Method for the surveillance of a brake device in regard to overload
First Claim
1. A method for the surveillance of a brake device relating to overload, where the brake device includes a wear readjustment device, is actuatable by a pressure p, and where the brake device reaches a load limit in a brake actuation, when a selected device component, which is deformed in a brake application, is warmed to a permissible temperature T, wherein(a) in a preliminary step the selected device component is warmed to said permissible temperature T,(b) in said preliminary step a characterizing curve of a value h measured versus pressure, is determined for the selected device component warmed to said temperature T, wherein the value h represents the deformation of the device component, said characterizing curve being designated as deformation characterizing curve h=f.sub.(p,T),(c) in a brake actuation, the value hist, representing a deformation occurring of the selected device component of the value h, and the existing pressure pist are measured.(d) a warning signal is furnished if a point defined by the value hist and the pressure pist reaches the deformation characterizing curve h=f.sub.(p,T) or exceeds the deformation characterizing curve h=f.sub.(p,T) in a direction of higher values of the value h.
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Accused Products
Abstract
A method for the surveillance of a brake device includes an indirect measurement of temperature of a selected device component, for example a brake drum, of a brake device. A warning signal is furnished, if this measured temperature reaches a maximum permissible value. The invention method is quick by employing the pressure-dependent deformation characterizing curve (11) of the device component heated to the permissible temperature. The device component represented by the brake drum (1) can heat to the maximum permissible temperature and is placed under surveillance during a brake actuation based on deformation and pressure measurement. It is then determined if the actual values reach or exceed the deformation characterizing curve (11). The invention apparatus is used in connection with brake devices in vehicles.
19 Citations
15 Claims
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1. A method for the surveillance of a brake device relating to overload, where the brake device includes a wear readjustment device, is actuatable by a pressure p, and where the brake device reaches a load limit in a brake actuation, when a selected device component, which is deformed in a brake application, is warmed to a permissible temperature T, wherein
(a) in a preliminary step the selected device component is warmed to said permissible temperature T, (b) in said preliminary step a characterizing curve of a value h measured versus pressure, is determined for the selected device component warmed to said temperature T, wherein the value h represents the deformation of the device component, said characterizing curve being designated as deformation characterizing curve h=f.sub.(p,T), (c) in a brake actuation, the value hist, representing a deformation occurring of the selected device component of the value h, and the existing pressure pist are measured. (d) a warning signal is furnished if a point defined by the value hist and the pressure pist reaches the deformation characterizing curve h=f.sub.(p,T) or exceeds the deformation characterizing curve h=f.sub.(p,T) in a direction of higher values of the value h.
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5. An apparatus for the surveillance of a brake device relating to overload, wherein the brake device includes a wear readjustment device, wherein the brake device is actuatable by a pressure p, and wherein the brake device reaches a load limit in a brake actuation, when a selected device component, which is deformed in a brake application, is warmed to a permissible temperature T, wherein
a) a deformation sensor is furnished for capturing the value hist and for transforming the captured value into an electrical deformation signal, b) a pressure sensor is furnished for capturing the existing pressure pist and for transforming the captured value into an electrical pressure signal, c) an evaluation electronics is furnished for receiving the deformation signal and the pressure signal, d) a deformation characterizing curve h=f.sub.(p,T) measured versus pressure is stored in the evaluation electronics, e) the evaluation electronics is formed for comparing the value hist with the value h.sub.(pist,T) of the deformation characterizing curve h=f.sub.(p,T) coordinated to the existing pressure pist, and for furnishing a warning signal if the value hist is equal to or larger than the value h(pist,T).
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8. An apparatus for the surveillance of a brake device relating to overload wherein the brake device includes a wear readjustment device comprising
a selected device component for being subject to a deformation during a brake application; -
a deformation sensor engaging the selected device component for sensing a deformation value hist of the selected device component and for delivering an electrical deformation signal corresponding to the value sensed; a pressure sensor for sensing an actual pressure pist employed in brake actuation and for delivering an electrical pressure signal corresponding to the pressure value sensed; an evaluation electronics having a first input connected to the deformation sensor for receiving the electrical deformation signal, having a second input connected to the pressure sensor for receiving the electrical pressure signal and having an output, wherein said evaluation electronics incorporates a memory storage for storing a deformation characterizing curve h=f.sub.(p,T) representing deformation values measured versus pressure at a maximum permissible deformation temperature T, wherein said evaluation electronics further incorporates a means for comparing the value hist with the value on the deformation characterizing curve h=f(p,T) for the actual pressure Pist, and wherein said output furnishes a warning signal if the value hist is equal to or larger than said value h.sub.(p,T) on the deformation characterizing curve for Pist. - View Dependent Claims (9, 10, 12, 13)
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11. A method for the surveillance of a brake device relating to overload, wherein the brake device includes a wear readjustment device, and wherein the brake device is actuatable by a pressure p, and wherein the brake device reaches a load limit in a brake actuation determinable by a maximum permissible temperature T of a selected device component, comprising the steps:
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warming the selected device component to the maximum permissible temperature T in a preliminary step; measuring a deformation h of the selected device component at said maximum permissible temperature T in said preliminary step depending on application of a pressure p to said selected device component for obtaining a deformation characterizing curve h=f(p,T) for said maximum permissible temperature T; applying a pressure pist during a brake actuation to the selected device component; measuring a deformation value hist representing a deformation experienced by the selected device component upon application of the pressure pist ; comparing the value hist with the value on the curve h=f(p,T) at Pist ; delivering a warning signal if the value hist is equal to or larger than said value on the curve f(p,T) at pist. - View Dependent Claims (14, 15)
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Specification