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Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation of a motor vehicle in 'stop and start' mode

A technology for motor vehicles and polluting gases, which is used in engine starting, engine starting with electric motors, engine components, etc.

Inactive Publication Date: 2009-04-01
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The risk associated with EOBD is the cumulative nature of car restart difficulties leading to exceeding OBD (On Board Diagnostics) emission thresholds

Method used

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  • Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation of a motor vehicle in 'stop and start' mode
  • Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation of a motor vehicle in 'stop and start' mode

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Embodiment Construction

[0021] To determine the mechanical failure phenomena that lead to exceeding the OBD emission threshold under the accumulation of harsh restarts in licensed vehicles, define a restart quality table as shown below. Under the effect of this restart quality table level, it is compared with the reference value to decide whether to run the engine in "stop and start" mode.

[0022] According to the principle introduced by the present invention, at each restart, the total amount of fuel expelled is calculated and compared with the normal required fuel total amount. The difference between the two totals is considered to be the fuel injected but not combusted, the gaseous fuel in the exhaust. This value in driving distance is then compared with the underburned fuel level specified in "Mass Pollution", as explained below.

[0023] Each loop, between each key start, records a sequence of starts and restarts with 1, 2, ..., i, ....

[0024] In the first position, the injected fuel T is f...

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PUM

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Abstract

Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation in ''stop and start'' mode by stopping an engine just before and while a motor vehicle is stationary, whereby, upon each re-start, the amount of fuel injected is calculated, and the difference between the amount of fuel injected and the normal amount of fuel needed is calculated, the said resulting quantity being considered to represent the amount of fuel that was injected but not burnt; the said amount of fuel injected but not burnt is then compared against a predetermined threshold value, according to the distance covered, and finally, ''stop and start'' operation is or is not inhibited according to whether the said amount of fuel injected but not burnt is above or below the predetermined threshold value.

Description

technical field [0001] The present invention relates to a method for determining a pollutant gas threshold for controlling operation in a "stop and start" mode in which the engine is switched off immediately before and while a motor vehicle is at rest, and then according to an initial operation by the driver Restart. Background technique [0002] The "Stop and Start" (ST) system is a system that switches off the engine of a motor vehicle just before and when it comes to a standstill (traffic lights, traffic jams, etc.). When the next thought is to restart, the system can automatically resume and respond instantaneously when the driver releases the brake pedal. [0003] For example, this emission threshold is defined by the EOBD. EOBD (European On-Board Diagnostics) is a European regulation accompanying the Euro 3 standard. EOBD is intended to indicate to the driver with the signal light level when engine diagnostics are not effective in eliminating pollution above a thres...

Claims

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Application Information

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IPC IPC(8): F02D11/08F02D41/04F02D41/06
CPCF02D2200/0614Y02T10/48F02D41/065F02D41/042F02N11/0818Y02T10/40
Inventor J-C·德尼
Owner PEZHO SITROEN AUTOMOBILS SA
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