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公开(公告)号：US20210207666A1
公开(公告)日：2021-07-08
申请号：US16734971
申请日：2020-01-06
摘要： A controller executes a method to manage an engine connect/disconnect decision in a powertrain having an engine, transmission, electric machine, and a battery pack and power inverter module (“TPIM”). In response to vehicle ground speed being less than a calibrated maximum electric vehicle accelerator pedal signal (“EVAPS”) level, the controller calculates a delta APS (“ΔPS”) value by subtracting a scaled APS value from the actual APS level. The scaled APS value is a scaled variant of a maximum EVAPS value selected from a maximum EVSAPS table, the latter populated based on inverter temperature, state of charge of the battery pack, and ground speed. When the ΔAPS value exceeds a threshold, the controller connects the engine to the transmission via an engine disconnect clutch. The engine is disconnected based on acceleration of the vehicle and the above-noted factors.
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42.发明申请公开(公告)号：US20210129686A1
公开(公告)日：2021-05-06
申请号：US16675730
申请日：2019-11-06
摘要： An electric propulsion system includes a battery pack and a DC-DC converter. The converter has a bypass switch and semiconductor switches. A traction power inverter module (“TPIM”) rectifies a DC bus voltage on the voltage bus to produce an AC bus voltage. An electric machine is connected to the TPIM and energized via the AC bus voltage. A controller calculates required output power from the converter based on a requested operating mode, and speed and torque of the electric machine. When the output power exceeds a threshold, the bypass switch closes to bypass the converter. When the output power is less than the threshold, the controller uses a minimum loss voltage from a loss map as a target control voltage of the converter to optimize efficiency of the electric propulsion system.
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公开(公告)号：US10900458B2
公开(公告)日：2021-01-26
申请号：US16406658
申请日：2019-05-08
发明人： Suresh Gopalakrishnan , Paul S. Lombardo , David W. Walters , Chunhao J. Lee , Chandra S. Namuduri , Neeraj S. Shidore , Thomas W. Nehl
摘要： A method of stopping an engine crankshaft includes selecting a target angular position at which the engine crankshaft is to be stopped and detecting an actual angular position of the engine crankshaft and a rotational speed of the engine crankshaft. A stopping torque in calculated based on the actual angular position of the engine crankshaft and the rotational speed of the engine crankshaft. The stopping torque is applied to the engine crankshaft via a motor/generator operably connected to the engine crankshaft. The engine crankshaft is stopped at the target angular position via the application of the stopping torque.
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公开(公告)号：US10574116B2
公开(公告)日：2020-02-25
申请号：US15961119
申请日：2018-04-24
IPC分类号： H02K7/20 , H02K1/08 , F02N11/08 , H02K19/10 , H02K11/215 , H02K11/30 , H02P25/092
摘要： A starter includes a three-phase switched reluctance electric motor including a rotor and a stator, a pinion gear, a power inverter that is connected to the stator, and a rotational position sensor. The rotor includes a quantity of rotor poles that is between 6 and 16, and the stator includes a quantity of stator poles that is between 8 and 24. An outer diameter of the electric motor is less than 85 mm. An active length of the motor is less than 50 mm. An airgap distance between the rotor and the stator is between 0.1 mm and 0.5 mm. A ratio between a rotor pole arc and a stator pole arc is at least 1.0:1. A ratio between a stator diameter and a rotor diameter is at least 2.0:1, and a ratio between a stator pole height and a rotor pole height is at least 2.5:1.
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45.发明授权公开(公告)号：US10511213B2
公开(公告)日：2019-12-17
申请号：US15723476
申请日：2017-10-03
发明人： Shifang Li , Thomas W. Nehl , Suresh Gopalakrishnan , Avoki Omekanda , Rashmi Prasad , Chandra S. Namuduri
IPC分类号： H01H47/00 , H02K33/18 , H01F7/18 , F02M47/02 , F02M63/00 , H01F7/08 , F02M61/12 , H02K33/02 , H01F7/04 , H02K33/10 , F02M51/06 , H01F7/16
摘要： A solenoid assembly includes a solenoid actuator having a core. A coil is configured to be wound at least partially around the core such that a magnetic flux (ϕ) is generated when an electric current flows through the coil. An armature is configured to be movable based on the magnetic flux (ϕ). A controller has a processor and tangible, non-transitory memory on which is recorded instructions for controlling the solenoid assembly. The controller is configured to obtain a plurality of model matrices, a coil current (i1) and an eddy current (i2). The magnetic flux (ϕ) is obtained based at least partially on a third model matrix (C0), the coil current (i1) and the eddy current (i2). Operation of the solenoid actuator is controlled based at least partially on the magnetic flux (ϕ). In one example, the solenoid actuator is an injector.
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公开(公告)号：US20190326790A1
公开(公告)日：2019-10-24
申请号：US15961176
申请日：2018-04-24
发明人： Lei Hao , Chandra S. Namuduri , Alexandru Rajala , Thomas W. Nehl , Suresh Gopalakrishnan , Avoki M. Omekanda
摘要： A brushless electric motor includes a motor casing having a first bearing, a motor end-cap including a second bearing, a multi-phase stator assembly, and a rotor assembly having a rotor shaft. The shaft has a first end, a second end, and a knurled section therebetween. The shaft also has a first bearing surface proximate the first end and supported by the first bearing, a second bearing surface proximate the second end and supported by the second bearing, and a rotor position and speed sensor target. The shaft additionally has a sun gear integrated with the shaft proximate the first bearing surface for engaging a partial planetary gear set. The rotor assembly also includes a rotor lamination fixed to the shaft at the knurled section and having opposing first and second sides, and first and second end plates arranged on the respective first and second sides of the rotor lamination.
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公开(公告)号：US20190323469A1
公开(公告)日：2019-10-24
申请号：US15961094
申请日：2018-04-24
摘要： An electric starter system includes a brushless alternating current (AC) starter motor selectively coupled to an engine and having a rotor with a rotor position. A position sensor generates measured position signals indicative of rotor position. A controller is in communication with the sensor. The controller has sensorless logic, e.g., a BEMF, inductance, or high-frequency signal injection method, for generating an estimated rotor position. The controller executes a method in which, below a threshold speed of the starter motor, the controller calibrates the sensorless logic using the measured position signals and controls a torque operation of the starter motor using the measured position signals. Above the threshold speed, the torque operation is controlled solely using the estimated rotor position. A powertrain includes the engine, a transmission, a drive shaft, and a load, along with the electric starter system.
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48.发明授权公开(公告)号：US10408184B1
公开(公告)日：2019-09-10
申请号：US15967915
申请日：2018-05-01
摘要： An electric starter system for a powertrain or other system having an engine includes a solenoid device coupled to a pinion gear, a brushless starter motor, and a controller. The starter motor has actual machine speed, and is connectable to the flywheel via the pinion gear during a change-of-mind event when a commanded engine auto-stop sequence is interrupted before completion. When engine speed exceeds a threshold speed and is less than a calibrated starting speed, the controller executes a method in which closed-loop speed control of the starter motor is enabled using the engine speed as a reference value until an effective machine speed is within a permissible speed delta of engine speed. The controller causes the solenoid device to translate the pinion gear into engagement with the flywheel and starter motor, disables closed-loop speed control, and commands the starter motor to start the engine.
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公开(公告)号：US10207699B2
公开(公告)日：2019-02-19
申请号：US15722357
申请日：2017-10-02
发明人： Chandra S. Namuduri , Venkata Prasad Atluri , Suresh Gopalakrishnan , Jin-Woo Lee , Kevin J. Robinet , Sai Rajagopalan , Chen-fang Chang , Michael Livshiz , Patrick J. O'leary
IPC分类号： B60W20/00 , B60W20/12 , B60W20/15 , B60W40/04 , B60W40/076
摘要： A vehicle propulsion system includes a combustion engine configured to output a propulsion torque to satisfy a propulsion demand, and a traction electric machine to generate a supplemental torque to selectively supplement the propulsion torque. The propulsion system also includes a controller programmed to forecast an acceleration demand based on at least one estimation model. The controller is also programmed to issue a command indicative of a required axle torque corresponding to the acceleration demand. The controller is further programmed to engage at least one fuel conservation action in response to the required axle torque being within a first predetermined torque threshold range.
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公开(公告)号：US10189469B2
公开(公告)日：2019-01-29
申请号：US14663553
申请日：2015-03-20
发明人： Venkata Prasad Atluri , Suresh Gopalakrishnan , Michael G. Reynolds , Chandra S. Namuduri , Kenneth J. Shoemaker , David W. Walters
摘要： A method of controlling a powertrain of a vehicle includes opening and/or closing one or more of a first switching device, a second switching device, a third switching device, and engaging and/or disengaging at least one of a pair of actuators for a starter mechanism or a motor/generator clutch. Many different control modes are provided for the powertrain by changing the operation of a motor-generator between a motor or a generator, and changing the electrical connections between a first energy storage device, a second energy storage device, an auxiliary electric system, the starter mechanism, and the motor-generator.
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