EP0826909A2
Expired / Lapsed
EP
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System for estimating temperature of vehicle hydraulically-operated transmission
Assignee: Honda Motor Co Ltd
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Filing: 1997-08-22
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Granted: —
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Expires: 2017-08-22
Abstract
Abstract A system for estimating a temperature of a vehicle hydraulically-operated transmission (T) including a hydraulic torque converter (2), a plurality of frictional engaging elements (C1,C2,C3,C4R) such as clutches installed in the transmission and a hydraulic pressure supplying circuit (O) for discharging hydraulic fluid from one of said plurality of frictional engaging elements and for supplying hydraulic fluid to another to bring said one and another one of said plurality of frictional engaging elements into operation such that gear-shift is effected in the transmission. A heat quantity generated by the hydraulic coupling means (ΔTtr), a heat quantity generated by at least one of the frictional engaging elements at gear-shift (ΔTcl(No)), a heat quantity generated by stirring of the hydraulic fluid (ΔTst), a heat quantity generated or absorbed at a heat exchanger which exchanges heat from the fluid (ΔTra), and some similar values are calculated and summed to estimate a temperature of the clutches, thereby enabling a fine hydraulic pressure control.
Inventors
- 👤 Tatsuyuki Ohashi
- 👤 Yoshirou Tashiro
- 👤 Toshiyuki Suzuki
- 👤 Kaname Tokita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 10:21
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/04; F16H57/0412; F16H57/0413; F16H59/00; F16H59/68; F16H59/72; F16H57/0405; F16H57/0447; F16H59/36; F16H59/44; B; B60; B60W; B60W2510/00; B60W2510/06; B60W2510/0676; F16H59/46; F16H2059/465; F16H2059/467; F16H59/60; F16H59/64; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
217 words
A system for estimating a temperature of a vehicle hydraulically-operated
transmission (T) including a hydraulic coupling means (2) having an input
connected to an internal combustion engine (E) mounted on the vehicle and an output
connected to a gear system of the transmission, including: a plurality of frictional engaging elements (C1, C2, C3, C4R) installed in the
transmission; a hydraulic pressure supplying circuit (O) for discharging hydraulic pressure from one
of said plurality of frictional engaging elements and for supplying hydraulic pressure to
another one of said plurality of frictional engaging elements to bring said one and another
one of said plurality of frictional engaging elements into operation such that gear-shift is
effected in the transmission; characterized in that: coolant temperature detecting means (S7) for detecting a coolant temperature (Tw) of
the engine; first heat quantity calculating means (S16) for calculating a heat quantity generated by
the hydraulic coupling means; second heat quantity calculating means (S18) for calculating a heat quantity generated
by at least one of the frictional engaging elements (ΔTtr); and temperature estimating means (S26, S28) for estimating a temperature of at least one of
the frictional engaging elements (Tcl(No)) based on the detected engine coolant temperature
(Tw) and the calculated heat quantities (ΔTr, ΔTcl(No)) calculated by the first and second
heat quantity calculating means.
Claim 2
Independent Claim
269 words
A system for estimating a temperature of a vehicle hydraulically-operated
transmission (T) including a hydraulic coupling means (2) having an input
connected to an internal combustion engine mounted on the vehicle and an output connected
to a gear system of the transmission, including: a plurality of frictional engaging elements (C1, C2, C3, C4R) installed in the
transmission; a hydraulic pressure supplying circuit (O) for discharging hydraulic fluid (ATF) from
one of said plurality of frictional engaging elements and for supplying hydraulic fluid to
another one of said plurality of frictional engaging elements to bring said one and another
one of said plurality of frictional engaging elements into operation such that gear-shift is
effected in the transmission; characterized in that: coolant temperature detecting means (S7) for detecting a coolant temperature (Tw) of
the engine; first heat quantity calculating means (S16) for calculating a heat quantity generated by
the hydraulic coupling means (ΔTtr); second heat quantity calculating means (S18, S102) for calculating a heat quantity
generated by at least one of the frictional engaging elements at gear-shift (ΔTcl(No)); third heat quantity calculating means (S20) for calculating a heat quantity generated by
stirring of the hydraulic fluid (ΔTst); fourth heat quantity calculating means (S22) for calculating a heat quantity generated or
absorbed at a heat exchanger which exchanges heat from the fluid (ΔTra); and temperature estimating means (S26, S28) for estimating a temperature of at least one of
the frictional engaging elements (Tcl(No)) based on the detected engine coolant temperature
(Tw) and the calculated heat quantities (ΔTtr, ΔTcl(No), ΔTst, ΔTra) calculated by the
first, second, third and fourth heat quantity calculating means.
Claim 3
Dependent Claim
109 words
A system according to claim 1, wherein the hydraulic coupling
means is a hydraulic torque converter, and said first heat quantity means comprising: input rotational speed detecting means (S9) for detecting an input rotational speed of an
input member of the torque converter; output rotational speed detecting means (S3) for detecting an output rotational speed of
an output member of the torque converter; and heat quantity estimating means (S16) for calculating the heat quantity generated by the
hydraulic torque converter (ΔTtr) based on at least the detected input and output rotational
speeds of the torque converter, an efficiency of the torque converter (η) and a pump
absorption torque coefficient(τ).
Claim 4
Dependent Claim
109 words
A system according to claim 2, wherein the hydraulic coupling
means is a hydraulic torque converter, and said first heat quantity means comprising: input rotational speed detecting means (S9) for detecting an input rotational speed of an
input member of the torque converter; output rotational speed detecting means (S3) for detecting an output rotational speed of
an output member of the torque converter; and heat quantity estimating means (S16) for calculating the heat quantity generated by the
hydraulic torque converter (ΔTtr) based on at least the detected input and output rotational
speeds of the torque converter, an efficiency of the torque converter (η) and a pump
absorption torque coefficient(τ).
Claim 5
Dependent Claim
30 words
A system according to claim 2, wherein said second heat quantity
calculating means calculates the heat quantity generated by at least one of the frictional
engaging elements at an upshift.
Claim 6
Dependent Claim
74 words
A system according to claim 1, wherein said second heat quantity
calculating means comprising; gear determining means (S104) for determining gears to be shifted from and to be
shifted to; engine speed detecting means for detecting a speed of the engine (Ne); and heat quantity estimating means (S104) for calculating the heat quantity generated by at
least one of the frictional engaging elements (ΔTcl(No)) based on at least the detected gears
and engine speed.
Claim 7
Dependent Claim
28 words
A system according to claim 6, wherein the at least one of the
frictional engaging elements is the frictional engaging element for the gear to be shifted to.
Claim 8
Dependent Claim
74 words
A system according to claim 2, wherein said second heat quantity
calculating means comprising; gear determining means (S104) for determining gears to be shifted from and to be
shifted to; engine speed detecting means for detecting a speed of the engine (Ne); and heat quantity estimating means (S104) for calculating the heat quantity generated by at
least one of the frictional engaging elements (ΔTcl(No)) based on at least the detected gears
and engine speed.
Claim 9
Dependent Claim
28 words
A system according to claim 8, wherein the at least one of the
frictional engaging elements is the frictional engaging element for the gear to be shifted to.
Claim 10
Dependent Claim
56 words
A system according to claim 2, wherein said third heat quantity
calculating means comprising; vehicle speed detecting means (S2) for detecting a traveling speed of the vehicle (V);
and heat quantity estimating means (S20) for calculating the heat quantity generated by
stirring of the hydraulic fluid (ΔTst) based on at least the detected vehicle traveling speed.
Claim 11
Dependent Claim
77 words
A system according to claim 2, wherein said fourth heat quantity
calculating means calculates the heat quantity generated or absorbed at the heat exchanger
cyclically, and comprising: heat quantity estimating means (S22) for calculating the heat quantity generated or
absorbed at the heat exchanger (ΔTra) based on at least a difference between the heat
quantity generated by at least one of the frictional engaging elements and estimated in a
preceding cycle and the detected engine coolant temperature.
Claim 12
Dependent Claim
68 words
A system according to claim 2, further comprising: fifth heat quantity calculating means (S24) for calculating a heat quantity relative to
ambient air (ΔTta) cyclically; and said temperature estimating means for estimating a
temperature of at least one of the frictional engaging elements based on the detected engine
coolant temperature and the calculated heat quantities calculated by the first, second, third,
fourth and fifth heat quantity calculating means.
Claim 13
Dependent Claim
74 words
A system according to claim 12, wherein said fifth heat quantity
calculating means comprising; ambient air temperature detecting means (S8) for detecting an ambient air temperature;
and heat quantity estimating means (S24) for calculating the heat quantity relative to
ambient air (ΔTta) based on at least a difference between the heat quantity generated by at
least one of the frictional engaging elements and estimated in a preceding cycle and the
detected ambient air temperature.
Claim 14
Dependent Claim
55 words
A system according to claim 13, wherein said fifth heat quantity
calculating means further comprising; vehicle speed detecting means (S2) for detecting a traveling speed of the vehicle; and said heat quantity estimating means calculates the heat quantity relative to ambient air
(ΔTta) based on at least the difference and the detected vehicle traveling speed.
References Cited (Backward Citations)
JPS6263248A
Cited
JPH0768756A
Cited
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