EP0238310A2
Expired / Lapsed
EP
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Apparatus for controlling an automatic gear transmission
Assignee: Fujitsu Ltd
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Filing: 1987-03-17
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Granted: —
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Expires: 2007-03-17
Abstract
Abstract Apparatus for controlling by commanding an optimum gear position based on the speed of travel of the vehicle and the amount of accelerator opening thereof, comprises a control circuit (2) including first computing means for computing the engine output for the optimum gear position and second computing means for computing the running resistance of the vehicle for the optimum gear position. A comparator compares the computed engine output and the computed running resistance, and the optimum gear position is modified based on the result of the comparison effected by the comparison means. If the optimum gear position requires a shift-up from the present gear position, the shift-up to the otpimum gear position is inhibited if the running resistance is larger than the engine output. If the optimum gear position is the present gear position, the gear transmission is shifted down if the running resistance is larger than the engine output for the present gear position.
Inventors
- 👤 Hiroshi Yoshimura
- 👤 Youichi Iida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
F; F16; F16H; F16H59/00; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; B; B60; B60K; B60K31/00; F16H59/14; F16H2059/142; F16H59/74; F16H2059/743; F16H2061/0075; F16H2061/0096; F16H2061/0234; F16H59/18; F16H59/36; F16H59/44; F16H59/60; F16H59/66
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
Apparatus for controlling an automatic gear transmission (4) in a motor vehicle by commanding an optimum gear position thereof based on the speed of travel of the vehicle and the amount of accelerator opening thereof, characterised by a control circuit (2) comprising first computing means for computing an engine output for the optimum gear position; second computing means for computing the running resistance of the vehicle for the optimum gear position; comparison means for comparing the computed engine output and the computed running resistance; and command modifying means for modifying the optimum gear position based on the result of the comparison effected by the comparison means.
Claim 2
Dependent Claim
106 words
Apparatus for controlling an automatic gear transmission (4) in a motor vehicle by commanding an optimum gear position thereof based on the speed of travel of the vehicle and the amount of accelerator opening thereof, characterised by a control circuit (2) comprising first computing means for computing an engine output for the optimum gear position; second computing means for computing the running resistance of the vehicle for the optimum gear position; comparison means for comparing the computed engine output and the computed running resistance; and command modifying means for modifying the optimum gear position based on the result of the comparison effected by the comparison means.
Claim 3
Dependent Claim
132 words
Apparatus for controlling an automatic gear transmission (4) in a motor vehicle by commanding an optimum gear position thereof based on the speed of travel of the vehicle and the amount of accelerator opening thereof, characterised by a control circuit (2) comprising first computing means for computing an engine output for the optimum gear position if the optimum gear position requires a shift-up from the present gear position; second computing means for computing the running resistance of the vehicle for the optimum gear position; comparison means for comparing the computed engine output and the computed running resistance; and command modifying means for inhibiting a shift-up to the optimum gear position if the running resistance is larger than the engine output based on the result of the comparison effected by the comparison means.
Claim 4
Dependent Claim
132 words
Apparatus for controlling an automatic gear transmission (4) in a motor vehicle by commanding an optimum gear position thereof based on the speed of travel of the vehicle and the amount of accelerator opening thereof, characterised by a control circuit (2) comprising first computing means for computing an engine output for the optimum gear position if the optimum gear position requires a shift-up from the present gear position; second computing means for computing the running resistance of the vehicle for the optimum gear position; comparison means for comparing the computed engine output and the computed running resistance; and command modifying means for inhibiting a shift-up to the optimum gear position if the running resistance is larger than the engine output based on the result of the comparison effected by the comparison means.
Claim 5
Dependent Claim
135 words
Apparatus for controlling an automatic gear transmission (4) in a motor vehicle by commanding an optimum gear position thereof based on the speed of travel of the vehicle and the amount of accelerator opening thereof, characterised by a control circuit (2) comprising first computing means for computing an engine output for the present gear position if the optimum gear position is the present gear position; second computing means for computing the running resistance of the vehicle for the present gear position; comparison means for comparing the computed engine output and the computed running resistance; and command modifying means for modifying the optimum gear position into a lower gear position and for commanding a shift-down if the running resistance is larger than the engine output based on the result of comparison effected by the comparison means.
Claim 6
Dependent Claim
135 words
Apparatus for controlling an automatic gear transmission (4) in a motor vehicle by commanding an optimum gear position thereof based on the speed of travel of the vehicle and the amount of accelerator opening thereof, characterised by a control circuit (2) comprising first computing means for computing an engine output for the present gear position if the optimum gear position is the present gear position; second computing means for computing the running resistance of the vehicle for the present gear position; comparison means for comparing the computed engine output and the computed running resistance; and command modifying means for modifying the optimum gear position into a lower gear position and for commanding a shift-down if the running resistance is larger than the engine output based on the result of comparison effected by the comparison means.
Claim 7
Dependent Claim
28 words
Apparatus according to Claim 3, characterised in that the command modifying means modifies the commanded gear position to be one gear position lower than the optimum gear position.
Claim 8
Dependent Claim
38 words
Apparatus according to Claim 3 or Claim 4, characterised by means for ascertaining whether a prescribed time has elapsed after a gear shift to the present gear position when the optimum gear position is the present gear position.
Claim 9
Dependent Claim
35 words
Apparatus according to Claim 3 or Claim 4, characterised by means for ascertaining whether the present gear position is higher than a predetermined gear position when the optimum gear position is the present gear position.
Claim 10
Dependent Claim
34 words
Apparatus according to Claim 3 or Claim 4, characterised by means for ascertaining whether the amount of accelerator opening corresponds to a fully-open position when the optimum gear position is the present gear position.
Claim 11
Dependent Claim
40 words
Apparatus according to Claim 3 or Claim 4, characterised by means for ascertaining whether the engine will overrun when the gear transmission is shifted down to a commanded gear position if the optimum gear position is the present gear position.
Claim 12
Dependent Claim
59 words
Apparatus according to Claim 3 or Claim 4, characterised by means to determine in successive checks whether the running resistance is larger than the engine output for the present gear position and to step a decision counter each time the result is positive; and means for ascertaining whether the count of the decision counter has reached a predetermined number.
References Cited (Backward Citations)
No citation records indexed.
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