Jess匹配规则不触发

Question

我在定义匹配规则时遇到困难。

(defrule set-current  
    ?desAct <- (Actuator (name 0) (StrokeLength ?sl) (Force ?f) 
    (nominalCurrent ?c3)) 
    (test (eq ?c3 0)) ; I have defined this to change only if value is not 
                      ; set yet
    ?act <- (Actuator (inputVoltage ?v1)  ; actuator that has matching slots
    (StrokeLength ?sl1)
    (nominalCurrent ?c1))
    (test (eq ?sl1 ?sl)) ; for same stroke length I want to modify 
                         ; nominalCurrent of ?desAct
    =>
    (modify ?desAct (nominalCurrent ?c1))
    )   

?desAct表示我希望根据某些标准根据其他现有事实更改哪些槽值的事实。我不确定为什么这条规则不会因为以下事实而触发：

f-4   (MAIN::Actuator (name 4) (inputVoltage 12) (Force 17) (StrokeLength 10) (length 62) (width 18) (height 15.1) (motorType DC) (speedAtNomLoad 25) (weight 28) (nominalCurrent 0.46) (highTemp 50) (lowTemp -10) (price 90) (dutyCycle 20))
f-9   (MAIN::Actuator (name 0) (inputVoltage 12) (Force 17) (StrokeLength 10) (length 10) (width 10) (height 10) (motorType DC) (speedAtNomLoad 0) (weight 0) (nominalCurrent 0) (highTemp 0) (lowTemp 0) (price 0) (dutyCycle 0))

我期望与此规则的名称为0的执行器具有与f-4相同的nominalCurrent，但规则不会触发。