Rotational speed

About: Rotational speed is a research topic. Over the lifetime, 23327 publications have been published within this topic receiving 151696 citations. The topic is also known as: speed of revolution & revolution rate.

Method for increasing energy capture in a wind turbine

Abstract: A method for operating a wind turbine. The method includes providing a wind turbine having a variable speed control system, the control system having an initial rotational speed set point. At least two operational parameters are obtained from one or more sensors. An adjusted rotational speed set point greater than the initial rotational speed set point is determined in response to the operational parameter. The control system is configured with the adjusted rotational speed set point. A wind turbine and wind turbine plant are also disclosed.

Hybrid vehicle control apparatus

Abstract: A hybrid vehicle control apparatus includes an engine, a motor, first and second engaging elements, an input rotational speed and a controller. The first engaging element is arranged between the engine and the motor to selectively connect and disconnect the engine and the motor. The second engaging element is arranged between the motor and a drive wheel to selectively connect and disconnect the motor and the drive wheel. The input rotational speed detecting section is configured to detect an input rotational speed of the second engaging element corresponding to a rotational speed of the motor. The controller is configured to determine whether the second engaging element is seized based on the input rotational speed when a disengagement command or a slip engagement command has been issued to the second engaging element and a drive force of at least one of the engine and the motor has been changed.

Control device of power transmission device for vehicle

Abstract: PROBLEM TO BE SOLVED: To provide, in a power transmission device equipped with a differential mechanism, first and second electric motors and an automatic transmission section (a mechanical power transmission section), a control device preventing the second electric motor from rotating at a high speed when power transmission is interrupted at the automatic transmission section during traveling by an engine and a traveling load on the engine is suddenly reduced. SOLUTION: A rotation state determination means 92 determines whether or not the second electric motor M2 is in a high-speed rotation state in which it rotates at a high speed exceeding a high-speed rotation determination value LMT1 or in a high-speed rotation predictable state in which it is predicted to reach high-speed rotation exceeding the high-speed rotation determination value LMT1. A rotation inhibition means 94 performs engine rotation inhibition control for inhibiting engine rotation speed N E to an engine rotation speed limit value LMTE or lower when the second electric motor M2 is in the high-speed rotation state or in the high-speed rotation predictable state. The second electric motor M2 is thus prevented from rotating at a high speed by an engine rotation speed rise. COPYRIGHT: (C)2009,JPO&INPIT

Power output apparatus, drive system, and control method of power output apparatus

Abstract: The technique of the invention is applied to a motor vehicle where an engine and a first motor are linked to a driveshaft via a planetary gear mechanism, a second motor is linked to the driveshaft via a transmission, and a battery is arranged to receive and transmit electric power from and to the first motor and the second motor. In response to a deviation of the charge-discharge state of the battery from an allowable control range set as an allowable charge state range of the battery during an upshift, gear change control of the invention sets a gearshift condition change flag F1 to 1 (step S360) and sets a value N2 having a smaller absolute value than a value N1 to a target rotation speed change ΔNm2* of the second motor (step S380). The gear change control then sets a hydraulic pressure command Pb1* of a brake B1 included in the transmission to make an actual rotation speed change Nm2 of the second motor approach to the target rotation speed change ΔNm2* (step S400). This arrangement reduces a rate of change in rotation speed ΔNm2 of the second motor. The reduced rate of change in rotation speed Nm2 prevents a continuous decrease or a continuous increase in power consumption of the second motor that is caused by, for example, delayed detection, delayed computation, and delayed communication, thus effectively protecting the battery from excessive power input and excessive power output.