Method for reducing a tip-in shock of an automatic transmission
First Claim
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1. A method for reducing tip-in shock in an automatic transmission, comprising:
- determining whether an engine torque reduction control condition is satisfied when tip-in occurs during downshift control in a coasting state;
limiting an engine torque by limiting throttle opening through control of an ETC when the engine torque reduction control condition is satisfied; and
releasing the engine torque limitation.
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Abstract
In the case a tip-in occurs during a downshift control in a coasting state of a vehicle, when an engine torque reduction control condition is satisfied, an engine torque is limited by limiting a throttle opening. The limited engine torque is gradually recovered to a normal torque through a plurality of ramp control processes.
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Citations
17 Claims
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1. A method for reducing tip-in shock in an automatic transmission, comprising:
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determining whether an engine torque reduction control condition is satisfied when tip-in occurs during downshift control in a coasting state;
limiting an engine torque by limiting throttle opening through control of an ETC when the engine torque reduction control condition is satisfied; and
releasing the engine torque limitation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for reducing tip-in shock in an automatic transmission, comprising:
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determining whether an engine torque reduction control condition is satisfied when tip-in occurs during downshift control in a coasting state;
limiting engine torque when the engine torque reduction control condition is satisfied; and
releasing the engine torque limitation. - View Dependent Claims (10, 11, 12)
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13. A system for reducing tip-in shock in an automatic transmission, comprising:
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at least an engine speed detector, a coolant temperature detector and a throttle opening detector, each generating signals indicative of a respective engine state;
an electronic throttle control;
an engine control unit configured to receive said engine state signals and control the electronic throttle control, said control unit programmed to execute instructions for determining whether an engine torque reduction control condition is satisfied when tip-in occurs during a downshift control in a coasting state;
controlling the electronic throttle control to limit engine torque by limiting throttle opening when the engine torque reduction control condition is satisfied; and
releasing the engine torque limitation. - View Dependent Claims (14, 15, 16, 17)
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Specification