Active driveline damping
First Claim
1. An internal combustion engine torque control method for varying engine output torque to reduce undesirable speed variation of an engine having a plurality of cylinders, each cylinder undergoing a torque producing combustion event in each of repeated engine cycles, comprising the steps of:
- identifying an engine speed variation operating condition; and
varying the torque produced in engine cylinder combustion events to reduce engine speed variation when the engine speed variation operating condition is identified, by(a) determining a current engine operating angle;
(b) estimating an undesirable engine speed variation at the current engine operating angle;
(c) phase compensating the estimated engine speed variation from the determined current engine operating angle to the engine operating angle at a next cylinder combustion event;
(d) calculating an engine cylinder output torque change value for the next cylinder combustion event as a predetermined function of the phase compensated engine speed change value; and
(e) controlling the torque produced at the next cylinder combustion event in accordance with the calculated engine cylinder output torque change value.
14 Assignments
0 Petitions
Accused Products
Abstract
Internal combustion engine torque control for damping undesirable engine speed variation measures the variation as a high frequency engine speed variation at a known engine operating angle and, for each cylinder combustion event while the variation is present, calculates a phase-compensated desired torque change to dampen the engine speed variation by projecting the engine speed variation phase at the known engine operating angle to the phase at a next combustion event, and to calculate an opposing cylinder output torque change to dampen the engine speed variation phase at that next combustion event. The torque change is then carried out through ignition timing variation at the combustion event or through variation in the amount of fuel delivered for ignition at the combustion event.
55 Citations
12 Claims
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1. An internal combustion engine torque control method for varying engine output torque to reduce undesirable speed variation of an engine having a plurality of cylinders, each cylinder undergoing a torque producing combustion event in each of repeated engine cycles, comprising the steps of:
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identifying an engine speed variation operating condition; and varying the torque produced in engine cylinder combustion events to reduce engine speed variation when the engine speed variation operating condition is identified, by (a) determining a current engine operating angle; (b) estimating an undesirable engine speed variation at the current engine operating angle; (c) phase compensating the estimated engine speed variation from the determined current engine operating angle to the engine operating angle at a next cylinder combustion event; (d) calculating an engine cylinder output torque change value for the next cylinder combustion event as a predetermined function of the phase compensated engine speed change value; and (e) controlling the torque produced at the next cylinder combustion event in accordance with the calculated engine cylinder output torque change value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An internal combustion engine torque control method for damping engine speed disturbances by controlling torque production of engine cylinder combustion events in which an air/fuel mixture is ignited in engine cylinders, comprising the steps of:
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detecting a presence of an engine speed disturbance; and for each of a plurality of engine cylinder combustion events following a detected presence of the engine speed disturbance, (a) identifying the engine operating angle at the combustion event, (b) defining an engine cylinder event prior to the combustion event and identifying the engine operating angle at the defined engine cylinder event, (c) estimating the engine speed disturbance magnitude at the defined engine cylinder event, (d) phase compensating the engine speed disturbance to project the engine speed disturbance magnitude at the combustion event, (e) determining an engine cylinder torque change opposing the projected engine speed disturbance magnitude, and (f) controlling torque production at the engine cylinder combustion event in accord with the determined engine cylinder torque change to damp the engine speed disturbance. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification