Methods and systems are provided for controlling a vehicle engine to deliver desired torque to a power take off device coupled to the engine. In one example, the method may include, learning a filtered PTO torque demand during vehicle acceleration, and steady state operation, and during transition in engine states using the learned PTO torque demand to adjust engine speed in order to deliver a desired engine torque output for optimal operation of the PTO device.

Control systems and methods for a vehicle comprising an automatic transmission utilize a sensor configured to measure an operating parameter of an engine of the vehicle. A controller of the vehicle is configured to detect an imminent shift of the automatic transmission based on the measured operating parameter of the engine. In response to detecting the imminent shift of the automatic transmission, the controller is configured to decrease torque output of the engine by a desired amount by enleaning an air/fuel charge provided to a cylinder of the engine. After decreasing the torque output of the engine by the desired amount, the controller is configured to control the automatic transmission to perform the shift. The decreasing of the engine torque output provides for a smoother shift of the automatic transmission and increased engine fuel economy.

A shift control system which can reduce a shift shock is provided. A target torque determiner set a target torque of an engine based on an accelerator position. An actual torque determiner calculates an actual torque of the engine in the inertia phase. A controller calculates an integrated value of a difference between the target torque and the actual torque from a commencement of the inertia phase to a predetermined time point before a termination of the inertia phase, and corrects the target torque in a remaining period between the predetermined time point and the termination of the inertia phase.

Provided herein is a control system for a multiple-mode continuously variable transmission having a ball planetary variator operably coupled to multiple-mode gearing. 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 control system includes an engine torque limit sub-module adapted to command an engine torque limit based at least in part on the operating conditions of the continuously variable transmission.

A machine may include an engine, a traction device, a continuously variable transmission (CVT) connecting the engine to the traction device, an operator input device outputting engine output command signals input by an operator, an engine speed sensor monitoring an engine output speed, and an electronic control module (ECM). The ECM may control the engine to a target engine speed using engine speed sensor signals as feedback. A desired percentage of peak power of the engine may be determined from the engine output command signals, and the target engine speed may be determined from the desired percentage of the peak power. The ECM determines a CVT transmission ratio that will cause the CVT to apply a load to the engine that will cause the engine to run at the target engine speed.

Methods and systems are provided for controlling a vehicle engine to deliver desired torque to a power take off device coupled to the engine. In one example, the method may include, learning a filtered PTO torque demand during vehicle acceleration, and steady state operation, and during transition in engine states using the learned PTO torque demand to adjust engine speed in order to deliver a desired engine torque output for optimal operation of the PTO device.

Methods and systems for improving vacuum generation for a diesel powered vehicle that includes a mechanically engine driven vacuum pump are presented. In one non-limiting example, engine idle speed may be increased in response to a number of braking events and/or a request for vacuum based on an amount of stored vacuum.

Methods and systems are provided for integrating a bi-fuel engine with a CVT transmission. Responsive to a driver demand, a controller may determine whether to maintain usage of a current fuel or transition to an alternate fuel based on the cost efficiency of the transition and further based on any engine limitations that may be incurred at the engine speed-load following the transition. To improve the net fuel economy benefit while addressing the engine limitation, a fuel transition may be combined with a CVT adjusted engine speed-load regime, while maintaining engine power output.

A method for the operation of a vehicle drive-train of a working machine having a drive motor, a transmission whose transmission ratio can be varied continuously, and a drive output. A rotational speed (nmot) of the drive motor can be varied by the driver, by the driver's actuation of a first control element (50), within a rotational speed range (53) delimited by an upper characteristic line (nmoto) and a lower characteristic line (nmotu). The characteristic lines (nmoto, nmotu) are functions of a reciprocal transmission ratio (irez) of the transmission. Furthermore, the rotational speed (nmot1) of the drive motor that can be set by the driver by way of the first control element (50), can be influenced by the driver's actuation of a second control element (51) and as a function of an operating condition of the working machine.

A system includes a desired turbine power module and an engine actuator module. The desired turbine power module determines a desired amount of power at a turbine of a torque converter based on an accelerator pedal position and a vehicle speed. The torque converter transfers torque from an engine to a driveline and includes an impeller and the turbine. The impeller is connected to a crankshaft of the engine. The turbine is connected to a transmission in the driveline and is at least one of hydraulically coupled and mechanically coupled to the impeller. The engine actuator module controls an actuator of the engine based on the desired turbine power.