104 results about "Pitch rate" patented technology

A vehicle attitude controller capable of improving turning operability, steering stability, and ride quality of a vehicle. In a normal-operation region, a pitch control unit for calculating a target pitch rate in accordance with a roll rate performs control in priority to a roll suppression section. In this case, a target damping force calculated in the pitch control unit is weighed to control a damping-force characteristic of the dampers so that a pitch rate becomes equal to the target pitch rate. In a critical region in which a road-surface gripping state of the vehicle tires is bad, the roll suppression section performs control in priority to the pitch control unit so as to weigh a target damping force calculated in the roll suppression section. As a result, the damping-force characteristic of the dampers is controlled so as to increase the amount of roll suppression control.

A vehicle stability control system comprises a 5-sensor cluster and a stability controller configured to communicate with the 5-sensor cluster and receive signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate from the 5-sensor cluster. The stability controller can also be configured to determine a braking amount or a throttle amount to maintain vehicle stability. The system also comprises a brake controller configured to communicate with the stability controller and receive a braking request from the stability controller, and a throttle controller configured to communicate with the stability controller and receive a throttle request from the stability controller. The system may also comprise a braking or throttling command computed based on various scenarios detected by measured and calculated signals.

A digital still camera includes a lens system having a variable focal length. An image pickup unit is disposed on an optical axis of the lens system, for forming an image frame. Yaw and pitch rate sensors detect a camera shake to output shake information. A shake correction mechanism, associated with an anti-vibration lens, compensates for the camera shake by shifting perpendicularly to the optical axis according to the shake information. A memory stores an LUT of correlation information between the focal length and a shift amount of the shake correction mechanism to compensate for an image shake of the image frame created due to a change in the focal length. In case of lack of detected camera shake with the yaw and pitch rate sensors, the shake correction mechanism is controlled with a shift amount associated with the focal length according to the LUT.

The present invention provides a vehicle body attitude control apparatus capable of improvement of cornering operability, steering stability, and a ride comfort while a vehicle is running. A controller includes a gain, a determination unit, a multiplication unit, an FF control unit, a difference calculation unit, an FB control unit, an average value calculation unit, a target damping force calculation unit, and a damper instruction value calculation unit so as to enable such control that a pitch rate and a roll rate are set into a proportional relationship while the vehicle is cornering. The controller calculates a target pitch rate proportional to the roll rate, variably controls a damping force characteristic of a damping force variable damper disposed at each of front left, front right, rear left, and rear right wheels so as to achieve the target pitch rate, and generates a pitch moment to be applied to the vehicle body accordingly.

The present invention provides a suspension control apparatus requiring a reduced number of sensors. A pitch rate estimating unit 21 calculates a pitch rate used for creating a control instruction value, with use of a wheel-speed time-rate-of change obtained based on wheel speeds vc_FL and vc_FR detected by wheel speed sensors 7FL and 7FR, and an estimated forward/backward acceleration a_es calculated by a forward/backward acceleration estimating unit 20.

A control system (18) and method for an automotive vehicle (10) includes a pitch rate sensor (37) generating a pitch rate signal, a longitudinal acceleration sensor (36) generating a longitudinal acceleration signal, and a yaw rate sensor (28) generating a yaw rate signal. A safety system (44) and the sensors are coupled to a controller. From the sensors, the controller (26) determines an added mass and a position of the added mass, a pitch gradient and/or a pitch acceleration coefficient that takes into account the added mass and position. The controller controls a vehicle system in response to the added mass and the position of the added mass, the pitch gradient and/or pitch acceleration coefficient variables.

A method for reducing at least one of loads, deflections of rotor blades, or peak rotational speed of a wind turbine includes storing recent historical pitch related data, wind related data, or both. The stored recent historical data is analyzed to determine at least one of whether rapid pitching is occurring or whether wind speed decreases are occurring. A minimum pitch, a pitch rate limit, or both are imposed on pitch angle controls of the rotor blades conditioned upon results of the analysis.

A longitudinal G sensor 51 and a roll rate sensor 54 are mounted onto a back surface 61b of a substrate 61 in parallel with an X-axis and a lateral G sensor 52 and a pitch rate sensor 55 are mounted thereon in parallel with a Y-axis, the longitudinal G sensor 51 and the lateral G sensor 52 are positioned thereon in close vicinity to each other, and the roll rate sensor 54 and the pitch rate sensor 55 are positioned thereon in close vicinity to each other, while a vertical G sensor 53 and a yaw rate sensor 56 are mounted onto a surface 61a of the substrate 61 in orthogonal to a Z-axis and also the vertical G sensor 53 and the yaw rate sensor 56 are mounted thereon in close vicinity to each other.

A controller uses a Kalman filter to develop an estimated position of an implement based on a previous implement position, an implement pitch, an implement pitch rate and an estimated implement linkage velocity. The controller moves the implement to a desired position based on the estimated position of the implement.

A system and a method for detecting a hard landing or other high load event of an aircraft and then automatically triggering a report of such hard landing event. A sink rate algorithm is used to estimate the altitude rate of a main gear. The sink rate algorithm uses a plurality of flight parameters to estimate the main gear altitude rate, preferably including at least the following: pitch altitude, radio altitude, vertical acceleration, body pitch rate and vertical speed. This invention has the potential to reduce the number of unnecessary structural inspections, and may also limit the scope of any such required inspections.

A straddled vehicle includes a front wheel, a rear wheel, an engine which generates a driving force and rotates the rear wheel with the driving force, a front wheel brake and a rear wheel brake which lowers the rotation speed of at least the rear wheel, a first detector which acquires and outputs a pitch rate, a second detector which detects and outputs information concerning rotation of the front wheel, and an ECU including a front wheel lift determination circuit which monitors respective outputs from the first detector and the second detector to determine whether a front wheel lift exists based on at least one of the pitch rate and information concerning rotation of the front wheel. When the front wheel lift exists, the ECU controls the driving source or the braking device so that the driving force is lowered or the rotation speed of the rear wheel is lowered.

The invention provides a method and a system for lowering the offshore wind generating set load. The method comprises the following steps of: measuring a wind speed value; according to the wind speed value, determining a revolving speed set value; measuring the revolving speed value of a generator; according to the revolving speed set value and the revolving speed value of the generator, determining a revolving speed deviation; and according to the revolving speed deviation, determining a first variable pitch rate set value so as to bring convenience for a variable pitch execution system to reduce the variable pitch angle of a wind wheel to ensure that the revolving speed of the wind wheel of which the variable pitch angle is reduced is stabilized at a rate value determined by the first variable pitch rate set value. According to the invention, the load of an offshore wind generating set under the non-generating state can be lowered, and the service life of the offshore wind generating set is prolonged.

The invention relates to a regulation control method and device for a large wind turbine generator system and belongs to the technical field of wind turbine generators. According to the method, a rotor acceleration value is collected in real time, when the rotor acceleration value is greater than a set rotor acceleration limit, the rotor acceleration value multiplied by a specific gain factor is taken as a target variable-pitch rate; otherwise a real-time generator speed is collected, when the generator speed is greater than a set generator speed threshold, the gain of a variable-pitch PID (Proportion Integral Derivative) controller is corrected according to the pitch angle of the wind turbine generator system and the ratio of the difference between the generator speed and the set generator speed threshold to the set generator speed threshold, and the variable-pitch rates of blades are controlled by the corrected variable-pitch PID controller. Through the method and the device, a quick and timely response of a variable-pitch system to an extreme gust is guaranteed to reduce the load on blade roots and guarantee the safety of an entire machine; and meanwhile, in the case of an extreme ascending/descending gust nearby a rated wind speed, the rotor speed is prevented from rapidly increasing, so that the frequency of shutdown caused by overspeed is reduced, and the utilization ratio of a wind turbine generator is improved.

A method for adapting an upper headlight beam boundary of a light cone of at least one headlight of a vehicle. The method includes detecting a time curve of a pitch rate of the vehicle or a value that is dependent on the pitch rate and/or of a roll rate of the vehicle or a value that is dependent on the roll rate. The method also includes ascertaining an envelope curve and/or an amplitude of the time curve and/or an average value of the time curve. The method also includes providing a control signal for adapting the upper headlight beam boundary of the headlight beam.

The invention provides a variable-speed variable-pitch wind turbine generator unit gust control method. The method comprises the following steps of (A) detecting whether the rotation speed omega of a wind turbine generator unit is greater than a rated rotation speed omega <rate> of the wind turbine generator unit or not; (B) calculating whether the acceleration speed delta omega/delta t of the wind turbine generator unit is greater than an acceleration speed set threshold value or not; (C) directly setting the variable-pitch angle to be 90 degrees if the wind turbine generator unit meets both the conditions A and B, conducting open-loop control and increasing the variable-pitch rate to the set threshold value; (D) controlling the torque output to be an original torque value during variable-pitch open-loop control; and (E) after the feathering set time T, switching variable-pitch control to conventional closed-loop control if the wind turbine generator unit does not meet the conditions A and B, and continuing feathering of a variable-pitch system if the wind turbine generator unit meets both the conditions A and B. The variable-speed variable-pitch wind turbine generator unit gust control method provided by the invention is good in stability and high safety performance.

A system and method for detecting a fault in a pitch rate sensor onboard a vehicle. Signals, including a steering wheel angle, a yaw rate, a roll rate, a longitudinal acceleration, a lateral acceleration, and a vehicle speed, are processed in a controller to validate a pitch rate signal. Upon detection of a fault in the pitch rate signal, the system and method will determine a process in which to minimize negative effects of the pitch sensor fault. The system and method will then direct the controller to select a process, such as a direct shutdown, a slow shutdown or replace a signal, in a relevant control system, based on the determination.

A wind turbine having a hub (210) rotably attached to a nacelle (200), at least two blades (1, 2, 3) rotationally attach to the hub (210) to allow a change in blade pitch angle ( 1 , 2 3 ) a blade-pitch system (250) for individually controlling the blade-pitch angle ( 1 , 2 3 ) of each blade, a supervisory control unit for issuing a first pitching command, a rotor position sensor (238) generating a rotor-position signal () indicative of the rotor azimuthally position, a rotor-rotational-rate sensor (236) generating a rotor-rotational-rate signal ( CR ) indicative of the rotor rotational speed, and a tower (100) supporting the nacelle (200), comprising a nautical-pitch-rate sensor (230) generating a nautical-pitch-rate signal ( ) indicative of the nautical-pitch-rate of the wind turbine and a computational unit (240, 241) receiving turbine-state signals comprising the rotor-position signal (), the rotor-rotational-rate signal ( CR ), and the nautical-pitch-rate signal ( ).

The present invention provides a suspension control apparatus requiring a reduced number of sensors. A pitch rate estimating unit 21 calculates a pitch rate used for creating a control instruction value, with use of a wheel-speed time-rate-of change obtained based on wheel speeds vc FL and vc FR detected by wheel speed sensors 7FL and 7FR, and an estimated forward/backward acceleration a es calculated by a forward/backward acceleration estimating unit 20.