EP0140861A2
Expired / Lapsed
EP
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Electronic sensor for brake systems in vehicles
Assignee: Individual
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Filing: 1984-10-29
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Granted: —
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Expires: 2004-10-29
Abstract
Abstract The invention relates to an electronic sensor for determining the start time and duration of the brake relief phase in brake force modulation cycles in vehicles with so-called anti-lock brake systems. A tachometer (10) detects the rotation speed of the wheels. The output signal of the tachometer is differentiated in a differentiating circuit (20) and is compared to a reference signal (a o ) from a reference value generator (30). A switch (60) is switched-on by the output signal from the comparator (40) when the differentiated signal has reached the reference value. Thereby a break force reduction phase of the brake force modulator (80) is started. A reference and sampling circuit (50) stores the instantaneous speed signal (w(t)) from the tachometer (10) and samples the instantaneous value (w(t o )) of this signal at that point in time when the differentiated signal (a(t)) has reached the reference value (a o ). The reference and sampling circuit (50) also provides a reference signal (M) representing a reference speed that is supplied to one input of a second comparator (70) and in this comparator is compared to the speed signal (w(t)) from the tachometer (10). The output signal of the second comparator (70) switches off the switch (60) when the speed signal (w(t)) from the tachometer (10) has reached the speed reference signal level (M). Thereby the switch (60) switches off the modulation system (80) and once again lets through the signal (w(t)) to the sampling circuit. The slope of the reference signal (M) is controlled by the modulated brake force.
Inventors
- 👤 Folke Ivar Blomberg
- 👤 Jan-Olov Martin Holst
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 05:11
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/171
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
306 words
Electronic sensor for determining the start time and duration of the brake relief phase in brake force modulation cycles in vehicles with so-called anti-lock brake systems, comprising a tacho-meter (10) for detecting a quantity representing the speed of at least one wheel, a differentiating circuit (20) for time differentiation of the speed signal (w(t)) from the tachometer (10), a comparator (40) to compare the differentiated signal from the differentiating circuit (20) with a reference signal (a 0 ) from a reference value generator (30), a switch (60) that is switched-on by the output signal from the comparator (40) when the differentiated signal (a(t)) has reached the reference value (a 0 ), whereby a brake relief phase is started by the brake force modulator (80), a reference and sampling circuit (50) for storing the instantaneous speed signal (w(t)) from the tachometer (10) and sampling the instantaneous value (w(t o )) of this signal at that point in time when the differentiated signal (a(t)) has reached the reference value (a 0 ) and for providing a reference signal (M) representing a reference speed that is supplied to one input of a second comparator (70) and in this comparator is compared to the speed signal (w(t)) from the tachometer (10), the output signal of the second comparator (70) switching-off the switch (60) when the speed signal (w(t)) from the tachometer (10) has reached to the speed reference signal level (M), whereby the switch (60) switches-off the brake force modulator (80) and once again lets through the signal (w(t)) to the sampling circuit (50), characterized in a device for sensing the modulated brake force during the relief phase for feeding back this brake force to the reference and sampling circuit (50) for adjusting the degree with which the speed reference signal (M) varies in dependence of the modulated brake force.
Claim 2
Dependent Claim
306 words
Electronic sensor for determining the start time and duration of the brake relief phase in brake force modulation cycles in vehicles with so-called anti-lock brake systems, comprising a tacho-meter (10) for detecting a quantity representing the speed of at least one wheel, a differentiating circuit (20) for time differentiation of the speed signal (w(t)) from the tachometer (10), a comparator (40) to compare the differentiated signal from the differentiating circuit (20) with a reference signal (a 0 ) from a reference value generator (30), a switch (60) that is switched-on by the output signal from the comparator (40) when the differentiated signal (a(t)) has reached the reference value (a 0 ), whereby a brake relief phase is started by the brake force modulator (80), a reference and sampling circuit (50) for storing the instantaneous speed signal (w(t)) from the tachometer (10) and sampling the instantaneous value (w(t o )) of this signal at that point in time when the differentiated signal (a(t)) has reached the reference value (a 0 ) and for providing a reference signal (M) representing a reference speed that is supplied to one input of a second comparator (70) and in this comparator is compared to the speed signal (w(t)) from the tachometer (10), the output signal of the second comparator (70) switching-off the switch (60) when the speed signal (w(t)) from the tachometer (10) has reached to the speed reference signal level (M), whereby the switch (60) switches-off the brake force modulator (80) and once again lets through the signal (w(t)) to the sampling circuit (50), characterized in a device for sensing the modulated brake force during the relief phase for feeding back this brake force to the reference and sampling circuit (50) for adjusting the degree with which the speed reference signal (M) varies in dependence of the modulated brake force.
Claim 3
Dependent Claim
290 words
Electronic sensor for determining the start time and duration of the brake relief phase in brake force modulation cycles in vehicles with so-called anti-lock brake systems, comprising a tachometer (10) for detecting a quantity representing the speed of at least one wheel, a threshold value generator (20; Fig. 6, 9) for sensing a quantity representing wheel retardation and providing an output signal when this exceeds a reference retardation (a o ), a switch (60) that is switched-on by the output signal from the threshold value generator (20) when the wheel retardation (a(t)) has reached the reference value (a 0 ), whereby a brake relief phase is started by the brake force modulator (80), a reference and sampling circuit (50) for storing the instantaneous velocity signal (w(t)) from the tacho-meter (10) and sampling of the instantaneous value (w(t o )) of this signal at that point in time when the wheel retardation (a(t)) has reached the reference value (a 0 ) and for providing a reference signal (M) representing a reference speed that is supplied to one input of a comparator (70) and in this comparator is compared to the speed signal (w(t)) from the tachometer (10), the output signal of the comparator (70) switching-off the switch (60) when the speed signal (w(t)) from the tachometer (10) has reached the speed reference signal level (M), whereby the switch (60) switches off the brake force modulator (80) and once again lets through the signal (w(t)) to the sampling circuit (50), characterized in a device for sensing the modulated brake force during the relief phase for feeding back this brake force to a variable drive (90) connected between wheel and tachometer for adjusting the gear change in dependence of the modulated brake force.
Claim 4
Dependent Claim
290 words
Electronic sensor for determining the start time and duration of the brake relief phase in brake force modulation cycles in vehicles with so-called anti-lock brake systems, comprising a tachometer (10) for detecting a quantity representing the speed of at least one wheel, a threshold value generator (20; Fig. 6, 9) for sensing a quantity representing wheel retardation and providing an output signal when this exceeds a reference retardation (a o ), a switch (60) that is switched-on by the output signal from the threshold value generator (20) when the wheel retardation (a(t)) has reached the reference value (a 0 ), whereby a brake relief phase is started by the brake force modulator (80), a reference and sampling circuit (50) for storing the instantaneous velocity signal (w(t)) from the tacho-meter (10) and sampling of the instantaneous value (w(t o )) of this signal at that point in time when the wheel retardation (a(t)) has reached the reference value (a 0 ) and for providing a reference signal (M) representing a reference speed that is supplied to one input of a comparator (70) and in this comparator is compared to the speed signal (w(t)) from the tachometer (10), the output signal of the comparator (70) switching-off the switch (60) when the speed signal (w(t)) from the tachometer (10) has reached the speed reference signal level (M), whereby the switch (60) switches off the brake force modulator (80) and once again lets through the signal (w(t)) to the sampling circuit (50), characterized in a device for sensing the modulated brake force during the relief phase for feeding back this brake force to a variable drive (90) connected between wheel and tachometer for adjusting the gear change in dependence of the modulated brake force.
Claim 5
Dependent Claim
195 words
Electronic sensor for determining the start time and duration of the brake relief phase in brake force modulation cycles in vehicles with so-called anti-lock brake systems, characterized in a tacho- meter (10) for detecting a quantity representing the speed of at least one wheel, a reference and sampling circuit for storing the instantaneous speed signal from the tachometer and sampling the instantaneous value of this signal when a brake force is first applied and for providing a reference signal representing a reference speed that is supplied to one input of a comparator and in this comparator is compared to the speed signal from the tachometer, a switch that is switched-on by the output signal from the comparator when the tachometer signal falls below the reference signal, whereby a brake relief phase is started by the brake force modulator, and that is switched-off when the speed signal from the tachometer once again reaches the speed signal, and in a device for sensing the applied brake force for feeding back this brake force to the reference and sampling circuit for adjusting the degree with which the speed reference signal decreases in dependence of the modulated brake force.
Claim 6
Dependent Claim
195 words
Electronic sensor for determining the start time and duration of the brake relief phase in brake force modulation cycles in vehicles with so-called anti-lock brake systems, characterized in a tacho- meter (10) for detecting a quantity representing the speed of at least one wheel, a reference and sampling circuit for storing the instantaneous speed signal from the tachometer and sampling the instantaneous value of this signal when a brake force is first applied and for providing a reference signal representing a reference speed that is supplied to one input of a comparator and in this comparator is compared to the speed signal from the tachometer, a switch that is switched-on by the output signal from the comparator when the tachometer signal falls below the reference signal, whereby a brake relief phase is started by the brake force modulator, and that is switched-off when the speed signal from the tachometer once again reaches the speed signal, and in a device for sensing the applied brake force for feeding back this brake force to the reference and sampling circuit for adjusting the degree with which the speed reference signal decreases in dependence of the modulated brake force.
Claim 7
Dependent Claim
40 words
Electronic sensor in accordance with claim 1 or 2, characterized in that the modulated brake force is fed back to the reference value generator (30) for adjusting the reference value (a 0 ) in dependence of the applied brake force.
Claim 8
Dependent Claim
26 words
Electronic sensor in accordance with one of the preceding claims, characterized in that the modulated brake pressure is sensed in a hydraulic or pneumatic brake system.
Claim 9
Dependent Claim
28 words
Electronic sensor in accordance with one of the preceding claims, characterized in that the reference and sampling circuit (50) comprises a capacitor for storing the speed signal (w(t)).
Claim 10
Dependent Claim
33 words
Electronic sensor in accordance with claim 6, characterized in that the capacitor in the brake relief phase is discharged over a resistor, resistance of the resistor being controlled by the modulated brake force.
Claim 11
Dependent Claim
26 words
Electronic sensor in accordance with claim 6, characterized in that the capacitor is discharged with a current, the current strength depending on the modulated brake force.
Claim 12
Dependent Claim
49 words
Electronic sensor in accordance with any of claims 2, 4 - 8, characterized in that the threshold value generator (20) comprises a mechanical retardation sensor comprising a flywheel and a spring forming the reference value generator and which after exceeding a reference retardation (a 0 ) closes a switch.
Claim 13
Dependent Claim
36 words
Electronic sensor in accordance with any of claims 4 to 9, characterized in that the vehicle load is detected and fed back for adjusting the reference value (a o ) in dependence of the wheel load.
References Cited (Backward Citations)
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