Method and apparatus for controlling a brake valve based on sensed conditions and a model of the braking system
First Claim
1. A process for operating a compressed air brake having an electropneumatic brake valve with an actuator to adjust a setpoint (UREF) for the brake pressure, a relay valve attached to a main air pipe (HL), operated by a pilot control pressure from said brake valve, at least two air supply containers attached to the main air pipe (HL), and a first and a second sensor for measuring the volume of air fed into the main pipe and for measuring the air pressure in the main pipe, comprising the following steps:
- (a) measuring the volume of the air (Σ
V) fed into the main air pipe (HL) when releasing the brake and generating a first air volume signal in response thereto;
(b) measuring the air pressure (HList) in the main air pipe (HL) and generating a main air pipe air pressure signal in response thereto;
(c) modifying the pilot control pressure (A-pressure) in response to the first air volume signal and the main air pipe air pressure signal;
(d) generating electric simulation signals, which simulate the change in pressure over time of at least the main air pipe pressure (HLm) and a pressure (Rm) in said air supply containers on the basis of a predetermined function of said first air volume signal and said main air pipe air pressure signal (HList);
(e) generating an electric air backfeed signal (VSZUG), which corresponds to the volume of air still to be backfed during a brake releasing process on the basis of said electric simulation signals representing a change in main air pipe pressure and air supply container pressures (HLm and Rm), of a reference signal (UREF) derived from the actuator and of stored value signals (AHL, AR), which correspond to an assumed volume of air in the main air pipe and the air supply container;
(f) generating a correction value signal (UBER), which determines an amount by which the pilot control pressure set to release the brake is to be increased, on the basis of the electric backfeed signal (VSZUG);
(g) comparing said first air volume signal and said electric air backfeed signal; and
,(h) correcting said stored value signals (AHL, AR) if said first air volume signal and electric air backfeed signal are not the same.
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Accused Products
Abstract
The electronic brake control simulates by electronic means various real changes over time of the pneumatic pressures in a braking system, in particular the pressure in the main air pipe of the train, the pressure in the R containers of the individual wagons and the pressure in the individual brake cylinders. When the brakes are released, the values are determined from these model values and the actually backfed air volume, from which values the pilot control pressure for a relay valve can be increased in order to release the brakes more rapidly. The train model determines, by an adaptive learning method at the end of a brake releasing process, values for the volume of the main air pipe and the R containers of the train, so that the train model adapts itself to the actually existing train.
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Citations
15 Claims
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1. A process for operating a compressed air brake having an electropneumatic brake valve with an actuator to adjust a setpoint (UREF) for the brake pressure, a relay valve attached to a main air pipe (HL), operated by a pilot control pressure from said brake valve, at least two air supply containers attached to the main air pipe (HL), and a first and a second sensor for measuring the volume of air fed into the main pipe and for measuring the air pressure in the main pipe, comprising the following steps:
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(a) measuring the volume of the air (Σ
V) fed into the main air pipe (HL) when releasing the brake and generating a first air volume signal in response thereto;(b) measuring the air pressure (HList) in the main air pipe (HL) and generating a main air pipe air pressure signal in response thereto; (c) modifying the pilot control pressure (A-pressure) in response to the first air volume signal and the main air pipe air pressure signal; (d) generating electric simulation signals, which simulate the change in pressure over time of at least the main air pipe pressure (HLm) and a pressure (Rm) in said air supply containers on the basis of a predetermined function of said first air volume signal and said main air pipe air pressure signal (HList); (e) generating an electric air backfeed signal (VSZUG), which corresponds to the volume of air still to be backfed during a brake releasing process on the basis of said electric simulation signals representing a change in main air pipe pressure and air supply container pressures (HLm and Rm), of a reference signal (UREF) derived from the actuator and of stored value signals (AHL, AR), which correspond to an assumed volume of air in the main air pipe and the air supply container; (f) generating a correction value signal (UBER), which determines an amount by which the pilot control pressure set to release the brake is to be increased, on the basis of the electric backfeed signal (VSZUG); (g) comparing said first air volume signal and said electric air backfeed signal; and
,(h) correcting said stored value signals (AHL, AR) if said first air volume signal and electric air backfeed signal are not the same. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Adaptive air brake control apparatus comprising an electropneumatic brake valve with an actuator to adjust a brake pressure setpoint, including:
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a main air pipe; a relay valve attached thereto; at least two air supply containers attached to said main air pipe; a first sensor for measuring the air volume fed into said main air pipe when releasing the brake; and
,a second sensor for measuring the air pressure in said main air pipe, said electropneumatic brake valve producing a pilot control pressure for controlling said relay valve and said air brake control apparatus modifying said pilot control pressure in response to output signals of both of said sensors; further comprising; (a) electronic train simulation means generating electrical signals which simulate the change in pressure over time of at least the main air pipe pressure and the pressure in the air supply containers on the basis of a predetermined function of the output signals of the sensors; (b) memory means storing values which correspond to an assumed volume of air in the main air pipe and the volume of air in said air supply containers; (c) calculating means which generate a signal which corresponds to the volume of air to be backfed during a brake release process on the basis of the electric simulation signals and said values stored in said memory means; (d) correction means which determines an amount signal by which the pilot control pressure to release the brake is to be increased on the basis of the signal from said calculating means; (e) comparison means which following a brake release compares the value of the measured backfed volume and the value of the said volume of air to be backfed; and
,(f) learning means which, in dependence on an output signal from said comparing means, modifies the stored values in said memory means
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Specification