Apparatus and method for controlling a speed change of an automatic transmission
First Claim
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1. A speed change control apparatus for an automatic transmission comprising:
- running resistance calculation means for calculating a vehicle running resistance;
drive force calculation means for calculating a drive force;
down-shift requirement outputting means for outputting a down-shift requirement when said running resistance is greater than the sum of said drive force and a threshold value;
accelerator opening detecting means for detecting an accelerator opening;
judgement level setting means for setting a judgement level of said accelerator opening higher as the accelerator opening increases;
down-shift requirement cancellation means for canceling said down-shift requirement output from said down-shift requirement output means, when said accelerator opening detected by said accelerator opening detecting means is smaller than said judgement level; and
down-shift control means for carrying out a down-shift based on said down-shift requirement.
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Abstract
A down-shift is carried out when a) the sum of a dry force of a vehicle and a predetermined value, is smaller than a running resistance, and b) when an accelerator opening is larger than a threshold value which is based on vehicle speed, road inclination, and speed change step (gear position).
27 Citations
6 Claims
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1. A speed change control apparatus for an automatic transmission comprising:
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running resistance calculation means for calculating a vehicle running resistance;
drive force calculation means for calculating a drive force;
down-shift requirement outputting means for outputting a down-shift requirement when said running resistance is greater than the sum of said drive force and a threshold value;
accelerator opening detecting means for detecting an accelerator opening;
judgement level setting means for setting a judgement level of said accelerator opening higher as the accelerator opening increases;
down-shift requirement cancellation means for canceling said down-shift requirement output from said down-shift requirement output means, when said accelerator opening detected by said accelerator opening detecting means is smaller than said judgement level; and
down-shift control means for carrying out a down-shift based on said down-shift requirement. - View Dependent Claims (2)
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3. A speed change control apparatus for automatic transmission comprising:
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running resistance calculation means for calculating a vehicle running resistance;
drive force calculation means for calculating a drive force;
down-shift requirement outputting means for outputting a down-shift requirement when said running resistance is greater than the sum of said drive force and a threshold value;
accelerator opening detecting means for detecting an accelerator opening;
judgement level setting means for setting a judgement level of said accelerator opening higher as an uphill incline of a running road surface of the vehicle increases;
down-shift requirement cancellation means for canceling said down-shift requirement output from said down-shift requirement output means, when said accelerator opening detected by said accelerator opening detecting means is smaller than said judgement level; and
down-shift control means for carrying out a down-shift based on said down-shift requirement.
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4. A speed change control method for an automatic transmission comprising the following steps of:
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calculating a vehicle running resistance;
calculating a drive force;
outputting a down-shift requirement when said running resistance is greater than the sum of said drive force and a threshold value;
detecting an accelerator opening;
detecting a vehicle speed setting a judgement level of said accelerator opening higher as the vehicle speed increases;
canceling said down-shift requirement, when said accelerator opening is smaller than said judgement level. - View Dependent Claims (5)
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6. A speed change control method for an automatic transmission comprising the following steps of:
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calculating a vehicle running resistance;
calculating a drive force;
outputting a down-shift requirement when said running resistance is greater than the sum of said drive force and a threshold value;
detecting an accelerator opening;
setting a judgement level higher as an uphill incline of a running road surface of the vehicle is steeper; and
canceling said down-shift requirement, when said accelerator opening is smaller than said judgement level.
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Specification