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US 2001/0032627 A1Published application
Fuel vapor treatment apparatus in internal combustion engine and meteod thereof
AssigneeUnisia Jecs Corporation
InventorShigeo Ohkuma
Life of this patent
Estimating the term…
Abstract
Based upon a purge air quantity supplied via a purge control valve to an intake system of an engine, an intake air amount into the engine, a fuel injection quantity into the engine, and an air-fuel ratio of the combustion mixture, a fuel vapor concentration is calculated as fuel vapor concentration=(intake air amount+purge air quantity−air-fuel ratio×fuel injection quantity)/(the air-fuel ratio+1).
Claims19
A fuel vapor treatment apparatus in an internal combustion engine comprising:
- a fuel tank;
- a canister for adsorbing and collecting fuel vapor generated in said tank;
- a purge pipe for supplying to an intake system of said engine the fuel vapor that has been purged from said canister by using an intake negative pressure of said engine;
- a purge control valve disposed in said purge pipe, for controlling a purge air quantity supplied to said intake system of said engine;
- a control signal output unit for outputting a control signal to said purge control valve;
- a purge air quantity estimation unit for estimating said purge air quantity;
- an intake air amount detection unit for detecting an intake air amount into said engine;
- a fuel injection quantity calculation unit for calculating a fuel injection quantity to said engine;
- an air-fuel ratio detection unit for detecting an air-fuel ratio of the combustion mixture of said engine;
- and
- a concentration estimation unit for estimating a fuel vapor concentration in said purge air based upon said purge air quantity, said intake air amount, said fuel injection quantity and said air-fuel ratio, to output a signal indicative of said estimated concentration.
8 more elements
A fuel vapor treatment apparatus in an internal combustion engine comprising;
- a fuel tank;
- a canister for adsorbing and collecting fuel vapor generated in said tank;
- a purge pipe for supplying to an intake system of said engine the fuel vapor that has been purged from said canister by using an intake negative pressure of said engine;
- a purge control valve disposed in said purge pipe, for controlling a purge air quantity supplied to said intake system of said engine;
- a control signal output means for outputting a control signal to said purge control valve;
- a purge air quantity estimation means for estimating said purge air quantity;
- an intake air amount detection means for detecting an intake air amount into said engine;
- a fuel injection quantity calculation means for calculating a fuel injection quantity to said engine;
- an air-fuel ratio detection means for detecting an air-fuel ratio of the combustion mixture of said engine;
- and
- a concentration estimation means for estimating a fuel vapor concentration in said purge air based upon said purge air quantity, said intake air amount, said fuel injection quantity and said air-fuel ratio, to output a signal indicative of said estimated concentration.
8 more elements
A fuel vapor treatment method in an internal combustion engine comprising the steps of:
- estimating a quantity of purge air purged from a canister for adsorbing and collecting fuel vapor to be supplied to an intake system of said engine via a purge pipe and a purge control valve;
- detecting an intake air amount into said engine;
- calculating a fuel injection quantity to said engine;
- detecting an air-fuel ratio of the combustion mixture of said engine;
- and
- estimating a fuel vapor concentration in said purge air based upon said purge air quantity, said intake air amount, said fuel injection quantity and said air-fuel ratio, to output a signal indicative of said estimated concentration.
3 more elements
Dependencies are inferred from the claim text.