摘要:
Provided herein is a control system for a multiple-mode continuously variable transmission having a ball planetary variator. The control system has a transmission control module configured to receive a plurality of electronic input signals, and to determine a mode of operation from a plurality of control ranges based at least in part on the plurality of electronic input signals. The transmission control module includes a CVP control module. The CVP control module is adapted to implement a cylinder deactivation control process. The cylinder deactivation control process is configured to generate and select a commanded CVP speed ratio and a commanded engine torque based on a desired NVH standard and minimum BSFC.
摘要:
Methods are provided for managing forcing function frequency profiles during operation of a multi-cylinder engine. A first stroke mode for a first cylinder is selected and comprises at least a sequential deactive operation of the opening and the closing of a first intake valve and a first exhaust valve during at least two reciprocations of a first reciprocating piston. The first stroke mode is operated on the first cylinder, a second stroke mode is operated on a second cylinder, and a third stroke mode is operated on the remaining cylinders to meet or exceed a required torque output and to form a first aggregate of forcing function frequency profiles that comprises primary forcing function frequency profiles that are less than or approximate in amplitude and less than or approximate in frequency value to one of the respective baseline of primary forcing function frequency profiles.
摘要:
A variety of methods and arrangements are described for controlling transitions between firing fractions during operation of an engine. In general, actuator first transition strategies are described in which an actuator position (e.g., cam phase, TCC slip, etc.) is changed to, or close to a target position before a corresponding firing fraction change is implemented. When the actuator change associated with a desired firing fraction change is relatively large, the firing fraction change is divided into a series of two or more firing fraction change steps. A number of intermediate target selection schemes are described as well. The described techniques are well suited for use in managing firing fraction transitions during skip fire, dynamic firing level modulation and/or other types of engine operation where the effective displacement of the engine may change.
摘要:
Various methods and arrangements for improving fuel economy in decel fuel cut-off (DFCO) operation of an internal combustion engine are described. In one aspect, a catalytic converter bypass valve diverts the pumped air in DFCO mode from flowing through a catalytic converter. The diverted, pumped air may flow through a bypass line or be returned to the engine intake manifold through an exhaust gas recirculation return line. Another aspect of the invention relates to directing the diverted pumped air through an emission control device.
摘要:
Air to fuel ratio management comprises sensing a power output request for the engine and determining a fuel-efficient air to fuel ratio. A current air to fuel ratio is sensed in one or both of an intake manifold and an exhaust manifold connected to the engine. An air to fuel ratio adjustment is determined based on the fuel-efficient air to fuel ratio and based on the current air to fuel ratio. An in-cylinder exhaust gas recirculation technique is selected. The in-cylinder exhaust gas recirculation technique adjusts an oxygen and particulate content of exhaust gas resulting from combustion. A number of cylinders of the multiple-cylinder engine are selected to implement the in-cylinder exhaust gas recirculation technique. The intake valves and the exhaust valves are controlled to adjust the oxygen and particulate content of the exhaust gas by applying a second compression stroke of the respective reciprocating pistons to the exhaust gas.
摘要:
A method for exhaust temperature management in a multiple-cylinder, reciprocating-piston engine, comprising sensing a low temperature condition of the exhaust and implementing an increased heat output engine cycle pattern for the engine based on the sensed low temperature condition. The increased heat output engine cycle pattern comprises deactivating fuel injection to a first cylinder of the engine, the first cylinder comprising a piston reciprocating between top-dead-center and bottom-dead-center. Also, activating engine braking mode on the first cylinder by opening one or more valves when the piston is away from bottom-dead-center during a compression stroke. A second cylinder of the engine is fired in a combustion mode while the first cylinder is in engine braking mode.
摘要:
A method for engine-braking a multiple-cylinder diesel engine can comprise selectively firing cylinders of the multiple-cylinder diesel engine in a combustion mode and selectively engine-braking a cylinder of the multiple-cylinder diesel engine. Engine-braking can comprise terminating fuel injection to the cylinder and opening one or more valves affiliated with the cylinder after a respective piston of the cylinder has completed a compression stroke. Modulating the timing of the engine braking balances engine vibrations.
摘要:
Die Erfindung betrifft eine Mehrzylinder-Brennkraftmaschine (1) mit zumindest einem ersten Zylinder (2) oder einer Gruppe von ersten Zylindern (2) und zumindest einem zweiten Zylinder (3) oder einer Gruppe von zweiten Zylindern (3), wobei der zumindest eine erste Zylinder (2) bzw. die Gruppe von ersten Zylindern (2) mittels zumindest einer Zylinderabschalteinrichtung (4) deaktivierbar ist, und wobei ein Verdichtungsverhältnis zumindest eines Zylinders mittels zumindest einer Verdichtungsänderungseinrichtung (5) veränderbar ist. Um einen wirkungsgradoptimalen Betrieb der Brennkraftmaschine auf möglichst einfache Weise zu ermöglichen, ist vorgesehen, dass das Verdichtungsverhältnis des bzw. der ersten Zylinder (2) unveränderbar und das Verdichtungsverhältnis des bzw. der zweiten Zylinder (3) veränderbar ist.
摘要:
The method for operating a multi-cylinder piston engine (1) comprises the steps of operating a first group of cylinders (2) in an active state, in which state a first amount of a main fuel is injected into each cylinder (2) during each cycle of the engine (1), simultaneously operating a second group of cylinders (2) in a deactivated state, in which state at least the injection of the main fuel into the cylinders (2) is deactivated, and activating the fuel injection of the main fuel into the cylinders (2) of the second group. When the fuel injection of the main fuel into the cylinders (2) of the second group is activated, during the first cycle of the engine (1) a second amount of the main fuel is injected into each cylinder (2) of the second group, the second amount being greater than the first amount.