Patent application number | Description | Published |
20090306875 | FUEL COMPOSITION RECOGNITION AND ADAPTATION SYSTEM - A method of operating an internal combustion engine. The method including monitoring a pressure in a combustion chamber of the engine during a compression stroke, determining whether a fuel composition has changed from a first composition to a second composition based at least in part on the monitored pressure, and triggering a fuel composition adaptation in response to a determination that the fuel composition has changed. | 12-10-2009 |
20120253634 | ADJUSTING THE SPECIFICITY OF AN ENGINE MAP BASED ON THE SENSITIVITY OF AN ENGINE CONTROL PARAMETER RELATIVE TO A PERFORMANCE VARIABLE - Methods and systems for engine control optimization are provided. A first and a second operating condition of a vehicle engine are detected. An initial value is identified for a first and a second engine control parameter corresponding to a combination of the detected operating conditions according to a first and a second engine map look-up table. The initial values for the engine control parameters are adjusted based on a detected engine performance variable to cause the engine performance variable to approach a target value. A first and a second sensitivity of the engine performance variable are determined in response to changes in the engine control parameters. The first engine map look-up table is adjusted when the first sensitivity is greater than a threshold, and the second engine map look-up table is adjusted when the second sensitivity is greater than a threshold. | 10-04-2012 |
20120253635 | PERTURBING ENGINE PERFORMANCE MEASUREMENTS TO DETERMINE OPTIMAL ENGINE CONTROL SETTINGS - Methods and systems for optimizing a performance of a vehicle engine are provided. The method includes determining an initial value for a first engine control parameter based on one or more detected operating conditions of the vehicle engine, determining a value of an engine performance variable, and artificially perturbing the determined value of the engine performance variable. The initial value for the first engine control parameter is then adjusted based on the perturbed engine performance variable causing the engine performance variable to approach a target engine performance variable. Operation of the vehicle engine is controlled based on the adjusted initial value for the first engine control parameter. These acts are repeated until the engine performance variable approaches the target engine performance variable. | 10-04-2012 |
20120253636 | CONCURRENTLY ADJUSTING INTERRELATED CONTROL PARAMETERS TO ACHIEVE OPTIMAL ENGINE PERFORMANCE - Methods and systems for real-time engine control optimization are provided. A value of an engine performance variable is determined, a value of a first operating condition and a value of a second operating condition of a vehicle engine are detected, and initial values for a first engine control parameter and a second engine control parameter are determined based on the detected first operating condition and the detected second operating condition. The initial values for the first engine control parameter and the second engine control parameter are adjusted based on the determined value of the engine performance variable to cause the engine performance variable to approach a target engine performance variable. In order to cause the engine performance variable to approach the target engine performance variable, adjusting the initial value for the first engine control parameter necessitates a corresponding adjustment of the initial value for the second engine control parameter. | 10-04-2012 |
20120253637 | DEFINING A REGION OF OPTIMIZATION BASED ON ENGINE USAGE DATA - Methods and systems for engine control optimization are provided. One or more operating conditions of a vehicle engine are detected. A value for each of a plurality of engine control parameters is determined based on the detected one or more operating conditions of the vehicle engine. A range of the most commonly detected operating conditions of the vehicle engine is identified and a region of optimization is defined based on the range of the most commonly detected operating conditions of the vehicle engine. The engine control optimization routine is initiated when the one or more operating conditions of the vehicle engine are within the defined region of optimization. | 10-04-2012 |
20130073173 | DYNAMIC ESTIMATOR FOR DETERMINING OPERATING CONDITIONS IN AN INTERNAL COMBUSTION ENGINE - Methods and systems are provided for estimating engine performance information for a combustion cycle of an internal combustion engine. Estimated performance information for a previous combustion cycle is retrieved from memory. The estimated performance information includes an estimated value of at least one engine performance variable. Actuator settings applied to engine actuators are also received. The performance information for the current combustion cycle is then estimated based, at least in part, on the estimated performance information for the previous combustion cycle and the actuator settings applied during the previous combustion cycle. The estimated performance information for the current combustion cycle is then stored to the memory to be used in estimating performance information for a subsequent combustion cycle. | 03-21-2013 |
20130073185 | PREDICTIVE MODELING AND REDUCING CYCLIC VARIABILITY IN AUTOIGNITION ENGINES - Methods and systems are provided for controlling a vehicle engine to reduce cycle-to-cycle combustion variation. A predictive model is applied to predict cycle-to-cycle combustion behaviour of an engine based on observed engine performance variables. Conditions are identified, based on the predicted cycle-to-cycle combustion behaviour, that indicate high cycle-to-cycle combustion variation. Corrective measures are then applied to prevent the predicted high cycle-to-cycle combustion variation. | 03-21-2013 |
20130090837 | FUEL GOVERNOR FOR CONTROLLED AUTOIGNITION ENGINES - Methods and systems for controlling combustion performance of an engine are provided. A desired fuel quantity for a first combustion cycle is determined. One or more engine actuator settings are identified that would be required during a subsequent combustion cycle to cause the engine to approach a target combustion phasing. If the identified actuator settings are within a defined acceptable operating range, the desired fuel quantity is injected during the first combustion cycle. If not, an attenuated fuel quantity is determined and the attenuated fuel quantity is injected during the first combustion cycle. | 04-11-2013 |
20130090838 | FUELING STRATEGY FOR CONTROLLED-AUTOIGNITION ENGINES - Methods and systems for controlling combustion performance of an engine during recompression HCCI combustion are provided. The method includes regulating a valve actuation timing and a fuel injection timing to cause a combustion phasing of at least one cylinder of the engine to approach a target combustion phasing, and estimating current combustion state information based on the combustion phasing. The current combustion state information includes at least one of a temperature, a pressure, and a pre-combustion charge composition associated with the at least one cylinder. The method further includes determining a target fuel injection amount, and determining whether the target fuel injection amount would require actuator settings that violate predetermined constraints in order to cause the combustion phasing to approach the target combustion phasing. A fuel injection amount is adjusted when the target fuel injection amount would require actuator settings that violate the predetermined constraints. | 04-11-2013 |
20130125544 | COMBUSTION MODE SWITCHING WITH A TURBOCHARGED/SUPERCHARGED ENGINE - A method for switching between low- and high-dilution combustion modes in an internal combustion engine having an intake passage with an exhaust-driven turbocharger, a crankshaft-driven positive displacement supercharger downstream of the turbocharger and having variable boost controllable with a supercharger bypass valve, and a throttle valve downstream of the supercharger. The current combustion mode and mass air flow are determined. A switch to the target combustion mode is commanded when an operating condition falls within a range of predetermined operating conditions. A target mass air flow to achieve a target air-fuel ratio corresponding to the current operating condition and the target combustion mode is determined. The degree of opening of the supercharger bypass valve and the throttle valve are controlled to achieve the target mass air flow. The amount of residual exhaust gas is manipulated. | 05-23-2013 |
20130131957 | PATH PLANNING DURING COMBUSTION MODE SWITCH - Systems and methods are provided for transitioning between a first combustion mode and a second combustion mode in an internal combustion engine. A current operating point of the engine is identified and a target operating point for the internal combustion engine in the second combustion mode is also determined. A predefined optimized transition operating point is selected from memory. While operating in the first combustion mode, one or more engine actuator settings are adjusted to cause the operating point of the internal combustion engine to approach the selected optimized transition operating point. When the engine is operating at the selected optimized transition operating point, the combustion mode is switched from the first combustion mode to the second combustion mode. While operating in the second combustion mode, one or more engine actuator settings are adjusted to cause the operating point of the internal combustion to approach the target operating point. | 05-23-2013 |
20140026852 | COMBUSTION CONTROL WITH EXTERNAL EXHAUST GAS RECIRCULATION (EGR) DILUTION - Methods and system are described for controlling the performance of a vehicle engine in multiple combustion modes. A first engine control variable is identified that has primary control authority of a first engine performance variable—such as, for example, combustion phasing—in a first engine combustion mode. The first engine performance variable is then adjusted by adjusting the first engine control variable when operating in the first engine combustion mode. A second engine control variable is identified that has primary control authority of the first engine performance variable in a second engine combustion mode. The first engine performance variable is adjusted by adjusting the second engine control variable when operating in the second engine combustion mode. | 01-30-2014 |
20140230780 | REAL-TIME RESIDUAL MASS ESTIMATION WITH ADAPTIVE SCALING - Systems and methods are described for on-line, real-time estimation of a residual mass in an engine cylinder during HCCI combustion. The residual mass is estimated based on an estimated residual mass for a previous combustion cycle. A value of a first performance variable for the first combustion cycle is determined based only on engine data measured by one or more sensors. A value of a second performance is estimated based at least in part on the estimated residual mass for the first combustion cycle. An adaptive scaling factor is determining for the first combustion cycle based on the determined value of the first performance variable and the estimated value of the second performance variable. An adjusted residual mass for the first combustion cycle is then determined based on the estimated residual mass for the first combustion cycle and the adaptive scaling factor for the first combustion cycle. | 08-21-2014 |
20140283800 | MIXED-MODE COMBUSTION CONTROL - Methods and systems are described for controlling engine combustion during a mixed-mode combustion modality. A target exhaust valve timing is determined based on a first combination of engine speed and load. An amount of trapped residual in an engine cylinder after an exhaust valve is closed during a first combustion cycle is also determined. Based at least in part on the amount of trapped residual, an amount of gas that will be drawn into the engine cylinder when the intake valve is opened during a second combustion cycle is determined. The target exhaust valve timing is then adjusted during the second combustion cycle in order to adjust the amount of gas that will be drawn into the engine cylinder when the intake valve is opened during a third combustion cycle. | 09-25-2014 |