US6750626B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diagnostic strategy for an electric motor using sensorless control and a position sensor
Assignee: Ford Global Technologies LLC
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Filing: 2002-09-11
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Granted: 2004-06-15
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Expires: 2022-09-11
Abstract
Abstract A strategy to control and diagnose the operation of an electric motor using a sensorless control system augmented by feedback from a position and speed sensor is disclosed. The strategy can improve the robustness of operation and diagnose potential faults in electric motors. The present invention includes a method for diagnosing operation of an electric motor and a method and system for controlling an electric motor. In the diagnostic method, a sensorless system and a sensor based system are checked against each other to determine if either of the systems is faulted. In the control method, the sensor based control system is used when the motor speed is below a predetermined threshold and the sensorless system is used when the motor speed is above the predetermined threshold. The position sensor can be a low resolution position sensor, an engine crankshaft sensor, an engine camshaft sensor, or a transmission sensor.
Inventors
- 👤 Franco Leonardi
- 👤 Henry Heping Huang
- 👤 John Michael Miller
- 👤 Michael W. Degner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:12
CPC Classifications
B; B60; B60W; B60W20/00; B60K; B60K6/00; B60K6/20; B60K6/22; B60K6/36; B60K6/365; B60K6/42; B60K6/48; B60L; B60L3/00; B60L3/0023; B60L50/00; B60L50/10; B60L50/16; B60L50/50; B60L50/60; B60L50/61; B60L7/00; B60L7/10; B60L7/14; B60W10/00; B60W10/04; B60W10/08; B60W50/00; H; H02; H02P; H02P23/00; H02P23/03; H02P6/00; H02P6/14; H02P6/16; H02P6/18; B60K1/00; B60K1/02; B60L2220/00; B60L2220/10; B60L2220/18; B60L2240/00; B60L2240/40; B60L2240/42; B60L2240/421; B60L2240/423; B60W2510/00; B60W2510/06; B60W2510/0685; B60W2510/08; B60W2510/081; B60W2710/00; B60W2710/08; B60W2710/083; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/62; Y02T10/64; Y02T10/70; Y02T10/7072
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A method for diagnosing operation of an electric motor, comprising: determining a first shaft position using a sensorless control system; determining a second shaft position using a position sensor; and evaluating operation of said electric motor based at least in part on a comparison of said first shaft position to said second shaft position; transmitting a modified shaft position to a torque controller from a position estimator based on said evaluation of said electric motor; transmitting a voltage command from said torque controller to an inverter based at least in part on said modified shaft position unless the evaluation indicates inoperability of said position estimator, said torque controller calculating and transmitting said voltage command based on using the sensorless control system during inoperability of said position estimator.
Claim 2
Independent Claim
127 words
A method for diagnosing operation of an electric motor, comprising: determining a first shaft position using a sensorless control system; determining a second shaft position using a position sensor; and evaluating operation of said electric motor based at least in part on a comparison of said first shaft position to said second shaft position; transmitting a modified shaft position to a torque controller from a position estimator based on said evaluation of said electric motor; transmitting a voltage command from said torque controller to an inverter based at least in part on said modified shaft position unless the evaluation indicates inoperability of said position estimator, said torque controller calculating and transmitting said voltage command based on using the sensorless control system during inoperability of said position estimator.
Claim 3
Dependent Claim
22 words
The method according to claim 1 , further comprising evaluating operation of said sensorless control scheme based on said second shaft position.
Claim 4
Dependent Claim
21 words
The method according to claim 1 , further comprising evaluating operation of said position sensor based on said first shaft position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-06-15 | 2007-12-15 | 2008-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-06-15 | 2011-12-15 | 2012-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-06-15 | 2015-12-15 | 2016-06-15 | $7700.00 | Window Closed / Lapsed |