374D and 390D Excavators Machine Electronic Control System Caterpillar


Pedal Control

Usage:

390D BYP



图 1g00629518

附件踏板

(1) 示意图符号

(2) 附件踏板

踏板输出为脉冲宽度调制信号(PWM)。 踏板在中位或空档位置下的 PWM 输出约为 50% 的占空比。 踏板在极限位置的 PWM 输出约为 5 和 95% 的占空比。 踏板校准设定的工厂缺省值为 5、50 和 95% 的占空比。

可以通过电子技师或信息中心查看踏板的百分比值。

如果 PWM 输出或占空比不在表 1 内所示的限定范围内,则记录诊断代码。

表 1
信号     最小值     最大值    
频率     400 Hz     600 Hz    
工作循环     2 %     98 %    

表 2
电压输出    
踏板位置     电压     工作循环    
完全向前     1.2 至 1.9 DCV     5%    
空档     4.3 至 4.9 DCV     50%    
完全向后     7.5 至 8.1 DCV     95%    

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