498 results about "Direct torque control" patented technology

An engine control system and method according to the invention controls torque in an internal combustion engine. Engine parameters are measured and an engine torque is estimated. A desired air per cylinder of the engine is calculated. A desired manifold absolute pressure of a manifold of the engine is calculated based on a function of engine torque. A desired RPM of the engine is calculated based on a measured engine RPM and a reference torque of the engine. A desired area is calculated based on the desired manifold absolute pressure. The desired area is implemented into the controller to control torque output of the engine.

Method and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method comprises, adjusting a brake torque applied to a deactivated rotating engine after an engine restart request, the brake torque applied to slow the engine to at least a predetermined threshold speed without stopping the engine, and engaging a starter to the still rotating engine to increase the engine speed and restart the engine.

A drivetrain of an all-wheel drive motor vehicle provided for selective actuation and control of the torque distribution between first and second drive axle assemblies to match various vehicle operating conditions. The drivetrain comprises a power drive unit including a prime mover, the first drive axle assembly driven by the power drive unit to drive a first set of wheels, the second drive axle assembly driven by the power drive unit to drive a second set of wheels, a first clutch unit provided to disconnect the first drive axle assembly from the power drive unit, and a second clutch unit provided to disconnect the second drive axle assembly from the power drive unit.

Methods and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method includes, during a first condition, engaging an engine starter, without applying a starter current, to the deactivated rotating engine after the engine speed drops below a threshold speed. The method further includes, during a second condition, engaging the starter and adjusting a starter motor switch to apply a starter braking torque to the rotating engine.

Methods and systems are provided for controlling a vehicle system including an engine that is selectively shut-down during engine idle-stop conditions, the vehicle system further including a hydraulically actuated transmission component. One example method comprises, during an idle-stop engine shut-down, adjusting a hydraulic actuation of the transmission component to adjust drag torque on the engine to stop the engine.

The invention relates to a permanent magnet synchronous motor low inverter power consumption direct torque control method and device. The permanent magnet synchronous motor low inverter power consumption direct torque control method adopts predictive control strategies. Compared with the space-vector-modulation-based direct torque control and the common direct torque control, the permanent magnet synchronous motor low inverter power consumption direct torque control method has the advantages of enabling the integral inverter switching frequency to be the lowest, optimally using a power device and reducing the switching loss of the inverter due to the facts that predicted values of the torque and the stator flux linkage are predicated according to an interior model of a controller based on the given reference values of the torque and the stator flux linkage and a most suitable switching position for the inverter is obtained through a minimization objective function which comprises the flux linkage, the torque and the average switching frequency within the forecast time domain and enabling online computing time to be greatly reduced due to the fact that the control law is fed back through an offline computing state, maintaining good dynamic performance and robustness of the common direct torque control and maintaining the flux and the torque to be within a corresponding hysteresis range.

The present invention discloses an electrical control method and a device for a multi-suspension-point crane. The control method comprises the following steps: a. preparation mode: a high and low voltage distribution system, a main driving system and a control system, etc can be detected to check whether fault is existed; b. steel wire rope pre-tensioning mode: each lifting motor adopts torque control and gives out torque given valve, and then a weighing sensor can check whether the steel wire rope is tightened; c. hovering mode: each lifting motor adopts speed control, the controller sets motor torque limiting valve, load hoist can be underwent and centroid position of loaded object can be calculated; d. joint lifting mode: each lifting motor adopts speed control, the torque limiting value of the motor is the same as that in hovering mode, and constantly monitoring and correction can ensure smooth lifting of hanging piece. The electrical control method improves control level of automatic operation and operation efficiency and reduces error of manual operation. The technology can be used for various cranes with the need of synchronous control and has broad application prospect.

Methods and systems are provided for reducing audible clunks and objectionable drive feel in vehicles including start/stop systems. In one example, a vehicle engine is shutdown during vehicle coasting. The vehicle engine is then restarted, while the vehicle is moving with a torque converter clutch disengaged. A transmission clutch pressure is then adjusted during the restart based on a torque converter output speed relative to a torque converter input speed.

The present invention includes an a plurality of first variable speed motors arranged in a first matrix pattern and mounted on a tail boom of the helicopter; one or more fixed pitch blades attached to each of the plurality of first variable speed motors; and wherein a speed of one or more of the plurality of first variable speed motors is varied to provide an anti-torque thrust.

A quick-release system for a quick-release device, in particular for a cycle, such as a bicycle, the device being of the type including an axially extending skewer and an end support element mounted on a first end of the skewer adapted to be supported on a first tightening surface of the cycle. The quick-release system includes a tightening sub-assembly including a support surface and an actuation sub-assembly including a movable actuating mechanism, capable of axial rotation around the skewer and configured to transmit a tightening torque to the tightening sub-assembly when the device is being tightened. The system includes tightening torque limiting mechanism making it possible to limit the torque transmitted by the actuation sub-assembly to the tightening sub-assembly.

Disclosed herein is a method as well as a system for controlling an electric power steering system. The method includes: receiving a torque signal from a torque sensor responsive to a torque applied to a steering wheel; obtaining a motor velocity signal, the motor velocity signal indicative of a speed of an electric motor which applies torque to a steerable wheel; and generating a command for said electric motor with a controller coupled to the torque sensor, and the electric motor. The command includes torque control and motor velocity compensation, responsive to at least one of the torque signal, and a motor velocity signal. Also disclosed herein is a storage medium encoded with a computer program code for controlling an electric power steering system, the storage medium includes instructions for causing controller to implement the disclosed method. Further disclosed is a computer data signal for controlling an electric power steering system, the data signal comprising code configured to cause a controller to implement the disclosed method. Additionally, a method for optimizing controlling torque in an electric power steering system is disclosed. The method including: receiving a torque signal responsive to a torque applied to a steering wheel; obtaining a motor velocity; generating a command with a controller for the electric motor, where the command includes a torque control and motor velocity compensation, responsive to the torque signal, and the motor velocity. The performance of the torque control is responsive to a torque compensator, a high pass low pass structure, and motor velocity compensation.

The invention provides a model prediction three-level direct torque control method based on state trajectory extrapolation. According to the method, a traditional hysteresis controller with direct torque control is replaced by a model prediction controller. The method includes the following steps: aiming at allowable switching vectors, determining a step-length prediction range for output trajectory extrapolation by using an internal state prediction model, and with average switching frequency of an inverter as a value function, solving an optimal switching vector in real time to act on the inverter directly according to limited time zone rolling optimization strategies of model prediction control. According to the model prediction three-level direct torque control method based on the state trajectory extrapolation, the switching frequency of an NPC three-level inverter can be reduced to about 300Hz, quick dynamic response capability and ideal current harmonic distortion characteristics can be obtained, and the method has broad application prospects in middle-high voltage and high power fields.

The invention relates to an observation method and device for an electromagnetic torque of a salient pole type permanent-magnet brushless direct current motor, and is particularly suitable for the electromagnetic torque and rotation speed control of a motor driving system without position sensors or speed sensors. The observation method and the observation device utilize a rotor counter electromotive force self-adapting stator current observation device, a phase-locked loop based rotor rotation speed and position angle observation device, a rotor counter electromotive force/rotor flux/rotor position angle relation curve, a coordinate conversion device, a stator flux computing device and an electromagnetic torque computing device to observe the electromagnetic torque continuously, instantly and accurately when the position sensors are not available, and observe rotor speed and stator flux in an intermediate variable manner simultaneously, so that the sensorless, high-performance and direct-torque control requirements of the motor are met. The observation method and the device have the advantages of good instantaneity, high observation accuracy, low cost and the like.