Patent EP0043184A2 successfully refreshed from Google Patents.
EP0043184A2
Expired / Lapsed
EP
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Control systems for continuously variable ratio transmissions
Assignee: BL Technology Ltd
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Filing: 1981-05-29
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Granted: —
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Expires: 2001-05-29
Abstract
Abstract A transmission incorporates a continuously variable ratio unit (1) connected to further gearing (2) such that a plurality of regimes are available with synchronous shifting between regimes. The transmission is controlled such that to avoid hunting between regimes when the transmission is running at or around the synchronous ratio, regime and ratio changing beyond the synchronous ratio is inhibited until the optimum ratio for the prevailing operating conditions differs from the synchronous by a predetermined value.
Inventors
- 👤 Peter William Robert Stubbs
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 04:43
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H37/086; F16H15/00; F16H15/02; F16H15/04; F16H15/06; F16H15/32; F16H15/36; F16H15/38; F16H61/00; F16H61/66; F16H61/664; F16H61/6646; F16H2015/383; F16H2037/088; F16H2061/6604; F16H2061/6614; F16H61/10; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
1 A transmission including a continuously variable ratio unit (1) connected to further gearing (2) and a clutch (8) a nd/or brake (9) such that operation of the transmission is possible in two regimes with synchronous changing between the regimes, characterised by a control system for controlling the transmission ratio which ensures that when the synchronous ratio is reached during ratio changing in a given regime, regime changing is inhibited and the transmission ratio is not permitted to pass the synchronous ratio until the optimum transmission ratio differs from the actual transmission ratio by a predetermined value (Σ).
Claim 2
Dependent Claim
98 words
1 A transmission including a continuously variable ratio unit (1) connected to further gearing (2) and a clutch (8) a nd/or brake (9) such that operation of the transmission is possible in two regimes with synchronous changing between the regimes, characterised by a control system for controlling the transmission ratio which ensures that when the synchronous ratio is reached during ratio changing in a given regime, regime changing is inhibited and the transmission ratio is not permitted to pass the synchronous ratio until the optimum transmission ratio differs from the actual transmission ratio by a predetermined value (Σ).
Claim 3
Dependent Claim
42 words
2 A transmission as claimed in claim 1, characterised in that said difference in ratios is assessed by reference to the speed of a motor driving an input (3) of the transmission and the difference of this speed from an optimum speed.
Claim 4
Dependent Claim
28 words
3 A transmission as claimed in claim 1 or 2, characterised in that it remains in a regime until said difference in ratios reaches said predetermined value (Σ).
Claim 5
Dependent Claim
77 words
4 A transmission as claimed in claim 1 or 2, including a plurality of brake (9) and/or clutch means (8) one of which is engaged in one said regime, the other being engaged in the other said regime, characterised in that both said brake and/or clutch means are engaged when the synchronous ratio is reached to hold said transmission ratio at the synchronous ratio until the optimum ratio differs from the synchronous by said pre- determined value(Σ).
Claim 6
Dependent Claim
34 words
5 A transmission as claimed in claim 4, characterised in that said continuously variable ratio unit (1) is set to transmit no torque when both said brake (9) and/or clutch means (8) are engaged.
Claim 7
Dependent Claim
19 words
6 A transmission as claimed in any preceding claim, characterised in that said predetermined value (Σ) is a constant.
Claim 8
Dependent Claim
19 words
7 A transmission as claimed in claim 6, characterised in that said predetermined value (Σ) is a fixed percentage.
Claim 9
Dependent Claim
23 words
8 A transmission as claimed in claim 2 and claim 6, Characterised in that said predetermined value (Σ) is a fixed speed differenceo.
Claim 10
Dependent Claim
36 words
9 A transmission as claimed in claim 2 or any one of claims 3, 4 or 5 dependent on claim 2, characterised in that said predetermined value (Σ) is varied in accordance with engine operating parameters.
Claim 11
Dependent Claim
34 words
10 A transmission as claimed in any one of claims 1 to 5, characterised in that said predetermined value (Σ) when said transmission ratio is ascending is different to when the ratio is descencling.
References Cited (Backward Citations)
No citation records indexed.
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