Torque estimation for engine speed control
First Claim
1. An engine speed control method for controlling engine output torque in accord with an engine torque requirement determined as the torque required to drive engine speed toward a target engine speed, comprising the steps of:
- storing a predetermined schedule of estimated steady state torque requirement values as a function of a predetermined engine operating condition;
determining the current engine operating condition;
referencing, from the stored schedule, a current estimated steady state torque requirement as a function of the current engine operating condition;
estimating steady state torque requirement error;
adjusting the current steady state torque requirement in direction to minimize the estimated steady state torque requirement error; and
controlling engine output torque in accord with the adjusted current steady state torque requirement.
14 Assignments
0 Petitions
Accused Products
Abstract
Engine torque control as a function of a steady state and a transient torque control command to drive engine speed toward a target engine speed provides for a correction to the steady state torque control command to account for unmodelled effects of such slowly changing parameters as ambient temperature and pressure and engine coolant temperature, by determining a difference between an expected and an actual engine control parameter as function of the current engine operating level, translating such difference to an engine torque requirement deviation caused by unmodelled effects, and providing a torque correction therefor so that compensation may be provided in an appropriate manner for the unmodelled effects. The torque correction may further be stored as a function of the current value of the slowly changing parameters to develop a stored model which may be accessed, once developed, to provide the compensation with minimum on-line computation.
73 Citations
14 Claims
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1. An engine speed control method for controlling engine output torque in accord with an engine torque requirement determined as the torque required to drive engine speed toward a target engine speed, comprising the steps of:
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storing a predetermined schedule of estimated steady state torque requirement values as a function of a predetermined engine operating condition; determining the current engine operating condition; referencing, from the stored schedule, a current estimated steady state torque requirement as a function of the current engine operating condition; estimating steady state torque requirement error; adjusting the current steady state torque requirement in direction to minimize the estimated steady state torque requirement error; and controlling engine output torque in accord with the adjusted current steady state torque requirement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14)
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9. An engine speed control method for generating a control command including a steady state torque control command component and a transient torque control command component, the control command applied to an engine output torque control actuator to drive engine speed toward a desired engine speed, comprising the steps of:
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providing a predetermined schedule of steady state torque control commands representing the torque required for steady state engine speed control, the schedule provided as a function of engine operating level; estimating the current engine operating level; referencing, from the provided schedule, the steady state torque control command as a function of the current engine operating level; estimating steady state torque control command error; determining a command adjustment as a function of the estimated steady state torque control command error; generating the control command as a function of the referenced steady state torque control command and the command adjustment; and applying the control command to the torque control actuator to control engine output torque to drive engine speed toward the desired engine speed. - View Dependent Claims (10, 11, 12, 13)
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Specification