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    • 2. 发明授权
    • Starter thermal overload protection system
    • 起动机热过载保护系统
    • US4494162A
    • 1985-01-15
    • US316640
    • 1981-10-30
    • Francis R. Eyler
    • Francis R. Eyler
    • H02H3/087H02H7/085H02H5/04
    • F02N11/10H02H3/087H02H7/0859
    • A system for protecting the starter of an internal combustion engine from overheating as a result of cranking for an excessive period of time when the engine is difficult to start. Override circuitry is electrically interposed between a manually operable starter switch and the engine starter to apply a prescribed ON and OFF cranking sequence to the starter and thereby limit the duty cycle even though the operator continuously operates the switch. Preferably, the overall maximum duration of the start attempt (the duration of the ON and OFF cranking sequence) is limited by termination circuitry. The ON and OFF cranking intervals and, optionally, the overall maximum duration of the start attempt are particularly selected so as to allow sufficient time for motor winding heat to dissipate into the starter housing. This limited cranking duty cycle protects the starter from overheating. Also, when employed in combination with a thermostatic switch mounted on the starter housing and arranged to prevent starter energization when a predetermined temperature is reached, the limited starter ON time and intermediate resting periods permit the housing and the thermostatic switch to more closely follow winding temperature. As a further aspect, in order to maintain optimum operation of the protection system as starter load conditions vary, starter current is sensed and the starter ON/OFF duty cycle is appropriately modified in response.
    • 一种用于在发动机难以启动时由于起动一段时间而保护内燃机的起动器免于过热的系统。 覆盖电路电连接在可手动启动的起动开关和发动机起动器之间,以便对起动器施加规定的开启和关闭起动顺序,从而即使操作者连续地操作开关来限制占空比。 优选地,启动尝试的总最大持续时间(ON和OFF启动序列的持续时间)受终端电路的限制。 特别地选择ON和OFF起动间隔以及可选地启动尝试的整体最大持续时间,以便允许足够的时间使电动机绕组热消散到起动器壳体中。 这个有限的启动占空比保护起动器免于过热。 此外,当与安装在起动机壳体上的恒温开关组合使用并且布置成当达到预定温度时防止起动器通电,限制起动器接通时间和中间静止时间允许壳体和恒温开关更接近于绕组温度 。 作为另一方面,为了在起动器负载条件变化的情况下保持保护系统的最佳操作,检测起动器电流并且响应地适当地修改起动器ON / OFF占空比。