CONTROL DEVICE FOR AUTOMATIC TRANSMISSION
First Claim
1. A control device for an automatic transmission comprising:
- a current shift position detection unit adapted to detect a current shift position indicative of a current gear of the automatic transmission;
a possible shift position determination unit adapted to determine a gear after a possible shift-up according to a traveling state of a vehicle;
an engine operation state acquisition unit adapted to acquire a current engine operation state of a variable cylinder engine capable of switching between 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 cylinders of the variable cylinder engine are deactivated;
a calculation unit adapted to calculate, for each engine operation state to which the 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 the vehicle for each of the current gear and the gear after the possible shift-up determined by the possible shift position determination unit; and
a gear shift determination unit adapted to allow an automatic shift control to perform a shift-up to the gear after the possible shift-up, based on the calculated fuel consumption amount, 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.
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Accused Products
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.
40 Citations
5 Claims
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1. A control device for an automatic transmission comprising:
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a current shift position detection unit adapted to detect a current shift position indicative of a current gear of the automatic transmission; a possible shift position determination unit adapted to determine a gear after a possible shift-up according to a traveling state of a vehicle; an engine operation state acquisition unit adapted to acquire a current engine operation state of a variable cylinder engine capable of switching between 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 cylinders of the variable cylinder engine are deactivated; a calculation unit adapted to calculate, for each engine operation state to which the 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 the vehicle for each of the current gear and the gear after the possible shift-up determined by the possible shift position determination unit; and a gear shift determination unit adapted to allow an automatic shift control to perform a shift-up to the gear after the possible shift-up, based on the calculated fuel consumption amount, 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. - View Dependent Claims (2, 3, 4)
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5. A control device for an automatic transmission, comprising:
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a current shift position detection unit adapted to detect a current shift position indicative of a current gear of the automatic transmission; a driving force calculation unit adapted to calculate a minimum target driving force required to maintain a current traveling state of a vehicle; a possible shift position determination unit adapted to determine a gear after a possible shift-up according to the traveling state of the vehicle; an engine operation state acquisition unit adapted to acquire a current engine operation state of a variable cylinder engine capable of switching between 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 cylinders of the variable cylinder engine are deactivated; an estimated driving force calculation unit adapted to, 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 determined by the possible shift position determination unit; and a gear shift determination unit adapted to 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.
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Specification