Fuel vapor leak check module

• US 20050044938A1
• Filed: 08/23/2004
• Published: 03/03/2005
• Est. Priority Date: 08/25/2003
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Tsuruta, Masafumi, Kano, Masao
• Granted Patent: US 7,051,718 B2
• Time in Patent Office: Days
• US Class Current: 73/114.410
• CPC Class Codes: F02M 2025/0845 Electromagnetic valves
• CPC Class Codes: F02M 25/0818 having means for pressurising the evaporative emission space

Abstract

A housing of a fuel vapor leak check module is arranged close to a canister by inserting a canister port into the canister. A distance between the canister and the leak check module is reduced. A centerline of the canister port is approximately parallel to a centerline of an atmospheric vent port. A brushless motor of which axial length is relatively short drives a pump so that the housing is formed stepwise at the side opposite to the canister. A connector is disposed on the housing accommodating the pump to reduce a dead space.

Claims

1. A fuel vapor leak check module comprising;

an evaporated fuel purge system including a fuel tank, a canister which connects to the fuel tank through a tank passage, and a purge valve connected to an intake system of an engine through a purge passage;

a pump pressurizing or depressurizing the interior of the evaporated fuel purge system;

a motor driving the pump;

a canister port communicating with the fuel tank through the canister which adsorbs a fuel vapor generated in the fuel tank;

an atmospheric vent port being substantially parallel to the canister port and extending in an opposite direction relative to the canister port, the atmospheric vent port having an end opened to atmosphere;

a switching valve selectively switching between a position in which the canister port is communicated with the atmospheric port and another position in which the canister port are communicated with the pump; and

a housing having an accommodating space which accommodates the pump, an accommodating space which accommodates the switching valve, the canister port, and the atmospheric port, the canister port being inserted into the canister.

2. The fuel vapor leak check module for detecting a fuel vapor leakage from a fuel tank according to claim 1, wherein

the housing has a flat surface confronting the canister at opposite side of the fuel tank.

3. A fuel vapor leak check module comprising;

an evaporated fuel purge system including a fuel tank, a canister which connects to the fuel tank through a tank passage, and a purge valve connected to an intake system of an engine through a purge passage;

a pump pressurizing or depressurizing the interior of the evaporated fuel purge system;

a motor driving the pump;

a canister port communicating with the fuel tank through a canister which adsorbs a fuel vapor generated in the fuel tank;

an atmospheric vent port having an end opened to atmosphere;

a switching valve selectively switching between a position in which the canister port is communicated with the atmospheric port and another position in which the canister port are communicated with the pump; and

a housing having a pump accommodating space which accommodates the pump, a valve accommodating space which accommodates the switching valve, the canister port, and the atmospheric port, the canister port being inserted into the canister, wherein

the housing is provided with a connector on an outer surface of the pump accommodating space at the opposite side of the canister, the connecter having terminals electrically connected to the motor and the switching valve.

4. The fuel vapor leak check module for detecting a fuel vapor leakage from a fuel tank according to claim 3, wherein

the housing has a side surface opposite to the canister, the side surface being formed stepwise in such a manner that the valve accommodating space protrudes than the pump accommodating space, and the motor is a brushless motor.

5. The fuel vapor leak check module for detecting a fuel vapor leakage from a fuel tank according to claim 4, wherein

a distance between the outer surface of the housing opposite to the canister and an end of the connecter opposite to the canister is approximately equal to a distance between the outer surface of the housing forming the pump accommodating space at the side opposite to the canister and the outer surface of the housing forming the valve accommodating space at the side opposite to the canister.