Fuel vapor control system with leak check
First Claim
1. A fuel vapor control system for a fuel supply system of an engine, comprising:
- means for detecting an internal pressure of a fuel vapor passage including a fuel tank;
means for closing the fuel vapor passage during a leak check period in which a leak check is carried out when the engine is not activated;
means, activated intermittently in the leak check period, for sampling the internal pressure intermittently in response to the activation so that the means for sampling consumes electrical power when activated to perform the sampling and does not consume electrical power when deactivated between sampling timings; and
means for determining a leak or not based on the sampled values of the internal pressure sampled by the sampling means.
0 Assignments
0 Petitions
Accused Products
Abstract
A fuel vapor control system has a controller that carries out a leak check processing after the engine is stopped. The controller includes a device that intermittently activates the controller itself or a part of the controller to sample an internal pressure of the fuel vapor passage. Then, after a predetermined time, the controller determines that whether the sampled values of the internal pressure indicate a leak or not by evaluating the sampled values. According to the arrangement, since at least a part of the controller is activated intermittently, the consumption of electricity can be reduced. The fuel vapor control system has a canister valve and a purge valve made of normally close type valves in order to reduce the consumption of electricity after the engine is stopped.
-
Citations
37 Claims
-
1. A fuel vapor control system for a fuel supply system of an engine, comprising:
-
means for detecting an internal pressure of a fuel vapor passage including a fuel tank;
means for closing the fuel vapor passage during a leak check period in which a leak check is carried out when the engine is not activated;
means, activated intermittently in the leak check period, for sampling the internal pressure intermittently in response to the activation so that the means for sampling consumes electrical power when activated to perform the sampling and does not consume electrical power when deactivated between sampling timings; and
means for determining a leak or not based on the sampled values of the internal pressure sampled by the sampling means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18)
-
-
15. A fuel vapor control system for a fuel supply system of an engine, comprising:
-
a valve that closes a passage to define a closed chamber including a part of the fuel vapor passage;
a pressure sensor disposed on the closed chamber to detect an internal pressure of the closed chamber;
a controller that inputs a signal from the pressure sensor and operates the valve in a closed condition when a leak check is carried out when an engine is not activated, wherein the controller includes;
a power control block that intermittently turns on power supply when the leak check is carried out;
a sampling block that is intermittently activated by being supplied power from the power control block and samples the internal pressure detected by the pressure sensor in response to an activation and that is deactivated by not being supplied power from the power control block between sampling timings; and
a leak check block that determines a leak or not based on values of the internal pressure sampled by the sampling block. - View Dependent Claims (16, 17)
-
-
19. A method of controlling fuel vapor in a fuel supply system of an engine, the method comprising:
-
detecting an internal pressure of a fuel vapor passage including a fuel tank;
closing the fuel vapor passage during a leak check period in which a leak check is carried out when the engine is not activated;
sampling, using a sampling device, the internal pressure intermittently in response to intermittent activation of the sampling device during the leak check period so that the sampling device consumes electrical power when activated to perform the sampling and does not consume electrical power when deactivated between sampling timings; and
determining a leak or not based on the sampled values of the internal pressure sampled by the sampling device. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A fuel vapor control system for a fuel supply system of an engine, comprising:
-
means for closing a fuel vapor passage during a leak check period in which a leak check is carried out when the engine is not activated;
means for activating a means for sampling, intermittently in the leak check period, that consumes electrical power when activated and does not consume electrical power when deactivated, and that is used for the leak check; and
means for determining whether a leak exists by monitoring the means for sampling. - View Dependent Claims (34, 35)
-
-
36. A method of controlling fuel vapor in a fuel supply system of an engine, the method comprising:
-
closing a fuel vapor passage during a leak check period in which a leak check is carried out when the engine is not activated;
activating a sampling device, intermittently in the leak check period, that consumes electrical power when activated and that is used for the leak check; and
determining whether a leak exists by monitoring the sampling device.
-
-
37. A method of controlling fuel vapor in a fuel supply system of an engine, the method comprising:
-
closing a fuel vapor passage during a leak check period in which a leak check is performed while the engine is off;
supplying power to a sampling device for the leak check intermittently in the leak check period so that the sampling device is activated intermittently;
monitoring the component; and
determining whether a leak exists based on the result of monitoring the sampling device.
-
Specification