| 摘要 |
<p>A radio controlled remote brake system for a railway train having a caboose equipped with a motor driven pressure regulating valve device and an equalizing reservoir that is charged from the train brake pipe pressure via the regulating valve device. When a brake application is made at the locomotive by operating the conventional engineer's brake valve device, a radio signal corresponding to the brake valve position is transmitted to the caboose where it is compared with a feedback signal corresponding to the instantaneous position in which the caboose regulating valve is set by its drive motor. When the brake control and feedback signals match, the caboose regulating valve is set to effect a reduction of the caboose equalizing reservoir pressure in accordance with the locomotive equalizing reservoir pressure reduction resulting from operation of the engineer's brake valve device. During brake release and charging, an initialization circuit controls the regulating valve drive motor so that the regulating valve is set to the caboose brake pipe pressure when the brake pipe is fully charged. Due to brake pipe gradient, this setting differs from that of the locomotive brake valve and is compensated for by a gradient memory circuit which modifies the feedback signal so that the degree of pressure adjustment provided by the caboose regulating valve matches that of the locomotive. A relay valve device at the caboose operates in response to a reduction or caboose equalizing reservoir pressure to provide a reduction of caboose brake pipe pressure corresponding to the reduction of brake pipe pressure at the locomotive.</p> |
