw signal decreases, the speed of change of the raw signal is compared with the predefined maximum speed.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/866,287Filed 23 Jan 2009
Priority: FR 08 507215 Feb 2008
Published: US 2011/0029223 A13 Feb 2011
Granted: 3 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02D 41/222
Safety or indicating devices for abnormal conditions: relating to the failure of sensors or parameter detection devices
F02D 41/28
Using computer, e.g. microprocessor: interface circuits
F02D 2041/1432
Controller structures or design: the system including a filter, e.g. a low pass or high pass filter
G01R 31/50
Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by…