Apparatus for detecting malfunction in evaporated fuel purge system
First Claim
1. An evaporated fuel purge system for use in an internal combustion engine, comprising:
- a fuel tank in which fuel is evaporated into a fuel vapor;
a canister including an adsorbent for adsorbing the fuel vapor from the fuel tank;
a vapor passage connecting said fuel tank to said canister for feeding the fuel vapor from said fuel tank into said canister;
a purge passage connecting said canister to an intake passage of the internal combustion engine for feeding the adsorbed fuel vapor in said adsorbent in said canister into said intake passage;
purge control valve means provided at an intermediate portion in said purge passage for controlling a flow of the adsorbed fuel vapor being fed by a vacuum pressure in said intake passage from said canister to said intake passage;
a pressure sensor provided at an intermediate portion in said vapor passage for outputting a signal indicative of pressure in said vapor passage; and
malfunction detection means responsive to said signal outputted by said pressure sensor for detecting a malfunction in said evaporated fuel purge system.
1 Assignment
0 Petitions
Accused Products
Abstract
A malfunction detection apparatus for detecting a malfunction in an evaporated fuel purge system for use in an internal combustion engine. The apparatus includes a vapor passage connecting a fuel tank to a canister for feeding fuel vapor from the fuel tank into the canister, a purge passage connecting the canister to an intake passage of the engine for feeding the fuel vapor adsorbed in an adsorbent in the canister into the intake passage, a purge control valve provided for controlling a flow of the adsorbed fuel vapor in the canister being fed into the intake passage, a pressure sensor provided for outputting a signal indicative of pressure in the vapor passage, and a malfunction detection part responsive to the signal outputted by the pressure sensor for detecting a malfunction in the evaporated fuel purge system.
90 Citations
8 Claims
-
1. An evaporated fuel purge system for use in an internal combustion engine, comprising:
-
a fuel tank in which fuel is evaporated into a fuel vapor; a canister including an adsorbent for adsorbing the fuel vapor from the fuel tank; a vapor passage connecting said fuel tank to said canister for feeding the fuel vapor from said fuel tank into said canister; a purge passage connecting said canister to an intake passage of the internal combustion engine for feeding the adsorbed fuel vapor in said adsorbent in said canister into said intake passage; purge control valve means provided at an intermediate portion in said purge passage for controlling a flow of the adsorbed fuel vapor being fed by a vacuum pressure in said intake passage from said canister to said intake passage; a pressure sensor provided at an intermediate portion in said vapor passage for outputting a signal indicative of pressure in said vapor passage; and malfunction detection means responsive to said signal outputted by said pressure sensor for detecting a malfunction in said evaporated fuel purge system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification