Patent EP0137247B1 successfully refreshed from Google Patents.
EP0137247B1
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EP
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Device for preventing overheating of a clutch
Assignee: Wabco Westinghouse Fahrzeugbremsen GmbH
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Filing: 1984-08-22
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Granted: 1990-01-17
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Expires: 2004-08-22
Abstract
No abstract record available.
Inventors
- 👤 Westinghouse Fahrzeugbremsen Gmbh Wabco
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 20:20
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/02; B60W30/00; B60W30/18; B60W30/1819; B60W30/184; B60W30/186; F; F16; F16D; F16D48/00; F16D48/06; F16D48/064; B60W50/00; B60W50/08; B60W50/14; B60W2050/143; B60W2510/00; B60W2510/02; B60W2510/0241; B60W2510/06; B60W2510/0638; B60W2540/00; B60W2540/10; B60W2710/00; B60W2710/02; B60W2710/021; B60W2710/023; F16D2500/00; F16D2500/30; F16D2500/304; F16D2500/30406; F16D2500/3041; F16D2500/30412; F16D2500/30415; F16D2500/3042; F16D2500/30426; F16D2500/306; F16D2500/3065; F16D2500/31; F16D2500/3107; F16D2500/3114; F16D2500/3115; F16D2500/312; F16D2500/3125; F16D2500/3127; F16D2500/316; F16D2500/3166; F16D2500/50; F16D2500/51; F16D2500/5104; F16D2500/5106; F16D2500/70; F16D2500/702; F16D2500/70252; F16D2500/706; F16D2500/70605; F16D2500/70668; F16D2500/71; F16D2500/7101; F16D2500/7103
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
132 words
A device for protecting a clutch against overheating which is arranged between an internal combustion engine and gears, characterized by: a) a driving torque-determining device (18) for determining the coupling torque or driving torque to be transmitted by the clutch; b) a slip-determining device (28) that determines the slip between clutch input speed and clutch output speed; c) a computing device (30) forming the product of the determined coupling or driving torque to be transmitted and the slip; d) a monitoring device (31) which apportions the values of the product of the coupling torque to be transmitted and slip warning rest periods and compares the actual slip time in each case with the warning rest periods and produces a warning signal when the warning rest periods are exceeded by the slip times.
Claim 2
Independent Claim
132 words
A device for protecting a clutch against overheating which is arranged between an internal combustion engine and gears, characterized by: a) a driving torque-determining device (18) for determining the coupling torque or driving torque to be transmitted by the clutch; b) a slip-determining device (28) that determines the slip between clutch input speed and clutch output speed; c) a computing device (30) forming the product of the determined coupling or driving torque to be transmitted and the slip; d) a monitoring device (31) which apportions the values of the product of the coupling torque to be transmitted and slip warning rest periods and compares the actual slip time in each case with the warning rest periods and produces a warning signal when the warning rest periods are exceeded by the slip times.
Claim 3
Dependent Claim
55 words
A device according to claim 1, characterized in that the coupling or driving torque to be transmitted is determined from the engine driving torque measured at the engine (2) or from a driving torque measured at or behind the gears (10) which has been converted by means of any transmission ratios that may be available.
Claim 4
Dependent Claim
43 words
A device according to claim 1, characterized in that the coupling or driving torque to be transmitted is the engine driving torque determined from the engine control signals of a transmitter or of an engine control device (16) and from the engine speeds.
Claim 5
Dependent Claim
24 words
A device according to claim 1, characterized in that the coupling torque is the steady driving torque for steady drive on the particular roadway.
Claim 6
Dependent Claim
42 words
A device according to claim 4, characterized in that the steady driving torque determined most recently in each case is used, for example the steady driving torque associated with the particular incline and with the weight of the vehicle (e.g. before braking).
Claim 7
Independent Claim
66 words
A device according to any one of claims 1 to 5, characterized in that there are provided a first shaft encoder (20) recording the speed at the input side of the clutch (6) and a second shaft encoder (22) recording the speed at the output side of the clutch, the speed-signals of which shaft encoders are fed to a differential stage of the slip-determining device (28).
Claim 8
Dependent Claim
36 words
A device according to claim 6, characterized in that the speed determined with the second sensor (22) at the power-output side of the gears is adjusted by the transmission ratio of the gears in each case.
Claim 9
Independent Claim
86 words
A device according to any one of claims 1 to 7, characterized in that the warning rest period is determined or calculated from the equation in which E 1 is an upper, pre-determined limit energy, M is the engine driving torque or starting torque, ωMot is the angular velocity of the engine and ωG is the angular velocity of the clutch (6) at the power-output side or the angular velocity of the gears (10) at the power-output side adjusted by the transmission ratio of the gears.
Claim 10
Independent Claim
57 words
A device according to any one of claims 1 to 7, characterized in that the warning rest period is determined in such a manner that times t of differing durations are apportioned to varying values of the product of M · (ω Mot - wG) in a table of a memory (32) of the monitoring device (31).
Claim 11
Dependent Claim
31 words
A device according to claim 9, characterized in that decreasing warning rest periods t are associated with the values of increasing size arising from the product of M · (ωMot ―ωG).
Claim 12
Dependent Claim
35 words
A device according to claim 9, characterized in that progressively decreasing warning rest periods t are associated with the values of increasing size arising from the product of M . (ωMot - ω G ).
Claim 13
Independent Claim
41 words
A device according to any one of claims 1 to 11, characterized in that in each case two different successive warning rest periods ti, t 2 are associated with the values arising from the product of M · (ωMot - ωG).
Claim 14
Dependent Claim
35 words
A device according to claim 12, characterized in that upon expiry of the first warning rest period t 1 , a warning device (38) is actuated which produces a warning signal audible to the driver.
Claim 15
Dependent Claim
41 words
A device according to claim 12, characterized in that upon expiry of the second warning rest period t 2 , a device (40) for slow, steady engaging of the clutch (6) and for corresponding control of the transmitter (16) is actuated.
Claim 16
Independent Claim
43 words
A device according to any one of claims 1 to 14, characterized in that the slip times determined in each case are recorded in a memory (36) which adds these slip times to the slip times determined in preceding monitored clutch slipping actions.
Claim 17
Dependent Claim
37 words
A device according to claim 15, characterized in that the slip time stored in the memory (36) is reduced continuously or stepwise according to a given function corresponding to the particular progress of the clutch cooling time.
Claim 18
Independent Claim
57 words
A device according to any one of claims 1 to 16, characterized in that the actual slip time ta in the memory (36) is compared in a comparator (34) with the warning rest periods t l x and t 2 x allocated in the monitoring device (31) to the particular friction power M · (ωMot- ωG) determined.
Claim 19
Dependent Claim
66 words
A device according to claim 17, characterized in that the comparator (34) actuates an audible or visual warning device (38) when the slip time t a exceeds the first warning rest period t lx , and actuates a clutch control device (40) for the slow, steady engaging of the clutch (6) when the slip time t a exceeds the second warning rest period t 2 x.
Claim 20
Dependent Claim
43 words
A device according to claim 17, characterized in that the output signal of the clutch control device (40) controls the transmitter (16) in accordance with the slow, steady engaging of the clutch (6) in such a manner that no decrease in speed occurs.
Claim 21
Independent Claim
26 words
A device according to any one of the preceding claims, characterized in that at least one microcomputer is used to carry out the operations and calculations.
References Cited (Backward Citations)
DE3206593A1
Cited
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