3232 results about "Motor torque" patented technology

A method for providing an active engine stop of the engine of a hybrid electric vehicle. The method utilizes the electric machine to oppose the and rapidly stop the rotation of the engine at a controlled rate. The method includes the calculation of an input speed reduction trajectory using the engine speed when the active engine stop request is made and a predetermined speed reduction interval. The predetermined speed reduction interval is preferably less than a time from the active stop request to the shutoff command to the electric machine. The method provides rapid deceleration of the engine, particularly through the powertrain resonance speed, thereby reducing the amount of vibration energy dissipated through the powertrain and vehicle chassis. The method also removes the electric machine torques from the engine prior to achieving zero engine speed in order to avoid imparting a negative engine speed or counter-rotation of the engine. The method preferably comprises a complementary series of software control functions that allow the vehicle to actively stop the engine.

A method of testing an electric motor that is adapted to provide a desired electric motor output torque to a vehicle powertrain system comprising an engine and the electric motor which are operatively and selectively coupled to a transmission. The method includes the steps of determining an initial motor speed of the electric motor, determining a motor torque command as a function of the initial motor speed, applying the motor torque command to the electric motor to produce an output torque from the electric motor, measuring a resultant motor speed of the electric motor and establishing a motor status as a function of the resultant motor speed. The method may be implemented as a computer control and diagnostic algorithm.

A condition of impaired speed and torque control of a parallel electrically variable transmission due to factors beyond nominal modeling and estimation errors is diagnosed under low speed operation. The transmission includes at least one electric machine and a motor torque controller for regulating the transmission input speed and output torque. The motor torque controller includes an open-loop control path based on predetermined torques and accelerations and a closed loop control path based on input speed error. The presence of a larger than expected closed-loop correction magnitude, combined with low output speed and one or more other conditions is used to diagnose a condition of potential torque error, in which case the transmission control is altered to prevent unwanted operation.

The present invention includes, among other embodiments, a system embedded in a vehicle including several inputs. The inputs may include one hard coded data, data from sensors on the vehicle, data from external sensors, user coded data, data received from remote databases, data received from broadcast data steams or data that has been accumulated during use of the vehicle. The inputs provide information regarding vehicle speed, motor rpm, motor torque, battery voltage, battery current, and battery charge level, etc. The embedded system also includes a processor unit that receives information from the plurality of inputs and calculates at least an expected vehicle range. The results of any calculations completed by the processing unit is supplied as an output to a display unit, which then displays the information to the user.

Requested brake torque and requested throttle torque are assigned opposite algebraic signs in both rollback and non-rollback states. In the non-rollback state, requested motor torque development includes a process step (206) in which requested brake torque and requested throttle torque are algebraically summed. In the rollback state, requested motor torque development includes a process step (218) in which requested throttle torque is substituted for the regeneration torque limit. In the rollback state, the difference between the requested throttle torque and the requested brake torque is compared with a zero vehicle speed regeneration torque limit (228) when the result of comparing the difference between requested throttle torque and the requested brake torque with the regeneration torque limit (222) discloses that the latter difference does not exceed the regeneration torque limit. The result is used to determine respective amounts of motor torque and friction brake torque (230, 232, 234, 236).

The present invention is directed to a direct-drive fan system and a variable process control system for efficiently managing the operation of fans in a cooling system such a as wet-cooling tower or air-cooled heat exchanger (ACHE), HVAC systems, mechanical towers or chiller systems. The present invention is based on the integration of key features and characteristics such as tower thermal performance, fan speed and airflow, motor torque, fan pitch, fan speed, fan aerodynamic properties, and pump flow. The variable process control system processes feedback signals from multiple locations in order control a high torque, variable speed, permanent magnet motor to drive the fan. Such feedback signals represent certain operating conditions including motor temperature, basin temperature, vibrations, and pump flow rates. Other data processed by the variable process control system in order to control the motor include turbine back pressure set-point, condenser temperature set-point and plant part-load setting. The variable process control system processes this data and the aforesaid feedback signals to optimize the operation of the cooling system in order to prevent disruption of the industrial process and prevent equipment (turbine) failure or trip. The variable process control system alerts the operators for the need to conduct maintenance actions to remedy deficient operating conditions such as condenser fouling. The variable process control system increases cooling for cracking crude and also adjusts the motor RPM, and hence the fan RPM, accordingly during plant part-load conditions in order to save energy.

Systems and methods of determining static air pressure in an HVAC system are provided. Static air pressure is mathematically determined as a function of system parameters, such as blower speed, blower diameter, system volume airflow rate, and/or blower motor torque. The determined static pressure can be used during HVAC installation and during HVAC monitoring and maintenance.

An independent wheel torque control algorithm is disclosed for controlling motor torques applied to individual electric motors coupled to vehicle wheels in an electric vehicle. In a first range of vehicle states, vehicle steerability is favored so that the operator of the vehicle suffers little or no longitudinal propulsion loss while steering is enhanced. In a second range of vehicle states, vehicle stability is favored. According to embodiments of the disclosure, a desired yaw moment is computed and then may be reduced in magnitude due to system limitations, electrical or friction limits, which prevents the desired yaw moment from being fully realized.

In a control apparatus for a hybrid vehicle which is able to travel under the driving force from at least one of an internal-combustion engine E and a drive motor connected to the internal-combustion engine, when an FI/AT/MGECU and a MOTECU execute motor damping which generates a torque for suppressing the torque vibration of the internal-combustion engine, in the motor M, the MOTECU corrects a motor torque calculating battery terminal current value obtained by multiplying an input-output current ABAT of the battery, by an offset value corresponding to the motor damping, and executes zero power control based on the corrected motor torque calculating battery current value. As a result, the input and output power of the power storage unit are accurately balanced and overcharge or overdischarge of the battery based on the input-output current ABAT of the battery including errors due to the damping control or the motor torque calculating battery current value, is avoided.

The present invention provides a slip rate estimating device measuring a slip ratio without the need for a body speed and a slip ratio control device using the slip ratio estimating device. A motor torque measured by a torque measuring instrument is input to each of a vehicle model (601) and an SRE (602) that performs calculations including time differentiation of the slip ratio. The vehicle model (601) derives a wheel rotation speed, a wheel rotation acceleration, and a body speed. The vehicle model (601) outputs the wheel rotation speed and the wheel rotation acceleration to the SRE (602). The SRE (602) outputs the slip ratio based on the motor torque, the wheel rotation speed, and the wheel rotation acceleration.

The invention discloses a torque distribution control method for an electric-wheel automobile hub motor torque distribution system, and belongs to the field of an electric-wheel automobile. The electric-wheel automobile hub motor torque distribution system comprises parts as follows: a driver intention module, a hub motor, a stability controller, a torque distributor, a slip rate controller, a whole automobile module, a pavement information module and a whole automobile sensor module, wherein the stability controller comprises a fine adjustment mode and a stable adjustment mode, and the torque distributor divides whole automobile movement into a dynamic mode, an economical mode and a stable mode. According to the torque distribution control method, a plurality of controlled variables such as the slip rate, attachment coefficient, yaw velocity, side slip angle, hub motor rotating speed and the like are combined to control the automobile, so that stability and dynamic performance of the automobile at the low speed or high speed are guaranteed; and the automobile torque is distributed, so that automobile drive capacity, motor utilization efficiency and whole automobile stability when the automobile is driven normally or has a slipping phenomenon are improved.

In a coaxial two-wheeled vehicle, an attitude controller (84) calculates motor torque Tgyr for maintaining a base so that it has a target angle from deviation between base angle command θref serving as attitude command and current base angle θ₀ calculated by using a gyro sensor (13) and an acceleration sensor (14). On the other hand, at a position proportional controller (86R), a differentiator (88R) and a velocity proportional controller (89R), there is performed PD control with respect to deviation between rotation position command Prefr of a motor rotor (92R) for right wheel and current rotation position θr of a motor rotor (92R). A current control amplifier (91R) generates motor current on the basis of added value of motor torque which is the control result and estimated load torque T₁ calculated by using pressure sensors to drive the motor rotor (92R).

The invention enables a novel single-motor and double-clutch type hybrid electric vehicle to be a study object and provides a control method of the process of utilizing a motor to start an engine during vehicle running. First a structure and a working mode of the hybrid electric vehicle are analyzed, a system dynamics model is established, a working range of the hybrid electric vehicle is divided, corresponding torque management strategies are formulated; then in the practical application process, whether the conditions for utilizing the motor to start the engine are achieved is judged by calculating demand torque, value of state of charge (SOC) of a battery, a rotating speed of the motor; and when the conditions for utilizing the motor to start the engine are achieved, model switch is performed, a moment-limiting clutch jointing instruction is sent out, and the processing of utilizing the motor to start the engine is achieved by controlling oil pressure of a moment-limiting clutch hydraulic cylinder and utilizing the formulated torque coordination-control strategies to perform coordination control of motor torque, engine torque and transmission torque of a moment-limiting clutch. By utilizing the advantage that the motor responds fast and timely increasing or reducing the motor torque according to the control strategies, the control method provides the demand torque for starting the engine during the vehicle running or compensates the insufficiency of the engine torque, reduces impact degree in the switching process and improves ride comfort of the hybrid electric vehicle.

A torque control strategy control for management of regenerative braking in a motor vehicle. A first processor (12) processes throttle request data (20) and torque modification data (40) from a second processor (14) to develop motor torque request data (28) for controlling rotary electric machine torque. The second processor processes brake request data (26), the throttle request data, and operating data from the at least one operating data source to develop friction brake torque data (30) for controlling friction brake torque applied to the vehicle and the torque modification data for the first processor. The two processors interact such that as long as the operating data from the at least one operating data source does not require that regenerative braking torque be limited, the torque modification data supplied to the first processor from the second processor equates to the brake torque request data, and the friction brake torque data does not cause the friction brakes to be applied, and when the operating data from the at least one operating data source calls for some limiting of the regenerative braking torque, the amount of limiting is subtracted from the torque modification data and the friction brake torque data equates to that amount of limiting for causing the friction brakes to be applied in that amount.

A permanent magnet synchronous machine with improved torque and power characteristics. A circumferential-oriented rotor assembly is provided with alternating permanent magnets and magnetic pole pieces. In order to reduce the amount of leakage flux in the rotor and increase the effective length of the permanent magnet, a trapezoidal or otherwise tapered permanent magnet structure is used. By alternating trapezoidal permanent magnet, and magnetic pole pieces, a higher intensity magnetic field is created in the air gap utilizing the same radial space in the motor without altering the weight or volume of the motor compared to conventional machines.

A controllable motor includes a rotor. A first stator winding set is operable, upon being energized, to generate and apply a first torque to the rotor. A second stator winding set independent of the first stator winding set is operable, upon being energized, to generate and apply a second torque to the rotor. A motor control is coupled to the first and second stator winding sets. The motor control is operable to selectively energize one of the first or second stator winding sets to thereby generate and apply one of the first or second torques to the rotor, and simultaneously energize both the first and second stator winding sets to thereby generate and apply a third torque greater than the first or the second torque.

The invention discloses a hierarchical system used for a four-wheel-hub motor-driven electric automobile, and a control method. First of all, yaw moment is calculated as a yaw moment decision-making layer according to a vehicle speed sensor, a steering wheel rotary angle transmitter, an electronic throttle sensor and an inertia measurement unit; then according to automobile longitudinal force constraints, yaw moment constraints, a maximum adhesion force which can be provided by a pavement and restrictions of motor maximum output moment, target torque of each wheel hub motor is calculated as a target optimization analysis layer; and finally, degrees of similarity to six standard pavements are obtained by inputting two parameters, i.e., an adhesion coefficient and a wheel slip rate into a pavement adhesion coefficient estimation fuzzy controller by means of a current pavement, and an adhesion coefficient estimated value of the current pavement is obtained as a pavement adhesion coefficient monitoring layer after weighted averaging is performed. According to the invention, whole-vehicle stability is taken as a control target, motor torque is reasonably distributed according to operation working conditions, and the controllability, the stability and the economic property of vehicles are improved.