Device for monitoring a friction clutch
First Claim
1. A device for the monitoring of a friction clutch, particularly an automatized friction clutch of a motor vehicle, comprisinga) torque detection means for detecting data which represent at least approximatively the instantaneous torque developing at the clutch (5);
- b) rotational speed sensors (25,
27) which supply data corresponding to the instantaneous input rotational speed of the clutch (5) and to the instantaneous output rotational speed of the clutch (5);
c) a temperature sensor (35) which detects the temperature of a component (37) of the clutch (5);
d) computer means (23) which, depending on the data of said torque detection means and of said rotational speed sensors (25,
27), compute successively with a predetermined time period data which represent at least approximately the instantaneous frictional performance of the clutch (5), and which adds up the frictional performance data for the determination of several frictional work mean values over several time intervals of different durations, wherein said computer means (23) compares the frictional work mean values each being determined in an individual one of said time intervals with the predetermined limit values associated with said time intervals and, in the event of the individual limit values being exceeded, produces exceed-indicating signals,wherein a plurality of limit values is associated with each of said frictional work mean values, the magnitude of said limit values being a function of the clutch temperature, and wherein said computer means (23) produces said exceed-indicating signals depending on the clutch temperature detected and on the limit values predetermined for the detected clutch temperature.
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Accused Products
Abstract
For the protection of an automatized friction clutch of a motor vehicle it is proposed, by means of a computer device (23) to compute periodically data for the instantaneous friction performance of the clutch (5) and to add them up in several also periodically actualized time window stores. The time window stores have different time windows and correspondingly store a range of friction work mean values. Associated with the individual time window stores are respectively several limit values, the magnitude is additionally a function of the air temperature of a clutch casing (37) surrounding the clutch (5). A computer device (23), depending upon the temperature measured by means of a temperature sensor (35) and upon the limit values ruling for this temperature, institutes graded protective measures. For safety reasons, none of the protective measures completely prevents the operativeness of the clutch (5). As the heat loading of the clutch (5) increases only the clutch comfort is increasingly reduced, and as the maximum loading limit is approached, active comfort-impairing measures, such as, e.g., oscillations of a regulating drive (19) of the clutch (5) causing "grab" of the clutch (5), are brought about.
25 Citations
17 Claims
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1. A device for the monitoring of a friction clutch, particularly an automatized friction clutch of a motor vehicle, comprising
a) torque detection means for detecting data which represent at least approximatively the instantaneous torque developing at the clutch (5); -
b) rotational speed sensors (25,
27) which supply data corresponding to the instantaneous input rotational speed of the clutch (5) and to the instantaneous output rotational speed of the clutch (5);c) a temperature sensor (35) which detects the temperature of a component (37) of the clutch (5); d) computer means (23) which, depending on the data of said torque detection means and of said rotational speed sensors (25,
27), compute successively with a predetermined time period data which represent at least approximately the instantaneous frictional performance of the clutch (5), and which adds up the frictional performance data for the determination of several frictional work mean values over several time intervals of different durations, wherein said computer means (23) compares the frictional work mean values each being determined in an individual one of said time intervals with the predetermined limit values associated with said time intervals and, in the event of the individual limit values being exceeded, produces exceed-indicating signals,wherein a plurality of limit values is associated with each of said frictional work mean values, the magnitude of said limit values being a function of the clutch temperature, and wherein said computer means (23) produces said exceed-indicating signals depending on the clutch temperature detected and on the limit values predetermined for the detected clutch temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A device for the monitoring of an automatized friction clutch (5) of a motor vehicle which can be engaged or released by means of a servomotor (19) and of a control (23) governing the servomotor (19) dependent upon the engine rotational speed detected by means of a rotational speed sensor (25), comprising computer means detecting the instantaneous friction performance of the clutch (5) and summating over several time intervals of different duration for the formation of several frictional work mean values, which computer means compare the frictional work mean values with several limit values individually associated with the time intervals, and, when the limit values are exceeded, produces exceed-indicating signals influencing the clutch engagement and/or clutch release characteristic of the control (23), wherein the limit values associated with the time intervals have stepped values, wherein said computer means, on exceeding at least one first limit value, produce at least one first exceed-indicating signal which increases the clutch actuation rate of the servomotor (29) established by the control (23) and/or reduce a clutch slip of predetermined magnitude allowed by the control (23) for the reduction of rotary oscillation, and on exceeding a second limit value higher than said first limit value produce a second exceed-indicating signal which, additionally to the measures provided by each first exceed-indicating signal cause the control (23) to effect an oscillating regulating movement of the regulating drive (19) and/or to issue a warning signal (39).
Specification