Shift Inhibit Function
当请求升档时，ECM 监测以下功能：
- 发动机转速
- 发动机负载系数
- 变矩器输出转速
- 变速箱输出转速
ECM 确定负载系数是否小于目标阈值，从而允许换档。 规定阈值用来确保以下条件：
- 能够获得目标档位。
- 锁定离合器能够成功接合。
- 离合器耐用性不受影响。
如果负载系数大于阈值，ECM 将会在满足规定条件之前禁止升档。
Caterpillar Information System:
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