Abstract: Components, subassemblies, systems, and/or methods for continuously variable transmissions (CVT) having a control system adapted to facilitate a change in the ratio of a CVT are described. In one embodiment, a control system includes a stator plate configured to have a plurality of radially offset slots. Various traction planet assemblies and stator plates can be used to facilitate shifting the ratio of a CVT. In some embodiments, the traction planet assemblies include planet axles configured to cooperate with the stator plate. In one embodiment, the stator plate is configured to rotate and apply a skew condition to each of the planet axles. In some embodiments, a stator driver is operably coupled to the stator plate. Embodiments of a traction sun are adapted to cooperate with other components of the CVT to support operation and/or functionality of the CVT.

Abstract: An electronic controller for a variable ratio transmission and an electronically controllable variable ratio transmission including a variator or other CVT are described herein. The electronic controller can be configured to receive input signals indicative of parameters associated with an engine coupled to the transmission. The electronic controller can also receive one or more control inputs. The electronic controller can determine an active range and an active variator mode based on the input signals and control inputs. The electronic controller can control a final drive ratio of the variable ratio transmission by controlling one or more electronic solenoids that control the ratios of one or more portions of the variable ratio transmission.

Abstract: A gas turbine engine according to an exemplary aspect of the present disclosure includes a windmill pump driven by a spool. A first pump driven by said spool with an air-oil cooler is located downstream of the first pump. A second pump is also driven the spool with an air-air precooler located downstream of the second pump. A method of operating a gas turbine engine during a “windmilling” condition includes driving a windmill pump with a spool during a “windmilling ” condition. A lubricant is communicated to a geared architecture with the windmill pump. A first pump is driven by the spool and an air-oil cooler is located downstream of the first pump.

Abstract: A gas turbine engine includes a first and second pump driven by a spool. An Air-Oil Cooler downstream of the first pump. An air-air precooler is downstream of the second pump, the air-air precooler downstream of the Air-Oil Cooler.

Abstract: A gas turbine engine according to an exemplary aspect of the present disclosure includes, among other things, a fan section including a fan, a geared architecture, a spool which drives the fan through the geared architecture, and at least one component geared to the spool and being operable to control a speed of the spool during a “windmilling” condition. A method of gas turbine engine operations during a “windmilling” condition is also disclosed.

Abstract: A gas turbine engine includes a constant speed transmission driven by a spool. The constant speed transmission drives a first pump and a second pump. In a further non-limiting example, the first pump is driven by a first drive shaft which is driven by the constant speed transmission and the second pump is driven by a second drive shaft which is driven by the first shaft through a gearbox to provide a constant speed ratio between the first shaft and the second shaft.

Abstract: In a linear solenoid 107n, an electromagnetic coil 71n, a pressure sensor 72n, and label resistors 73n and 74n for correcting an inherent variation in a pressure detection characteristic are integrated; the standard characteristic of the pressure sensor 72n is stored in a control module 120M; when driving is started, the resistance values of the label resistors 73n and 74n are read, the pressure detection characteristic of the utilized pressure sensor 72n is corrected, and an excitation current for the electromagnetic coil 71n is controlled in such a way that a target adjusted hydraulic pressure is obtained. Even when due to a change in the oil temperature, the valve opening characteristic of the linear solenoid 107n changes, the adjusted hydraulic pressure is controlled to be constant.

Abstract: The shift control unit shifts the sub-transmission mechanism while changing the speed ratio of the variator in response to a change in the speed ratio of the sub-transmission mechanism so that the through speed ratio does not change after the through speed ratio is caused to reach the final through speed ratio by changing only the speed ratio of the variator if the speed ratio corresponding to the shift instruction from the driver is between a first speed ratio at which the sub-transmission mechanism is in the second gear position at the high speed side and the speed ratio of the variator is lowest and a second speed ratio at which the sub-transmission mechanism is in the first gear position at the low speed side and the speed ratio of the variator is highest when the manual mode is selected.

Abstract: A linear solenoid is configured with an electromagnetic coil and a label resistor that are integrated with each other; the label resistor has a resistance value corresponding to a correction coefficient based on the difference between the actual characteristic of the supply current vs. adjusted hydraulic pressure output of the electromagnetic coil and a standard characteristic; and data for correcting a characteristic variation in the command current vs. output current characteristic of an electromagnetic coil is preliminarily stored in a control module by use of an adjustment tool. When the operation is started, the resistance value of the label resistor is read and an output current corresponding to a utilized linear solenoid is supplied, so that a target adjusted hydraulic pressure is obtained.

Abstract: A method and system for executing a shift from a first fixed gear to a second fixed gear in a powertrain system comprising a two-mode, compound-split, electro-mechanical transmission operative to receive a speed input from an engine is described. It includes deactivating an off-going clutch, and generating a time-based profile for rotational speed of an oncoming clutch. The input speed is controlled based upon the rotational speed of the oncoming clutch and an output of the transmission. The oncoming clutch is actuated, preferably when the input speed is synchronized with a rotational speed of an output shaft of the transmission multiplied by a gear ratio of the second fixed gear, preferably after a predetermined elapsed period of time in the range of 500 milliseconds.

Abstract: A method for determining when in the course of a shift event an on-coming clutch gains torque capacity is provided. The method includes closed-loop controlling an off-going clutch to maintain a predetermined slip threshold by generating an off-going clutch pressure command, causing the on-coming clutch to engage during the closed loop control of the off-going clutch, generating a first derivative with respect to time of the off-going clutch pressure command, and using the first derivative to determine when the on-coming clutch gained torque capacity. A neural network method is preferably employed in analyzing the first derivative to locate a transition in the rate of commanded pressure indicative of off-going clutch release. A corresponding apparatus is also provided.

Abstract: The present invention relates to launch control of a vehicle having an automated manual transmission and an automated clutch selectively engaging an output of an engine to an input of the transmission. When a request for vehicle launch is detected, an output speed of the automated clutch and a desired clutch output torque are obtained. The automated clutch is partially engaged to allow for slip between an input to the clutch and an output from the clutch, and a desired amount of the slip between the input to the clutch and the output from the clutch is determined. A desired engine speed is calculated based on the desired amount of slip, with the engine torque automatically adjusted to obtain the desired engine speed.

Abstract: A microprocessor-based control system for a gas turbine electrical powerplant the microprocessor-based control system controls the startup, operation, and shutdown of the gas turbine electric powerplant. The microprocessor-based control system of the present invention dispenses with the need to utilize relays, timers, or other control hardware. Rather, the microprocessor-based control system employs software that replaces the control hardware, and directly reads the inputs, calculates the control actions, and writes the outputs. The microprocessor-based control system is also in electrical communication with an overspeed control system, provided to ensure that a runaway condition of the gas turbine engine does not occur should the gas turbine engine become disconnected from the speed reducer (gearbox) or generator. Sensors are used to monitor multiple operating conditions of the powerplant.

Abstract: Maintenance procedures for an article such as a component of a gas turbine engine are analyzed by defining a set of workscopes that may be performed upon the article, gathering maintenance frequency information for each type of subsequent trailing workscope that may be performed after a prior leading workscope, for a sample set of maintenance procedures, and determining a measured sample workscope mix in the form of a set of trailing workscope probabilities as a function of each leading workscope. A projected workscope mix is projected for a set of maintenance procedures from the measured sample workscope mix. From the projected workscope mix, labor, supplies, and monetary estimates for maintenance procedures may be calculated. Alternative maintenance strategies may be readily compared using this approach.

Abstract: Within the scope of the method for adjusting the ratio value for a continuously variable transmission having a variator, a minimum contact pressure force P1,min, and/or P2,min is continuously calculated for the two variator discs on the basis of the actual ratio and of the actual torque to be transmitted and according to the calculated contact pressure minimum force the primary or the secondary disc is determined as controlled variable to be used for the variator ratio, the controlled variable being determined by a comparison of the required pressure values P1,soll or P2,soll with the calculated contact-pressure minimum value in a manner such that if P1,soll≦P1,min, the controlled variable changes from the primary to the secondary side and if the condition P2,soll≦P2,min is fulfilled, the secondary side changes to the primary side, the primary side being the controlled variable at the start of the method.

Abstract: A method and system are provided for controlling a fuel cell power plant (10). A demand signal (Mld) representing the anticipated current/power required by the electrical load(s) is provided. A current signal (Iap) representative of the actual current drawn by the load(s) (20) is provided. The greater of the demand signal (Mld) and the current signal (Iap) is selected (46) and utilized to provide a control signal (Mx, Mx′, Mx″) for regulating one or more of the reactants and coolant (24). One or more status signals (Xp, Xp′, Xp″, Vap) indicative of the status of a regulated one of more of the reactant/coolant and/or a respective operating process effected, is provided. Each status signal is transformed to a respective load capability signal (61, 61′, 61″). The lesser of the demand signal (Mld) and each of the load capability signals (61, 61′, 61 ″) is selected (62) to provide an output signal (Mi) for commensurately controlling a system load (20, 32).

Abstract: A control apparatus of automatic transmission controls by oil pressure at least one clutch of an automatic transmission connected to an engine output to be engaged or disengaged to make gear shifting. In this control apparatus, the output torque of the engine is calculated on the basis of a parameter representative of a load of the engine and the engine speed. In addition, a transfer torque necessary for the clutch is calculated by use of at least the calculated engine output torque and the engine speed. Then, a command value of oil pressure acted on the clutch is determined by the calculated transfer torque.

Abstract: In an automatic transmission of a motor vehicle, in which a hydraulic pressure is supplied to a piston of a friction element is maintained at a first level that is lower than a given level at which the friction element is engaged, while the vehicle that is in a forward-drive range is being stopped, when the range of the automatic transmission is changed from a neutral range to the forward-drive range the hydraulic pressure having a second level that is higher than the first level is supplied to the piston of the friction element until a completion of the stroke of the piston is detected. The stroke completion of the piston is judged based on a predetermined difference between a turbine speed of the automatic transmission detected upon the change of the range and a current turbine speed.

Abstract: A control apparatus for a vehicle includes a power transmitting system between an engine and wheels. The transmitting system has a continuously variable transmission (CVT) and a motor-generator actuated in one of a regenerating operation mode and an assisting operation mode. The motor-generator serves as a generator in a regenerating operation mode and as a motor in an assisting operation mode. The apparatus includes an electric control unit (ECU) that determines a shift of engine speed, computes the total amount of torque of the engine, the CVT and the motor-generator and selects one of the operation modes and actuates the motor-generator base on the selected operation mode to corrects the engine speed.