US 11,668,257 B2Granted

Method for synchronising a combustion engine

AssigneeVitesco Technologies GmbH

InventorsFabien Joseph, Stéphane Eloy

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Abstract

Disclosed is a method for synchronizing a combustion engine of a motor vehicle, including the steps of detection of the reference position of a first toothed wheel during a rotation of the crankshaft from the measurements sent by a first measuring sensor, detection of rising and falling edges of the teeth of a second toothed wheel during a concomitant rotation of the camshaft from the measurements sent by a second measuring sensor, identification of the detected edges with a first tolerance threshold on the angular position of the camshaft from recorded positions of the edges to synchronize the engine, the recorded positions being predetermined by learning from theoretical positions with a second tolerance threshold on the angular position of the camshaft, the first tolerance threshold being less than the second tolerance threshold, and synchronization of the engine from the identified edges of the teeth of the second toothed wheel.

Claims20

Dependent claims

A method for synchronizing a combustion engine (10) of a motor vehicle (1), said combustion engine (10) comprising a crankshaft (13), a first measuring sensor (16) configured to measure the angular position of said crankshaft (13) from a first toothed wheel (130) mounted on said crankshaft (13), at least one camshaft (15), and a second measuring sensor (17) configured to measure the angular position of said camshaft (15) from a second toothed wheel (150) mounted on said camshaft (15), each of said first toothed wheel (130) and second toothed wheel (150) comprising a plurality of teeth (131, 151, 152, 153), the first toothed wheel (130) comprising at least one free space (132) devoid of teeth (131) constituting a reference position, the position of each tooth (131) of the first toothed wheel (130) relative to the first measuring sensor (16) defining a different angular position of the crankshaft (13), the position of each tooth (151, 152, 153) of the second toothed wheel (150) relative to the second measuring sensor (17) defining a different angular position of the camshaft (15), the method comprising the steps of:

detecting (E1) the reference position (132) of the first toothed wheel (130) during a rotation of the crankshaft (13) from the measurements sent by the first measuring sensor (16),
detecting (E2) a plurality of rising and falling edges of the teeth (151, 152, 153) of the second toothed wheel (150) during a concomitant rotation of the camshaft (15) from the measurements sent by the second measuring sensor (17),
identifying (E3) the detected edges with a first tolerance threshold on the angular position of the camshaft (15) from recorded positions of said edges in order to synchronize the combustion engine (10), said recorded positions having been predetermined by learning (E0) from theoretical positions with a second tolerance threshold on the angular position of the camshaft (15), said first tolerance threshold being less than said second tolerance threshold,
synchronizing (E4) the combustion engine (10) from the identified edges of the teeth (151, 152, 153) of the second toothed wheel (150).

1 more element

A computer (20) for a vehicle (1), said vehicle (1) comprising a combustion engine (10) comprising a crankshaft (13), a first measuring sensor (16) configured to measure the angular position of said crankshaft (13) from a first toothed wheel (130) mounted on said crankshaft (13), at least one camshaft (15), and a second measuring sensor (17) configured to measure the angular position of said camshaft (15) from a second toothed wheel (150) mounted on said camshaft (15), each of said first toothed wheel (130) and second toothed wheel (150) comprising a plurality of teeth (131, 151, 152, 153), the first toothed wheel (130) comprising at least one free space (132) devoid of teeth (131) constituting a reference position, the position of each tooth (131) of the first toothed wheel (130) relative to the first measuring sensor (16) defining a different angular position of the crankshaft (13), the position of each tooth (151, 152, 153) of the second toothed wheel (150) relative to the second measuring sensor (17) defining a different angular position of the camshaft (15), the computer (20) being configured to:

detect the reference position (132) of the first toothed wheel (130) during a rotation of the crankshaft (13) from the measurements sent by the first measuring sensor (16),
detect a plurality of rising and falling edges of the teeth (151, 152, 153) of the second toothed wheel (150) during a concomitant rotation of the camshaft (15) from the measurements sent by the second measuring sensor (17),
identify the detected edges with a first tolerance threshold on the angular position of the camshaft (15) from recorded positions of said edges in order to synchronize the combustion engine (10), said recorded positions having been predetermined by learning from theoretical positions with a second tolerance threshold on the angular position of the camshaft (15), said first tolerance threshold being less than said second tolerance threshold,
synchronize the combustion engine (10) from the identified edges of the teeth (151, 152, 153) of the second toothed wheel (150).

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 17/288,492Filed 24 Oct 2019
Priority: FR 185982024 Oct 2018
Published: US 2021/0388783 A116 Dec 2021
Granted: 6 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F02D 41/00
Electrical control of supply of combustible mixture or its constituents
F02D 41/009
Electrical control of supply of combustible mixture or its constituents: using means for generating position or synchronisation signals
F02D 41/2438
Methods of calibrating or learning: active learning methods
F02D 2041/0092
Using means for generating position or synchronisation signals: synchronisation of the cylinders at engine start