Patent application number | Description | Published |
20100147058 | FUEL INJECTOR DIAGNOSTIC SYSTEM AND METHOD FOR DIRECT INJECTION ENGINE - A fuel injector diagnostic system includes a fuel pump control module, a pressure sensor, and a diagnostic module. The fuel pump control module disables delivery of fuel to a fuel rail of an engine. The pressure sensor measures a first pressure of the fuel rail before an injection event and a second pressure of the fuel rail after the injection event on at least one of a plurality of injectors when the engine is running. The diagnostic module diagnoses a fault in the at least one of the injectors based on the first pressure and the second pressure. | 06-17-2010 |
20100199951 | ADAPTIVE CONTROL OF FUEL DELIVERY IN DIRECT INJECTION ENGINES - An adaptive fuel delivery control system includes a pressure monitoring module and a flow rate determination module. The pressure monitoring module determines an actual pressure drop after a fuel injection event on an injector. The flow rate determination module determines an adjusted flow rate based on a reference flow rate and the pressure drop. | 08-12-2010 |
20100206269 | FUEL INJECTOR FLOW CORRECTION SYSTEM FOR DIRECT INJECTION ENGINES - A fuel control system for an engine includes a control module that includes a fuel rail pressure module and a comparison module. The fuel rail pressure module determines a first fuel rail pressure of a fuel rail after a first event and a second fuel rail pressure of the fuel rail after a second event. The first event includes N conditions, a first of the N conditions comprises deactivation of a fuel pump of the engine, and N is an integer. The second event includes M conditions, a first of the M conditions comprises activation of a fuel injector, and M is an integer. The comparison module adjusts a fuel injector constant of the fuel injector based on the first fuel rail pressure, the second fuel rail pressure, and an injector activation period corresponding to the second event. | 08-19-2010 |
20100224169 | METHOD AND APPARATUS FOR CONTROLLING FUEL RAIL PRESSURE USING FUEL PRESSURE SENSOR ERROR - A control system and method for controlling a fuel system of an engine includes a steady state determination module determining the engine is operating at a steady state and a memory storing a first fuel correction. A fuel pump control module commands a predetermined fuel rail pressure change. The memory stores a second fuel correction after the predetermined fuel rail pressure change. A sensor error correction module determines a fuel rail pressure sensor error based on the first fuel correction and the second fuel correction and determines a fuel rail pressure in response to the sensor error. | 09-09-2010 |
20100263630 | FUEL PUMP CONTROL SYSTEM AND METHOD - A control system includes a fuel pump control module and a diagnostic module. The fuel pump control module controls a fuel pump to provide fuel to a fuel rail. The diagnostic module controls the fuel pump control module to provide a predetermined amount of fuel to the fuel rail, determines an estimated pressure increase within the fuel rail based on the predetermined amount of fuel, and compares an actual pressure increase within the fuel rail to the estimated pressure increase. The fuel pump control module selectively controls the fuel pump based on the comparison. | 10-21-2010 |
20100268439 | CONTROL OF FUEL PUMP BY QUANTIFYING PERFORMANCE - An engine control system comprises a fuel pump control module and a diagnostic module. The fuel pump control module controls a pressure pump to inject fuel into a fuel rail. The diagnostic module determines an estimated pressure increase within the fuel rail based on the injected fuel, compares an actual pressure increase within the fuel rail to the estimated pressure increase, and indicates when the actual pressure increase is less than the estimated pressure increase. | 10-21-2010 |
20110226216 | IDLE SPEED REDUCTION SYSTEMS AND METHODS - An idle control system for a vehicle comprises an actuator control module, a torque determination module, a deviation analysis module, and an idle speed reduction module. The actuator control module regulates an engine speed based on a desired idle speed when an engine idle mode is enabled. The torque determination module determines actual torques for a cylinder of an engine while the engine idle mode is enabled. The deviation analysis module determines a standard deviation based on more than one of the actual torques while the engine idle mode is enabled. The idle speed reduction module determines an idle speed reduction based on the standard deviation and decreases the desired idle speed based on the idle speed reduction. | 09-22-2011 |
20110239984 | METHOD AND SYSTEM FOR ENABLING CYLINDER BALANCING AT LOW IDLE SPEED USING CRANKSHAFT SPEED SENSOR - A method and control system for controlling the idle speed of an engine includes an engine speed module that generates an engine speed signal. The control system also includes an actuator control module that regulates an engine speed based on a desired idle speed when an engine idle mode is enabled and a balancing module that balances torque produced by cylinders of an engine based on the engine speed signal when the engine idle mode is enabled. The control module also includes an idle speed reduction module that determines an idle speed reduction based on the actual torques produced by the cylinders after the balancing module balances the torque and that decreases the desired idle speed based on the idle speed reduction. | 10-06-2011 |
20110265560 | ENGINE MISFIRE DETECTION SYSTEMS AND METHODS USING DISCRETE FOURIER TRANSFORM APPROXIMATION - A method of detecting a misfire of an engine includes determining a range of sub-harmonic frequencies of one of a crankshaft sensor signal and an engine speed signal. The range of sub-harmonic frequencies is determined based on a fundamental frequency. The sub-harmonic frequencies are less than the fundamental frequency. Frequency content magnitudes are generated based on the range of the sub-harmonic frequencies and a Discrete Fourier Transform of at least one of the crankshaft sensor signal and an engine speed signal. An energy from velocity non-uniformity (EVN) signal is generated based on the frequency content magnitudes and the range of the sub-harmonic frequencies. The misfire is detected based on the EVN signal and a misfire threshold. | 11-03-2011 |