Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7377273 | Air-fuel ratio control apparatus for internal combustion engine A common fuel injection amount is calculated for the cylinders of a first cylinder group, which performs a rich burn process, and the cylinders of a second cylinder group, which performs a lean burn process. The calculated fuel injection amount is corrected with an ... | 05/27/2008 |
| 7328673 | Valve timing correction control apparatus and method for an internal combustion engine A valve timing correction control apparatus for an internal combustion engine is provided. The engine includes a plurality of banks and variable valve operating mechanisms disposed at the respective banks for variably controlling valve timings of intake valves separ... | 02/12/2008 |
| 7269993 | Gas detecting apparatus, gas detecting method and fuel cell vehicle The gas detecting system of the present invention is equipped with a catalytic combustion type gas sensor 1a and a semiconductor type gas sensor 1b, in a gas detecting system 1 having an operating sate in which generation of electr... | 09/18/2007 |
| 7177711 | Interface module An interface module is proposed, to which sensors are connected and which is positioned in a control device, it being indicated via an identification input how the sensor data are to be classified by the interface module. In particular, this can be used to distingui... | 02/13/2007 |
| 7159547 | Control apparatus for multi-cylinder internal combustion engine and control method A control apparatus calculates a exhaust gas air-fuel ratio of a plurality of cylinders, in which the operation angle of an intake valve is set to a predetermined operation angle, e.g., a maximum operation angle, based on a value output from an air-fuel ratio sensor... | 01/09/2007 |
| 7103467 | Device for detecting response characteristics of sensor When the output of the AFR ratio sensor is stable in a steady operating state, the amount of fuel is increased by step inputting to detect a point where the gradient of change in the sensor output exceeds a threshold value as a point of start of change. The time fro... | 09/05/2006 |
| 7030742 | Dual channel air/fuel ratio gauge There is provided an air/fuel ratio gauge for monitoring an engine exhaust mixture of an engine having a plurality of oxygen sensors. The gauge of the present invention comprises a gauge housing. A gauge controller is disposed within the gauge housing and is electri... | 04/18/2006 |
| 7021046 | Engine system and method for efficient emission control device purging Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, ... | 04/04/2006 |
| 7010416 | Systems and methods for resetting vehicle emission system error indicators A method of resetting an active emissions system error indictor associated with a vehicle. The method comprises performing a first requesting step and a second requesting step until the active emissions system error indicator resets in response to the first or secon... | 03/07/2006 |
| 6938410 | Temperature management of catalyst system for a variable displacement engine A system and method for controlling an internal combustion engine having a plurality of cylinders, at least some of which may be selectively deactivated to provide variable displacement operation, including temperature management of at least one engine/vehicle compo... | 09/06/2005 |
| 6882928 | Enhanced diagnosis of a multi-banked catalyst exhaust system Methods and apparatus are provided for diagnosing emissions in a multi-banked catalyst emissions system for a motor vehicle. A method of diagnosing emissions in a multi-banked emissions system suitably includes obtaining an emissions measurement for each bank in the... | 04/19/2005 |
| 6631611 | Methodology of robust initialization of catalyst for consistent oxygen storage capacity measurement A method of initializing the catalyst converter for monitoring the conversion efficiencies of a catalytic converter by measuring the oxygen storage capacity (OSC) of the converter. The measurement of the OSC indicates the degree of health of the converter... | 10/14/2003 |
| 6615812 | Method and arrangement for operating an internal combustion engine The invention relates to a method and an arrangement for operating an internal combustion engine wherein at least one control quantity of the engine is influenced in dependence upon a signal representing the fresh air charge. The throttle flap angle and t... | 09/09/2003 |
| 6567738 | Fueling control system A method for controlling air-fuel ratio of an engine coupled to an emission control device uses an upstream linear exhaust gas sensor and a switching downstream exhaust gas sensor. During stoichiometric operation, both sensors are used for feedback contro... | 05/20/2003 |
| 6550466 | Method for controlling the frequency of air/fuel ratio oscillations in an engine A method for controlling first and second air/fuel ratio oscillations in first and second cylinder groups, respectively, of an internal combustion engine is provided. The method includes determining a first frequency of the first air/fuel ratio oscillatio... | 04/22/2003 |
| 6470867 | Multi cylinder internal combustion engine comprising a cylinder head internally defining exhaust passages In a multi cylinder internal combustion engine comprising a cylinder head internally defining exhaust passages extending from a plurality of combustion chambers defined in part by the cylinder head, the exhaust passages converging into a converging area a... | 10/29/2002 |
| 6371097 | UEGO control circuit board portion with ASIC A method and apparatus for controlling universal exhaust gas oxygen (UEGO) sensors comprises an application specific integrated circuit (ASIC) that includes a sensor control utilizing proportional-integral-derivative control loop, sensor drivers for gener... | 04/16/2002 |
| 6324835 | Engine air and fuel control A control method for an internal combustion engine has multiple cylinder groups with at least one control device positioned between an intake manifold and a cylinder group. The engine operates the cylinder groups at different air/fuel ratios and uses the ... | 12/04/2001 |
| 6202415 | Method and device for monitoring the functioning of two exhaust-gas turbochargers A separate irregular-running determination is carried out for each cylinder bank. Each ascertained irregular-running value is compared to a lower and an upper threshold value, the upper threshold value being set in such a way that all irregular-running va... | 03/20/2001 |
| 6182498 | Oxygen sensor An oxygen sensor is disposed behind an exhaust gas purifying catalyst for an internal combustion engine and which suppresses the influence of unburnt hydrocarbon on the output voltage. A sensor element 1 is provided with a detection electrode 4 on the out... | 02/06/2001 |
| 6067794 | Dual control loop system and method for internal combustion engines A method and system for controlling fuel injected into an internal combustion engine fitted with a catalytic converter. A signal outputted by a first feedback loop and derived from the output of a first probe upstream from the catalytic converter is corre... | 05/30/2000 |
| 6055970 | Control system for an outboard motor A control system for an outboard motor is disclosed. The control system includes a feedback control which obtains feedback data from a combustion condition sensor. The motor includes an engine positioned in a cowling and having a vertically extending outp... | 05/02/2000 |
| 6018945 | Air-fuel ratio control device for engine An air-fuel ratio control device for an engine comprises a three way catalyst arranged in the exhaust passage, an upstream-side air-fuel ratio sensor arranged in the exhaust passage upstream of the three way catalyst, and an downstream-side air-fuel ratio... | 02/01/2000 |
| 6000218 | System for monitoring the functioning ability of catalytic converters and/or lambda sensors A system for monitoring the operatibility of catalytic converters and/or lambda probes in exhaust gas detoxification systems. It is characterised in that a pollutant sensor is placed downstream of (in relation to the exhaust gas stream) or in the catalyti... | 12/14/1999 |
| 5974786 | Adaptive time window to synchronize pre- and post-catalyst oxygen sensor switch counters A system and method for monitoring efficiency of a catalytic converter count switches of at least one upstream sensor interposed the engine and the converter and count switches of a downstream sensor, interposed the converter and atmosphere, during a defi... | 11/02/1999 |
| 5970707 | Exhaust gas purification device for an internal combustion engine In an exhaust gas purification device for an internal combustion engine, a three-way catalyst and a NOX occluding and reducing catalyst (a NORC) are disposed in the exhaust gas passage of an engine in this order from the upstream side. A first ... | 10/26/1999 |
| 5954039 | Air/fuel ratio control system An air/fuel control system (8) and method for an engine (28) having two engine banks coupled to a single catalytic converter (50) uses first and second exhaust gas oxygen sensors (44, 55) coupled to respective first and second exhaust manifolds (56, 57) a... | 09/21/1999 |
| 5767386 | Exhaust gas sensor and circuit configuration for the exhaust gas sensor An exhaust gas sensor has first and second sensor elements. Exhaust gas surroundings of the first sensor element are catalytically activated, so that an oxygen partial pressure which is in equilibrium will always be measured by the first sensor element, r... | 06/16/1998 |
| 5598702 | Method and apparatus for controlling the air-fuel ratio of an internal combustion engine In a device having air-fuel ratio sensors upstream and downstream of an exhaust gas purifying catalytic converter with learning carried out based on output values from the downstream air-fuel ratio sensor, independent learning is carried out depending on ... | 02/04/1997 |
| 5537321 | Diagnostic apparatus for controlling the operation of a catalytic converter An exhaust gas purifying apparatus mounted in an vehicular engine, which includes a detector for detecting the actuated condition of a catalyst. Injectors for fuel injection are disposed along an air intake passage of the engine and plurality of catalysts... | 07/16/1996 |
| 5533332 | Method and apparatus for self diagnosis of an internal combustion engine With an air-fuel ratio control apparatus for an internal combustion engine wherein oxygen sensors are respectively arranged upstream and downstream of an exhaust gas purification catalytic converter, air-fuel ratio feedback control is carried out for diag... | 07/09/1996 |
| 5515834 | Air-fuel ratio control system for an internal combustion engine An air-fuel control system for an internal combustion engine is provided in which air-fuel ratio control system a deviation effect due to an amount of evaporated fuel distributed to each cylinder group differing from cylinder group to cylinder group is el... | 05/14/1996 |
| 5485382 | Oxygen sensor deterioration-detecting system for internal combustion engines An oxygen sensor deterioration-detecting system for an internal combustion engine having a plurality of groups of cylinders groups, an exhaust system having a plurality of exhaust passages extending, respectively, from the cylinder groups, and catalytic c... | 01/16/1996 |
| 5473888 | Air-fuel ratio control system for internal combustion engine An air-fuel ratio control system for an internal combustion engine utilizes a pre-stored standard relation between an air-fuel ratio sensor signal and a standard air-fuel ratio indicative value for deriving the standard air-fuel ratio indicative value bas... | 12/12/1995 |
| 5426934 | Engine and emission monitoring and control system utilizing gas sensors An engine monitoring system and/or emission reduction system is provided for use in conjunction with an internal combustion engine. The system includes a plurality of sensors which detect various engine operating conditions and in which each sensor genera... | 06/27/1995 |
| 5426935 | Air-fuel ratio control system for internal combustion engines An air-fuel ratio control system for an internal combustion engine includes a LAF sensor and an O2 sensor arranged in an exhaust pipe at respective locations upstream and downstream of a catalytic converter. A desired air-fuel ratio coefficient used in ca... | 06/27/1995 |
| 5417060 | Air fuel ratio control apparatus for an internal combustion engine An air fuel ratio controlling apparatus for an internal combustion engine, comprises: a catalytic converter, provided in an exhaust system for purifying an exhaust gas of the engine; a first oxygen density sensor, provided upstream from the catalytic conv... | 05/23/1995 |
| 5414995 | Failure detection system for air-fuel ratio control system A failure detection system for an air-to-fuel ratio control system includes a exhaust gas monitor positioned upstream of a catalytic converter for monitoring an emission content of exhaust gas based on which an air-to-fuel ratio is feedback controlled so ... | 05/16/1995 |
| 5402640 | Air-fuel ratio control system of internal combustion engine An air-fuel ratio control system for an internal combustion engine comprises a catalytic converter disposed in an exhaust line of the engine. The converter has an oxygen storage effect. First and second oxygen sensors are disposed in the exhaust line at p... | 04/04/1995 |
| 5375415 | Adaptive control of EGO sensor output An engine air/fuel feedback control system adjusts the engine air/fuel ratio in response to a modified output of an exhaust gas oxygen sensor. A sensor output is compared to a reference at its nominal midpoint to develop a two-state signal indicating oper... | 12/27/1994 |
