System and method for estimating current in a motor control circuit for improved performance and diagnostics
A technology for controlling circuits and motors, used in motor control, control systems, engine control, etc., to solve problems such as intermittent, increased cost, weight, and complexity of parts that may fail
Inactive Publication Date: 2016-02-03
GM GLOBAL TECH OPERATIONS LLC
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Second, some error states are intermittent
Accurate shunt resistors and Hall effect sensors, and associated analog-to-digital converters add cost, weight, and complexity (more parts to fail)
Method used
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[0057] Systems and methods for estimating current in a motor control circuit can be implemented in a variety of different applications. For purposes of illustration, the electronically controlled throttle of an automobile will be the subject of this specification. It should be understood that the techniques described herein are applicable to other types of motor control circuits as well. The illustrated technique for estimating current is applied to improve reliability and analysis of a malfunctioning electronic throttle control (ETC) system by extending the utility of existing software and electric motor control hardware capabilities in a vehicle's engine control module (ECM). When applied as described herein, this technique provides a specific range of current flow through the electronic throttle motor control circuit.
[0058] A typical ECM electronic throttle motor control circuit includes an H-bridge driver IC, a DC commutator motor in the throttle body assembly, serial ...
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The present invention relates to systems and methods for estimating current in motor control circuits for improved performance and diagnostics. An error condition detection circuit coupled to the motor control circuit reports an error condition when actual motor operation deviates from a predetermined desired motor operation. An overcurrent threshold comparator compares motor current to a threshold data value stored in a data storage register and sets an overcurrent flag when the motor current exceeds the threshold. a current interrogation processor monitors for a reported error condition and is programmed to read said overcurrent flag repeatedly and decrease said overcurrent threshold data value by a predetermined decrement amount until said overcurrent flag becomes set, while Respond to an error condition. The current interrogation processor is further programmed to report an overcurrent threshold data value present at the time the overcurrent flag became set as an estimate of current.
Description
technical field [0001] The present disclosure relates to current monitoring in control circuits, such as motor control circuits. More particularly, the present disclosure relates to current interrogation techniques suitable for processors or microcontrollers implemented in vehicle engine control modules, for use in applications such as electronic throttle motor diagnostics and control. Background technique [0002] The background description provided herein is for the purpose of generally presenting the context of the disclosure. The work of the presently named inventors, to the extent described in this Background section, and aspects of the specification that may not otherwise constitute prior art at the time of filing, are neither expressly nor impliedly admitted to be inconsistent with this disclosure existing technology. [0003] In a diagnostic system utilizing an electric control device of a motor or other actuator, it is difficult to discern the exact cause of an er...
Claims
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IPC IPC(8): G05B23/02
CPCH02P23/14G01R31/40G01R31/2829F02D41/221F02D11/107F02D2041/2058Y02T10/40H02P29/0241
Inventor J.E.普罗查P.A.鲍尔勒
Owner GM GLOBAL TECH OPERATIONS LLC