TH48-E70 Petroleum Transmission Caterpillar


Transmission Warm-up

Usage:

TH48-E70 JGC
本 TH48-E70 石油变速箱具有在寒冷环境中利用变矩器失速预热变速箱和发动机的功能。

变矩器失速会增加发动机负载,并使变矩器产生热量。 加热后的变矩器油通过变速箱油冷却器将热量传递给发动机冷却液。 待机油返回变速箱后,还将热量传递给油池中的机油。

对于使用 J1939 换档器的应用,可能需要切换至 "2R" 以启用此功能。 对于使用开关接地型换档器的应用,通过切换至停车档并使变速箱的失速启用电路接地来启用此功能。 将 ECM 插脚 J1-64(用户接头插脚 4)接地,接通变速箱的失速启用电路。 符合下列所有条件时,变速箱 ECM 将启用失速。

  • 变速箱油温低于 87° C (190° F)

  • 变矩器油温低于 110° C (230° F)

  • 发动机转速低于 1000 rpm 并大于 500 rpm 时。

在发生以下某种情况时,变速箱将自动从失速切换到停车档:

  • 如果变速箱油温超过 93° C (200° F)

  • 变矩器油温超过 120° C (248° F)

  • 发动机转速高于 1300 rpm。

如果在变速箱停车期间发动机转速超过 1000 rpm,将记录"变速箱误操作警告事件"。 选择失速模式时,变速箱将按照上述标准自动在失速和停车档之间循环。 循环到失速的最大速率将由定时器限定到每 60 秒一次。 当变速箱机油冷却或速度下降时,用于变速箱预热的变矩器失速模式将在符合标准时自动接合。

下列激活的电气故障将禁用失速,迫使变速箱挂入停车档。

  • 活动 ECPC 电磁阀诊断故障

  • 活动锁定离合器电磁阀对蓄电池诊断故障短路

  • 变矩器油温传感器故障

  • 发动机转速传感器故障

如果在失速模式中变速箱输出速度超过 50 rpm,变速箱将执行下列操作:

  • 换至停车档

  • 在 Cat 电子技师中记录 718-14 变速箱系统专门说明书诊断代码。

  • 亮起淡黄色警告灯并在 J1939 DM2(诊断信息 2)上广播淡黄色警告灯状态。

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