Control method for engine start including warm-up phase and torque generation phase

Abstract

A control method (10) for starting of a combustion engine, comprising at least one cylinder, a combustion cycle sensor and a counter, comprising: - a fuel pressure increasing step (105) by means of a first combustion mode, - a temperature increasing step (110), which means by means of a second combustion mode and which comprises at least one combustion cycle, - a combustion cycle detection step (115), which by means of a combustion cycle sensor detects a successful combustion cycle and registers it by means of a counter, repeating the step (110) and (115) until the number of combustion cycles recorded by the counter equals a predetermined value, and - a torque generating step (120) by means of a third combustion mode.

Description

technical field [0001] The invention is directed to a control method for starting a combustion engine. The invention is applicable to gasoline, ethanol engines or engines using gasoline and ethanol mixtures. [0002] For direct injection engines, the invention is particularly advantageously applicable in the combustion mode during the engine start-up phase. Background technique [0003] In order to start an engine including injection, it is known from the prior art to use a specific combustion mode for starting. This specific combustion mode governs a set of parameters that differ from the engine's operating parameters during normal operation. [0004] It is known from the prior art to initiate a switchover from a combustion mode specific for start-up to a combustion mode dedicated to normal engine operation when an engine speed threshold is reached or when a predetermined time interval has elapsed since the engine started running. [0005] A disadvantage of this system i...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this system is that the management of switching from a combustion mode specific for start-up to a combustion mode dedicated to the normal operation of the vehicle needs to be calibrated on the basis of what is considered the worst-case system

[0006] In fact, the combustion mode dedicated to the start of the vehicle does not vary from vehicle to vehicle and does not allow to compensate for variability between vehicles, for example due to system aging, production dispersion or even the characteristics of the fuel used

[0007] Therefore, the variability between vehicles can lead to prolonged cranking times of the engine and even to failed cranking

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