Methods and systems for efficient engine torque control
First Claim
1. A method comprising:
- as a desired engine torque increases;
when not injecting fuel to engine cylinders, monotonically decreasing an alternator torque to a first level from a second level; and
in response to the alternator torque reaching the first level, stepping up the alternator torque from the first level to the second level while initiating engine combustion, and then monotonically decreasing the alternator torque from the second level to the first level.
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Abstract
Method and systems are provided for adjusting an engine torque in response to changes in a desired engine torque. In one example, a method may comprise responsive to increasing desired engine torques, monotonically decreasing an alternator torque to a first level from a second level when not injecting fuel to engine cylinders, and stepping up the alternator torque from the first level to the second level while initiating engine combustion, and then monotonically decreasing the alternator torque from the second level to the first level in response to the alternator torque reaching the first level. In this way, a method may comprise adjusting a load exerted on an engine by an alternator mechanically coupled to said engine during both cylinder combustion, and during non-fueling conditions.
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Citations
19 Claims
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1. A method comprising:
as a desired engine torque increases; when not injecting fuel to engine cylinders, monotonically decreasing an alternator torque to a first level from a second level; and in response to the alternator torque reaching the first level, stepping up the alternator torque from the first level to the second level while initiating engine combustion, and then monotonically decreasing the alternator torque from the second level to the first level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for adjusting an engine torque to match a desired engine torque comprising:
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during DFSO, when a throttle valve is in a first position and fuel is not injected to one or more engine cylinders, monotonically decreasing alternator torque to a first torque from a second torque as desired engine torque increases up to a first level; and during cylinder combustion, maintaining a position of the throttle valve in a second position and monotonically decreasing alternator torque from the first torque to the second torque as desired engine torque increases from the first level to a second level, and adjusting the position of the throttle valve between the second position and a third position as desired engine torque increases above the second level. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification