Patent application number | Description | Published |
20080221765 | Torque converter clutch control system - A control system is provided. The control system includes a timer module that receives a first torque converter clutch (TCC) apply request and estimates at least one of a message latency time and a hydraulic latency time. A control module receives a subsequent TCC apply request and generates a torque request for an engine based on the at least one of the hydraulic latency time and the torque message latency time. | 09-11-2008 |
20080257305 | SYSTEM FOR CONTROLLING FUEL INJECTORS - An injector control system and method for an engine includes a distribution module that calculates a difference between a first average engine speed and a second average engine speed of an engine and a fuel offset module that offsets a learned fuel amount of a first fuel injector of a plurality of fuel injectors based on the difference. The learned fuel amount corresponds to an engine fueling range. | 10-23-2008 |
20090240407 | ENGINE CONTROL DURING COASTING EVENTS - An engine control system comprises a coasting identification module, a throttle adjustment module, and a fuel adjustment module. The coasting identification module selectively identifies a coasting event. The throttle adjustment module increases an opening of a throttle valve during the coasting event. The fuel adjustment module decreases fuel provided to an engine during the coasting event. | 09-24-2009 |
20120065849 | SYSTEM AND METHOD FOR CONTROLLING POWER DOWNSHIFTS OF A TRANSMISSION - A system for controlling power downshifts of a transmission includes a flare generation module, a flare control module, and a shift control module. The flare generation module generates turbine speed flare by decreasing pressure applied to an off-going clutch of the transmission. The flare control module decreases the turbine speed flare by increasing the pressure applied to the off-going clutch of the transmission. The shift control module increases a pressure applied to an on-coming clutch of the transmission when the turbine speed flare is less than a predetermined amount from a desired turbine speed flare. | 03-15-2012 |
20130231834 | TRANSMISSIOIN CLUTCH RETURN SPRING PRESSURE LEARN USING PID CONTROL - A method for determining the return spring pressure of a clutch in a vehicle transmission includes using proportion-integral-derivative (PID) control logic of a controller to introduce a calibrated error into a pressure command of a holding clutch during a coast-down maneuver of the vehicle. The calibrated error causes a slip level to occur across the holding clutch. The method includes maintaining the slip level using the PID control logic and separately commanding engine torque at different threshold low values during the coast-down maneuver. The pressure/input torque relationship for the holding clutch is recorded for both threshold low levels as the controller continues to maintain the slip. The return spring pressure is calculated using the recorded pressure/input torque relationship. The holding clutch may be controlled a subsequent shift maneuver using the learned return spring pressure. A vehicle is also disclosed having a controller configured to execute steps of the method. | 09-05-2013 |
20130231835 | DETERMINATION OF TRANSMISSION CLUTCH CONTROL VALUES USING PID CONTROL LOGIC DURING POWER-ON UPSHIFT - Clutch control values are determined via a method in a vehicle during a power-on upshift. Pressure to an offgoing clutch is decreased to a calibrated holding pressure after onset of the upshift. Proportional-integral-derivative (PID) logic of a controller is used to introduce a calibrated error into a pressure command to the offgoing clutch during fill of the oncoming clutch. This causes a calibrated slip to occur across the offgoing clutch, and a resultant threshold amount of flare to occur in turbine speed. The slip and flare are held using the PID logic. The pressure/torque relationship of the offgoing clutch is recorded. A fill level of the oncoming clutch is determined using a trajectory of an integrator term of the PID logic. A control value of the oncoming or the offgoing clutch is adjusted using at least one of the fill level, the recorded clutch pressure, and the recorded clutch torque. | 09-05-2013 |
20130245902 | CONTROLLING TIP-IN BUMP PERFORMANCE IN A TRANSMISSION - A method of managing tip-in bump in an automatic transmission includes detecting a set of conditions indicative of an impending throttle tip-in event, including calculating a speed difference between engine speed and turbine speed, and reducing a pressure command to a designated clutch of the transmission to a threshold level. The method also include setting an upper limit on engine torque, flaring the turbine speed during the tip-in event, and using proportional-integral-derivative control logic of a controller to reduce flare to about zero in a calibrated duration, thereby allowing the clutch to dissipate engine inertia and minimize the severity of the tip-in bump. A transmission in a vehicle is operatively connected to an engine and has a torque converter with a turbine. The transmission includes a clutch and a controller configured to manage tip-in bump performance in the transmission via the above method. | 09-19-2013 |
20130245904 | SYSTEM AND METHOD FOR DETERMINING CLUTCH GAINS IN A TRANSMISSION DURING A POWER DOWNSHIFT - A method of controlling an offgoing clutch in a transmission during a power downshift includes detecting the downshift, reducing a pressure command to the offgoing clutch, and introducing a calibrated error value to a pressure command for the offgoing clutch during the inertia phase. The method also includes synchronizing the speed of the offgoing and an oncoming clutch during the torque phase, determining the offgoing clutch pressure and torque after synchronizing clutch speeds, and then recording a clutch gain as a function of the offgoing clutch pressure and torque. The recorded clutch gains are used to control a subsequent power downshift of the transmission. A controller using proportional-integral-derivative (PID) control logic introduces the error as PID error in a pressure control signal, and controls slip across the offgoing clutch. A transmission is also disclosed having an offgoing clutch and controller configured to execute the above method. | 09-19-2013 |
20140032063 | CLUTCH RETURN SPRING PRESSURE LEARNING DURING A COASTING MANEUVER - A method of learning the return spring pressure of a clutch in a vehicle having an engine and an automatic transmission includes selecting a clutch for analysis from a plurality of clutches of the transmission when the vehicle coasts for a predetermined duration. The method includes ramping down clutch pressure to the selected clutch until engine speed reaches idle and measuring the clutch pressure for the selected clutch after engine speed has remained at idle for a calibrated duration. An actual return spring pressure may be calculated as a function of the preliminary return spring pressure. The actual return spring pressure may be used thereafter to control a subsequent shift event of the transmission. A vehicle includes an engine, transmission, and controller configured to detect a predetermined coasting condition, and to execute code using a processor to thereby execute the above method. A system includes the transmission and controller. | 01-30-2014 |
20140032064 | DETERMINING ONCOMING CLUTCH PRESSURE IN A TRANSMISSION - Clutch pressure of an oncoming clutch may be determined during an upshift in an automatic transmission by determining when offgoing and oncoming clutches of the transmission near a speed synchronization point. Aboard a vehicle, proportional-integral-derivative (PID) feedback control logic of for the oncoming clutch may be activated via a controller. The controller and the activated PID logic may be used to introduce a calibrated slip error between the rotational speeds of the offgoing and oncoming clutches. Engine speed is then held in a calibrated flare using the PID logic. Oncoming clutch pressure is recorded during the duration of the calibrated flare, and a control action is executed with respect to the transmission using the recorded oncoming clutch pressure, e.g., using recorded PID gains and/or a pressure/torque relationship of the oncoming clutch. A vehicle having an engine, transmission, and controller may use the controller to execute such a method. | 01-30-2014 |