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| Number | Title | Issue Date |
| 8122758 | Purge valve leak diagnostic systems and methods A leak diagnostic system for a vehicle comprises a tank pressure module and a leak diagnostic module. The tank pressure module selectively outputs first and second fuel tank pressures when an engine is shut down and when engine vacuum is greater than a predetermined... | 02/28/2012 |
| 7937988 | Method and device for checking for leakage in a fuel injection valve of an internal combustion engine In a method and a device for testing for leakage in a fuel injection valve of an internal combustion engine, a temperature quantity is determined that characterizes the temperature of at least a part of the fuel injection valve. On the basis of this temperature quan... | 05/10/2011 |
| 7878046 | Evaporative emission system test apparatus and method of testing an evaporative emission system A test apparatus for an evaporative emission system includes a source of pressure (positive or negative), a sensor for sensing the pressure generated in the evaporative emission system, and an ECU which controls the operation of the source of pressure and receives s... | 02/01/2011 |
| 7841229 | Leak detecting apparatus Apparatus and method for use in testing the fluid tightness of closed vessels or fluid systems, such as found in the pressurized cooling system of an internal combustion engine and the fluid transmission of an automobile. The apparatus is configured to detect and/or... | 11/30/2010 |
| 7707872 | Method for testing a hydraulic manifold A manufacturing process, system, and method is described that facilitates the assembly and testing of a hydraulic manifold with integral closed loop pressure sensing and feedback. ... | 05/04/2010 |
| 7685867 | Leak diagnostic apparatus for a vaporized fuel processing system A leak diagnostic apparatus for a vaporized fuel processing system that purges vaporized fuel in a fuel tank of a vehicle is disclosed. The leak diagnostic apparatus comprises a leak diagnostic device, a fuel tank condition detection device and a determining device.... | 03/30/2010 |
| 7624624 | Pump assembly and method for leak detection of fluid system A method of detecting a leak in a fluid system, which includes a switch that changes state according to pressure in the fluid system. The method includes changing pressure in the fluid system with a pump assembly. The pump assembly includes a predetermined leak that... | 12/01/2009 |
| 7614283 | Cooling system testing apparatus and methods This invention describes apparatus for and methods of testing cooling systems. The apparatus and method can be used for, among other things, pressurizing the cooling system either to a positive pressure or to a negative pressure, and for conducting temperature tests... | 11/10/2009 |
| 7594427 | Rate-based monitoring for an engine system Rate based monitoring includes performing test cycles on a monitored system when predetermined conditions are met. Completion of a test cycle is determined by timing a period that is at least as long as the longer of a time required to detect a correct operation of ... | 09/29/2009 |
| 7584651 | Procedure to diagnose a leak in the fuel tank in a fuel tank ventilation system A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accum... | 09/08/2009 |
| 7581433 | Cylinder leak detector An apparatus and method for detecting cylinder leaks in an internal combustion engine includes a hose having an end configured for communication with a spark plug hole connecting to a cylinder to be tested and an end for attachment to a source of pressurized gas. Fl... | 09/01/2009 |
| 7562561 | Intake air leak determination system and method An intake manifold air leak determination system and method for an internal combustion engine including an intake manifold fluidly connected to a plurality of cylinders of the engine and a plurality of fuel injection valves for injecting fuel for the cylinders. Each... | 07/21/2009 |
| 7562559 | Fuel vapor detection system for vehicles An electric motor or generator is used to spin the vehicle's internal combustion engine while the engine is not running, in order to draw a vacuum within the vapor control system. Vacuum bleed off is then monitored to determine if an unacceptable condition in the co... | 07/21/2009 |
| 7562560 | Engine off vacuum decay method for increasing pass/fail threshold using NVLD A technique is provided for detecting leaks in a fuel system such as an automotive fuel system. The technique complements an on-board diagnostics evaporative leak monitor that uses natural vacuum leak detection (NVLD). The technique utilizes the same switch and valv... | 07/21/2009 |
| 7484406 | Abnormality determining apparatus of fuel vapor processing system An abnormality determining apparatus of a fuel vapor processing system is provided. The system includes a canister for temporarily reserves fuel vapor generated within a fuel tank and a fuel vapor path for discharging the fuel vapor to an engine intake passage. When... | 02/03/2009 |
| 7472583 | Evaporated fuel leakage detector for use in automotive vehicle A detector for detecting evaporated fuel leakage from a fuel tank is connected to the fuel tank through a canister for absorbing evaporated fuel. When an engine is not in operation, air in the fuel tank is sucked by a pump installed in the detector. If the pressure ... | 01/06/2009 |
| 7472582 | Leak diagnosis system and leak diagnosis method An ECU drives a pump in a first stage at a first pumping capacity. The ECU drives the pump in a second stage after the first stage at a second pumping capacity, which is lower than the first pumping capacity. The second pumping capacity is set such that when at leas... | 01/06/2009 |
| 7448257 | Leak check apparatus for fuel vapor processing apparatus A leak check apparatus performs a leak check of a fuel vapor processing apparatus based on a change in a negative pressure in a purge line during leak down. The pressure change during leak down is corrected by measuring an amount of vapor generated after the purge l... | 11/11/2008 |
| 7418856 | Method for checking the gastightness of a motor vehicle tank ventilation system The invention relates to a method for checking the gastightness of a motor vehicle tank ventilation system consisting essentially of a fuel tank, an adsorption filter, a ventilation line with a pressure sensor, a fresh air line with an adsorption filter check valve ... | 09/02/2008 |
| 7401494 | Valve test apparatus and methods for testing a solenoid valve or a venturi valve A valve test apparatus, a solenoid valve test method and a venturi valve test method are provided. The valve test apparatus may include a gas supply unit, a solenoid valve holding unit, a first measurement unit, a venturi valve holding unit, a second measurement uni... | 07/22/2008 |
| 7387014 | Vacuum generator for vacuum-decay leak testing the evaporative emissions system of a motor vehicle A compact (e.g., hand held) vacuum generator having particular application for creating a vacuum within the evaporative emissions system (e.g., a gas tank) of a motor vehicle so that a vacuum-decay test can be performed to test the system for leaks while mitigating ... | 06/17/2008 |
| 7383722 | Fuel vapor treatment system with leak diagnosing A fuel vapor purge system is configured to execute a highly accurate leak diagnosis with respect to a fuel vapor leak. After the engine is stopped, the temperature of the fuel vapor rises temporarily and then decreases until it reaches the outside ambient temperatur... | 06/10/2008 |
| 7370520 | Method of testing a fuel injection valve for a diesel engine Method of testing a fuel injection valve 1 for a diesel engine by supplying pressurized oil to the inlet side of the valve. According to the invention the oil pressure is gradually recorded, the pressure increase being interrupted at the moment when the openi... | 05/13/2008 |
| 7367220 | Engine oil leak test method with EGR valve leak offset A method for pressure testing an engine to detect possible oil seal leaks. The engine is charged with a predetermined pressure while air pressure is also applied to an exhaust gas recirculation (EGR) valve intake port to offset leakage inherent in the EGR valve. The... | 05/06/2008 |
| 7367219 | Automatic control of leak test unit during testing and analysis of an engine A method and apparatus for developing a test for determining if an engine has oil seal leaks. The engine is charged with a predetermined pressure of air and monitored by a leak tester. A digital valve is set to provide a certain leak rate based upon signals received... | 05/06/2008 |
| 7366604 | Fuel vapor treatment system with leak diagnosing A fuel vapor purge system is configured to execute a highly accurate leak diagnosis with respect to a fuel vapor leak. After the engine is stopped, the temperature of the fuel vapor rises temporarily and then decreases until it reaches the outside ambient temperatur... | 04/29/2008 |
| 7360408 | Method for determining a fuel pressure related fault and operating an internal combustion engine based on the fault The invention relates to a method for operating a combustion engine (1) comprising a fuel-driven heat engine (5), which permits a differentiation of faults during the supply of fuel. To this end, the fuel is supplied under pressure to the heat engine (... | 04/22/2008 |
| 7360401 | Leak detector for evaporated fuel An evaporated fuel leak detector detects leakage of an evaporated fuel generated in a fuel tank. The detector includes: a differential pressure valve, a pump for sucking a detection port side to reduce pressure on a fuel tank side, and pressure detection means for d... | 04/22/2008 |
| 7350512 | Method of validating a diagnostic purge valve leak detection test A system and method for evaluating the integrity of a leak detection test for a purge valve of a fuel system in a vehicle reduces or eliminates false failures. The method is executed on an engine control module (ECM) and is configured to determine when vehicle soak ... | 04/01/2008 |
| 7350399 | Leakage detecting device for evaporating fuel processing apparatus A leakage detecting device is connected to an evaporating fuel processing apparatus to detect leakage of evaporating fuel in a ventilation apparatus that includes an electric pump, a fuel tank, and a filter. The electric pump includes a pump portion and a motor port... | 04/01/2008 |
| 7347194 | Leak diagnosis device Concentration measurement is performed multiple times from a period in which pressure in a purge device increases due to generation of fuel vapor after operation of an engine is stopped. A concentration stabilization period, in which a change in the fuel vapor conce... | 03/25/2008 |
| 7347087 | Engine oil leak test system and method A system and method for testing partially assembled engines for possible oil leaks. The system includes engine pressurizing devices that are automatically controlled by a controller according to a predetermined control program based upon the engine model type being ... | 03/25/2008 |
| 7347082 | Method and apparatus for testing vehicle fuel system integrity A method and apparatus for measuring leakage of a vehicle fuel system includes providing an apparatus having a gas source, a pressure meter and a reference orifice and connecting the apparatus to the fuel system. The fuel system is pressurized with the source. A fir... | 03/25/2008 |
| 7337652 | Fuel system with leak location diagnostic features and component for same A leak diagnostic strategy for an engine equipped with a high pressure common rail fuel system includes a plurality of separate leak lines. Each of the leak lines is constructed and positioned to capture fuel leaking from one of several different high pressure space... | 03/04/2008 |
| 7334331 | Methods and apparatus for machining components A method of using a machining assembly to machine a plurality of different turbine components that include a dovetail having a contoured profile. The method includes removably coupling a first set of retainers into the machining assembly, the first set of retainers ... | 02/26/2008 |
| 7318425 | Fuel vapor treatment apparatus A fuel vapor treatment apparatus includes a first canister, a purge passage, an atmosphere passage, a first detection passage provided with a restrictor, and a passage-changing valve for changing the connection passage of the first detection passage between the purg... | 01/15/2008 |
| 7290535 | Leak diagnostic device for fuel vapor treatment device A lag time is set in a period from the time when a leak down is finished to the time when measurement of the amount of fuel vapor is started for the purpose of returning a deformed fuel tank to its original shape. A fuel vapor amount estimating means is provided tha... | 11/06/2007 |
| 7284530 | Leak detector for fuel vapor purge system A suction pump introduces negative pressure into a reference-pressure-detecting portion. A driving voltage V of the suction pump is adjusted in such a manner that pressure Pr in the reference-pressure-detecting portion is within a target pressure range. When the pre... | 10/23/2007 |
| 7278547 | Cap device A fuel cap has a male threading element which is formed on an outer circumference of a closer of the fuel cap, a female threading element which is formed on an inner wall of a filler neck, and a handle. Rotation of the handle in a closing direction screws the male t... | 10/09/2007 |
| 7275417 | Fueling system vapor recovery and containment performance monitor and method of operation thereof A method and apparatus for monitoring and determining fuel vapor recovery performance is disclosed. The dispensing of liquid fuel into a tank by a conventional gas pump nozzle naturally displaces a mixture of air and fuel ullage vapor in the tank. These displaced va... | 10/02/2007 |
