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Method for starting an internal combustion engine

A technology for starting internal combustion engines and engines, which is applied in the direction of machines/engines, mechanical equipment, engine control, etc., and can solve problems such as engine failure to start

Inactive Publication Date: 2015-06-17
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the hydrocarbon fuel present in the container after filling is very close to the BPVR hydrocarbon fuel, and there is a risk that the engine will not start, especially when the weather is very cold by recent estimates

Method used

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  • Method for starting an internal combustion engine
  • Method for starting an internal combustion engine

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Embodiment Construction

[0027] exist figure 1 In the block diagram of , two benchmark gradients are defined. These gradients represent the evolution of the engine speed during a cold start. Gradient 10 is given for hydrocarbon fuels with low vaporization capacity or BPVR hydrocarbon fuels, and gradient 11 is given for hydrocarbon fuels with high vaporization capacity or HPVR hydrocarbon fuels. Each gradient 10 and 11 is represented in the form of a table where the inputs are the engine temperature and the number of revolutions of the engine since the first combustion, e.g. in terms of the number of times the engine cylinders pass top dead center, labeled "Nb PMH". For example, the engine temperature is the temperature of the engine coolant, and the inputs for gradients 10 and 11 are labeled "Teau".

[0028] The data produced by each gradient, the data 12 for the gradient 10 and the data 13 for the gradient 11 form the two inputs of a function 14 allowing to define the gradient 15 of the hydrocarbo...

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Abstract

Method for starting an internal combustion engine using fuel stored in a tank, comprising estimating the amount of fuel present in the tank, estimating the ability of the fuel to vaporize (PVR), and adapting the amount of fuel to be injected into a cylinder of the engine, as the engine is started, as a function of the estimated ability of the fuel (16) to vaporize, characterized in that the estimated value of the ability of the fuel to vaporize (15) is replaced by a given value (20) upon an engine start that follows a topping-up of fuel in the tank.

Description

[0001] This application claims priority from French patent application 0856550 filed September 30, 2008, the contents of which (text, drawings and claims) are incorporated by reference. technical field [0002] The present invention relates to a method for starting an internal combustion engine for a passenger car. Generally speaking, the invention aims at reducing at source the emission of pollutants from gasoline engines, especially during cold starts. Background technique [0003] The quality of hydrocarbon fuels used in automobiles varies greatly, especially by geographic region or area in which the vehicle is driven. One physical characteristic of hydrocarbon fuels that varies particularly widely is their ability to vaporize. As is well known, this capability is represented in English literature by the acronym PVR for Raid Vapor Pressure. This acronym is used in the following description of the invention. For hydrocarbon fuels that are easy to vaporize, they are call...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02D41/06F02D41/24
CPCF02D41/0025F02D41/062F02D41/2493F02D2200/0612
Inventor F·古尔夫
Owner PEZHO SITROEN AUTOMOBILS SA
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