IC660BBD021
IC660BBD021
IC660BBD021
IC660BBD021
在東風4型機車上裝有電動機油泵和燃油泵，在每次起動前需延時45s~60s 供機油和燃油，供機油是為了防止在柴油機停機時間較長時，其各運動部件拉傷，而提供的燃油則是為柴油機點火建立燃油壓力。在供機油過程中，起動滑油泵運轉時間不能過長，否則不利于蓄電池的保養(yǎng)。在起動過程中，起動電機轉動和燃油泵向氣缸內供油為同步控制。油壓建立以前，起動電機不可以停轉。
起動柴油機必須解決3 個問題：（1）燃油的供給；（2）運動部件的潤滑；（3）蓄電池向起動電機供電，QD 帶動柴油機轉動。在整個起動過程中，對起動電機和噴油泵供油齒條的控制，都是通過起動接觸器（Q C）來實現(xiàn)的。
這種控制方法存在如下缺陷：
a.操縱人員必須通過主觀判斷起動完成與否來控制柴油機起動，每次起動都需要耳聽發(fā)火聲，眼睛觀察機油壓力表的變化；
b.向氣缸內供油過早，在柴油機低速轉動時，噴油器的噴油質量很差，將降低氣缸內的溫度，拖延點火轉速，導致起動能量耗高，排煙量大，甚至爆燃；
c. 在柴油機氣缸內已經點火后，蓄電池繼續(xù)向起動電機供電，造成蓄電池的放電量大；
d. 如果由于某種原因柴油機不能正常點火，將出現(xiàn)起動接觸器燒死的情況，并且蓄電池虧能增大。
2 柴油機起動過程的編程設計
針對目前柴油機起動過程中的缺陷和不足，可以將其起動過程按時間展開，進行編程控制，采用PCC 實現(xiàn)檢測和控制環(huán)節(jié)。
柴油機的起動過程大致可分為4 個階段，準備、柴油機被驅動轉動、點火和建立油壓穩(wěn)定運轉。準備階段主要是預供機油和燃油。東風4型機車采用45s 延時控制燃油泵和機油泵運轉。實現(xiàn)起動前預先向管路供油。根據(jù)起動過程的不同階段，結合前面柴油機起動過程中的問題，可逐步解決。
在東風4型機車上裝有電動機油泵和燃油泵，在每次起動前需延時45s~60s 供機油和燃油，供機油是為了防止在柴油機停機時間較長時，其各運動部件拉傷，而提供的燃油則是為柴油機點火建立燃油壓力。在供機油過程中，起動滑油泵運轉時間不能過長，否則不利于蓄電池的保養(yǎng)。在起動過程中，起動電機轉動和燃油泵向氣缸內供油為同步控制。油壓建立以前，起動電機不可以停轉。
起動柴油機必須解決3 個問題：（1）燃油的供給；（2）運動部件的潤滑；（3）蓄電池向起動電機供電，QD 帶動柴油機轉動。在整個起動過程中，對起動電機和噴油泵供油齒條的控制，都是通過起動接觸器（Q C）來實現(xiàn)的。
這種控制方法存在如下缺陷：
a.操縱人員必須通過主觀判斷起動完成與否來控制柴油機起動，每次起動都需要耳聽發(fā)火聲，眼睛觀察機油壓力表的變化；
b.向氣缸內供油過早，在柴油機低速轉動時，噴油器的噴油質量很差，將降低氣缸內的溫度，拖延點火轉速，導致起動能量耗高，排煙量大，甚至爆燃；
c. 在柴油機氣缸內已經點火后，蓄電池繼續(xù)向起動電機供電，造成蓄電池的放電量大；
d. 如果由于某種原因柴油機不能正常點火，將出現(xiàn)起動接觸器燒死的情況，并且蓄電池虧能增大。
2 柴油機起動過程的編程設計
針對目前柴油機起動過程中的缺陷和不足，可以將其起動過程按時間展開，進行編程控制，采用PCC 實現(xiàn)檢測和控制環(huán)節(jié)。
柴油機的起動過程大致可分為4 個階段，準備、柴油機被驅動轉動、點火和建立油壓穩(wěn)定運轉。準備階段主要是預供機油和燃油。東風4型機車采用45s 延時控制燃油泵和機油泵運轉。實現(xiàn)起動前預先向管路供油。根據(jù)起動過程的不同階段，結合前面柴油機起動過程中的問題，可逐步解決。
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