Shift control system of an automatic transmission
First Claim
1. A shift control system of an automatic transmission, comprising:
- a load detecting means for detecting a load of an engine;
a load change rate detecting means for detecting a change rate of the load of the engine; and
a shift characteristic altering means for altering a shift characteristic of the automatic transmission in accordance with the load of the engine and the change rate of the load of the engine in response to a signal from said load detecting means and said load change rate detecting means, respectively,wherein said shift characteristic altering means alters the shift characteristic of the automatic transmission to produce a higher output level of the engine in accordance with an output signal of the load change rate detecting means showing an increase in the change rate of the load of the engine.
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Accused Products
Abstract
A shift characteristic of an automatic transmission is altered in accordance with a load of an engine and a change rate the load of the engine. The shift characteristic may have a power mode and an economy mode, and the shift characteristic is switched between the power mode and the economy mode when the load of the engine becomes a predetermined reference value. When the load of the engine becomes equal to or larger than the reference value, the economy mode is shifted to the power mode. The reference value is changed in accordance with a change rate of the load of the engine, and the reference value becomes smaller as the change rate becomes larger. This construction allows the shift characteristic of the automatic transmission to be altered so as to be appropriate for the requirment by the operation for acceleration.
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Citations
13 Claims
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1. A shift control system of an automatic transmission, comprising:
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a load detecting means for detecting a load of an engine; a load change rate detecting means for detecting a change rate of the load of the engine; and a shift characteristic altering means for altering a shift characteristic of the automatic transmission in accordance with the load of the engine and the change rate of the load of the engine in response to a signal from said load detecting means and said load change rate detecting means, respectively, wherein said shift characteristic altering means alters the shift characteristic of the automatic transmission to produce a higher output level of the engine in accordance with an output signal of the load change rate detecting means showing an increase in the change rate of the load of the engine.
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2. A shift control system of an automatic transmission, comprising:
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a load detecting means for detecting a load of an engine; a shift characteristic altering means for altering a shift characteristic of the automatic transmission from a first shift characteristic to a second shift characteristic which is an output-oriented characteristic more than the first shift characteristic when the load of the engine becomes a value equal to or larger than a reference value in response to a signal from said load detecting means; a load change rate detecting means for detecting a change rate of the load of the engine; and
a reference value altering means for altering said reference value to a smaller value in accordance with the change rate of the load of the engine to be detected by said load change rate altering means when the change rate of the load of the engine is larger than when the change rate of the load of the engine is smaller. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification