Control device for automatic transmission
AssigneeHonda Motor Co., Ltd.
InventorsHiroshi Saito, Yutaka Ishikawa
Life of this patent
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Abstract
For each engine operation state to which a variable cylinder engine can be switched, a fuel consumption amount to be consumed to generate a driving force required to maintain a current traveling state of a vehicle for each of a current gear and a new gear after a possible shift-up is calculated. An automatic shift control of shifting up to the new gear is performed in a condition that a calculated fuel consumption amount of the new gear after the possible shift-up is smaller than a calculated fuel consumption amount of the current gear. In this way, the fuel consumption amount can be optimally reduced and the shift control can be performed without degrading the traveling performance, even in the vehicle equipped with the variable cylinder engine.
Claims5
A control device for an automatic transmission comprising:
- a detector configured to detect a current shift position indicative of a current gear of the automatic transmission;
- and
- a processor configured to:
- determine a gear after a possible shift-up according to a traveling state of a vehicle;
- acquire information indicative of a current engine operation state of a variable cylinder engine capable of switching between a plurality of engine operation states including a full-cylinder operation in which all cylinders of the variable cylinder engine are operated and a cylinder deactivation operation in which one or more of the cylinders of the variable cylinder engine are deactivated;
- calculate, for each of the plurality of engine operation states, a fuel consumption amount to be consumed to generate a driving force required to maintain a current traveling state of the vehicle for the current gear and a fuel consumption amount to be consumed to generate the driving force required to maintain the current traveling state of the vehicle for the gear after the possible shift-up;
- and
- allow an automatic shift control to perform a shift-up to the gear after the possible shift-up, based on the calculated fuel consumption amounts for the plurality of engine operation states, when a calculated fuel consumption amount of the gear after the possible shift-up is smaller than a calculated fuel consumption amount of the current gear.
A control device for an automatic transmission, comprising:
- a detector configured to detect a current shift position indicative of a current gear of the automatic transmission;
- and
- a processor configured to:
- calculate a minimum target driving force required to maintain a current traveling state of a vehicle;
- determine a gear after a possible shift-up according to the traveling state of the vehicle;
- acquire information indicative of a current engine operation state of a variable cylinder engine capable of switching between a plurality of engine operation states including a full-cylinder operation in which all cylinders of the variable cylinder engine are operated and a cylinder deactivation operation in which one or more of the cylinders of the variable cylinder engine are deactivated;
- when the acquired current engine operation state is the cylinder deactivation operation, calculate an estimation of a driving force after a shift-up required to maintain the current cylinder deactivation operation with the gear after the possible shift up;
- and
- allow an automatic shift control to perform a shift-up to the gear after the possible shift-up when the calculated estimation of a driving force after a shift-up is above the target driving force.
Dependencies are inferred from the claim text.