318results about How to "Reduce output torque" patented technology

In a powertrain for motor vehicle that includes an engine, a first electric machine and a second electric machine, each machine being able to function alternately as a motor and a generator, a transmission having an input driveably connected to the engine and the first electric machine and a transmission output driveably connected to the second electric machine and wheels of the vehicle, a method for controlling the powertrain includes using the engine to produce wheel torque, performing a gear shift using the transmission, if a reduction in powertrain output torque is to occur while modulating torque during the gear shift, operating one of the first electric machine and the second machine as an electric generator to reduce the powertrain output torque, and if an increase in powertrain output torque is to occur while modulating torque during the gear shift, operating one of the first electric machine and the second machine as an electric motor to increase the powertrain output torque.

A control device for a vehicle drive apparatus that includes a differential mechanism and an electric motor provided in the differential mechanism, which can be miniaturized in structure with improved fuel economy and enabling suppression of occurrence in switching shocks. With a provision of a switching clutch or a switching brake, a shifting mechanism is placed in either a continuously variable shifting state or a step variable shifting state. During a shifting of an automatic shifting portion, an engaging control variable control alters a method of learning an engaging pressure. This allows a rotation speed of a transmitting member to achieve a given variation during the shifting, depending on a continuously variable shifting state and a non-continuously variable shifting state, for thereby providing a balance between an improvement in a feeling and a suppressing of shifting shocks.

Methods and systems are provided for adjusting an engine output delivered in response to an operator pedal actuation based at least on a grade of vehicle travel. During uphill travel, in the presence of headwinds, and/or in the presence of a vehicle payload, the output may be increased while during downhill travel or in the presence of tailwinds, the output may be decreased. In this way, driver fatigue during travel over varying elevations, varying ambient conditions, and varying loads can be reduced.

A control apparatus of a vehicular power outputting apparatus, which temporarily increases the rotation speed of an input rotating element provided in an automatic transmission using an engine during a downshift in the automatic transmission, is provided with cylinder reduction controlling means for performing a cylinder reduction control that stops at least some of a plurality of cylinders provided in the engine from generating power during a downshift of the automatic transmission. As a result, pumping loss of the engine is reduced which enables the speed of the engine to be increased faster, thus improving shift response.

The invention discloses a temperature compensation method of an output torque of a permanent magnet synchronous motor for a vehicle based on a neural network. The method aims at the influence of temperature on stator resistance and a permanent magnetic flux linkage and comprises the following steps: building a neural network model for describing non-linear coupling action of the temperature on multiple parameters of a vehicle-mounted permanent magnet synchronous motor; and based on the built neural network model, designing a temperature compensator on the output torque, so that the motor can be effectively and continuously controlled and an ideal and smooth output torque is obtained. The method disclosed by the invention has the advantages that a temperature compensation control system is adopted, the controller regulates the control quantity according to different motor temperatures, and then real-time control is carried out on the motor, so that the smooth output torque is obtained, and the operation difficulty of a technician is lowered; and the voltage control quantity does not need to be adjusted according to an efficiency map in real time and can be adjusted in real time according to the continuous change of the temperature, so that the control precision is greatly improved.

A double-stator synchronous motor has a rotor, an inner stator and an outer stator. The rotor has segment-magnetic poles arranged in a ring shape. Magnetic poles formed in the inner stator and the outer stator face to each other in a same circumferential position. Each stator has q (q≧2) slots per pole and phase to disperse magnetomodive force. A radially minimum width Wr of each segment magnetic pole is within a range of 1.3q to 2.3q times of a minimum width Wt of outer teeth. A magnetic depth of a magnetic concave section formed in the segment magnetic pole is within a range of not less than an average width Ws of the inner slots. Because this suppresses demagnetization in the permanent magnets caused by stator magnetomotive force, ferrite magnets are used as buried magnets and magnetic-pole central magnets, and suppress the amount of neodymium magnet used in the rotor.

A driver-initiated low traction control method limits the drive torque of a motor vehicle during operation on low traction road surfaces. The low traction control mode is initiated by actuation of a switch or by moving a transmission range selector to a Low range while the vehicle is substantially stopped, and terminated by further actuation of the switch or by returning the range selector back to the Drive setting. The low traction control mode limits the engine torque as required to limit the drive wheel torque and its rate of change, so long as cruise control is inactive, the accelerator pedal setting is less than a reference level, and the transmission is operating in a gear other than its top gear. When the low traction control mode is terminated, the engine torque limits are progressively removed in a way that does not produce perceptible acceleration or deceleration of the vehicle.

A method controlling a hybrid electric vehicle. The hybrid electric vehicle includes a power transfer unit having a plurality of gear ratios and at least one power source adapted to drive the power transfer unit. The method includes calculating a speed ratio value, comparing the speed ratio value to a threshold value, and inferring a torque disturbance if the speed ratio value is greater than the threshold value.

The invention discloses parallel-connected torque control system and method for hydraulic hybrid power vehicles, belonging to the torque control systems and methods for multi-energy vehicle powertrains. The system comprises a management layer, a control layer and an execution layer. A management layer module is used for confirming the expected driving torque of a whole vehicle under the current situation by combining with the vehicle speed under the current state according the operation behaviors of a driver to an accelerator pedal. A control layer module is used for judging the operation mode of a hybrid power system according to the information acquired by a plurality of sensors and reasonably distributing the output torques of an engine and a hydraulic hybrid power system. An executionlayer module is used for independently controlling respective controlled objects according a control command of the control layer and feeding back the state variable of each part to the control layer. The invention has the advantages of reasonably distributing the output torques of the engine and a hydraulic pump motor, ensuring that the output torque of the engine is relatively concentrated on an optimal economical zone, and avoiding adverse influences of the frequent starting and stopping of the engine and the hydraulic pump motor to elements.

The invention provides a vehicle speed control method used for an electric vehicle. The method specifically includes the steps that the target vehicle speed is obtained; the current vehicle speed of the vehicle is obtained; the early warning vehicle speed smaller than the target vehicle speed is set according to the target vehicle speed; and a response is made when the current vehicle speed exceeds the early warning vehicle speed, and the motor output torque of the vehicle is controlled to be reduced, so that the current vehicle speed of the vehicle is stabilized at the target vehicle speed. The invention further provides a vehicle speed control system capable of achieving the provided vehicle speed control method and the electric vehicle. The motor output torque is controlled so that thevehicle speed can be controlled, the vehicle speed is stabilized at an expected value, traveling safety can be guaranteed, and meanwhile the driving and riding experience feeling is not reduced.

The invention discloses a plug-in type planet series-parallel automobile energy management control method and belongs to the technical field of hybrid automobile control. The plug-in type planet series-parallel automobile energy management control method is used for determining a working point of each power source of a vehicle control electric mode and a hybrid drive mode. In the hybrid drive mode, the change of a driver desired torque is responded by controlling a motor desired torque in different battery capacity modes; a working point of an engine is always controlled on an optical workingcurve; when an actual torque of a motor is larger, an engine desired torque is controlled to be increased, so that the motor obtains a torque interval supplementing the driver desired torque; in addition, the control of the working point of the engine also needs to guarantee a control output power of the battery. The plug-in type planet series-parallel automobile energy management control method disclosed by the invention has the advantages that the stable operation of the engine is sufficiently considered, the fuel consumption is reduced, the battery output power control is reduced, and the fuel economy in the full running process is improved; and as the method is a control strategy of a logic threshold value, the operation speed of the method in a controller is high, and the method is easy to implement and popularize.

The present invention discloses a method and apparatus for controlling a motor for an electric vehicle. The method and apparatus calculates the current acceleration a of the motor according to the detected rotor position values in real-time, and if the current acceleration a is greater than a predetermined forward acceleration a0, the output torque of the motor is decreased. If the acceleration a is less than a predetermined backward acceleration a1, then the output torque of the motor is decreased. Thus, when the vehicle travels from a normal road surface to a smooth road surface, the decrease or increase output torque may suppress the abrupt speed variations.

The invention discloses an electric height adjusting device for a seat. The electric height adjusting device comprises a seat height adjusting toothed plate and an electric mechanism driving the seat height adjusting toothed plate to rotate. The electric mechanism comprises a reduction gearbox body, a motor, a worm, a bevel gear component, a flexible bearing, a flexible wheel, a rigid wheel body, a reduction gearbox cover and an output transmission piece. The direct-current motor is used as a power source of the electric mechanism, motor torque is transmitted to the worm and then transmitted to the bevel gear component through the worm, and first-level speed reduction of the electric mechanism is composed of the worm and the bevel gear component. After first-level speed reduction transmission is completed, power is output to the output transmission piece through a harmonic gear mechanism composed of the bevel gear component, the flexible bearing, the flexible wheel to be output. The electric height adjusting device for the seat has the advantages of being small in size, large in output torque, large in transmission ratio, high in transmission precision, small in return stroke clearance, high in bearing capacity and the like, adjustment handleability and the overall strength of the seat are increased, and the noise level is greatly lowered.

An electronic control unit 40 calculates a target output torque of an internal combustion engine 10 based on a manipulation amount of an accelerator pedal 60, a vehicle speed, and a state of a transmission gear ratio of an automatic continuously variable transmission 30, and calculates a target opening of a throttle valve 14 based on the calculated target output torque. If the current value of the transmission gear ratio of the automatic continuously variable transmission 30 is smaller than a predetermined value, the target opening of the throttle valve 14 calculated based on the target output torque is limited to be less than or equal to a preset upper limit.

The invention provides a diesel-alternative fuel hybrid combustion engine control method without an electric oil pump rack actuating mechanism, belonging to the field of engine control. According to the invention, an exhaust temperature sensor, a wide-range oxygen sensor, a mixedly burning ratio information display screen, an alternative fuel injection controller, a high pressure diesel pump rack displacement sensor and an alternative fuel injector are additionally arranged on an original diesel engine with a mechanical high pressure fuel pump; a high pressure diesel pump rack is mechanically connected with a vehicle accelerator pedal; and according to the position of the high pressure oil pump rack of the diesel engine, the alternative fuel injection controller determines the injection quantity of alternative fuel in combination with estimation on the excess air coefficient of an engine and the operation intention of the driver and sends a control command to drive an alternative fuel injection valve to inject corresponding alternative fuel to an engine intake pipe. The method has the beneficial effects of lowering the cost and overcoming the adverse factors caused by the adoption of an electric oil pump rack actuator and can be widely applied to the diesel-alternative fuel hybrid combustion engines.