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IC660BBD021

IC660BBD021

IC660BBD021

IC660BBD021

在東風(fēng)4型機(jī)車上裝有電動機(jī)油泵和燃油泵，在每次起動前需延時45s~60s 供機(jī)油和燃油，供機(jī)油是為了防止在柴油機(jī)停機(jī)時間較長時，其各運(yùn)動部件拉傷，而提供的燃油則是為柴油機(jī)點(diǎn)火建立燃油壓力。在供機(jī)油過程中，起動滑油泵運(yùn)轉(zhuǎn)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(jī)轉(zhuǎn)動和燃油泵向氣缸內(nèi)供油為同步控制。油壓建立以前，起動電機(jī)不可以停轉(zhuǎn)。 

       起動柴油機(jī)必須解決3 個問題：（1）燃油的供給；（2）運(yùn)動部件的潤滑；（3）蓄電池向起動電機(jī)供電，QD 帶動柴油機(jī)轉(zhuǎn)動。在整個起動過程中，對起動電機(jī)和噴油泵供油齒條的控制，都是通過起動接觸器（Q C）來實(shí)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(jī)起動，每次起動都需要耳聽發(fā)火聲，眼睛觀察機(jī)油壓力表的變化； 

       b.向氣缸內(nèi)供油過早，在柴油機(jī)低速轉(zhuǎn)動時，噴油器的噴油質(zhì)量很差，將降低氣缸內(nèi)的溫度，拖延點(diǎn)火轉(zhuǎn)速，導(dǎo)致起動能量耗高，排煙量大，甚至爆燃； 

       c. 在柴油機(jī)氣缸內(nèi)已經(jīng)點(diǎn)火后，蓄電池繼續(xù)向起動電機(jī)供電，造成蓄電池的放電量大； 

       d. 如果由于某種原因柴油機(jī)不能正常點(diǎn)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(jī)起動過程的編程設(shè)計 
       針對目前柴油機(jī)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(jìn)行編程控制，采用PCC 實(shí)現(xiàn)檢測和控制環(huán)節(jié)。 

       柴油機(jī)的起動過程大致可分為4 個階段，準(zhǔn)備、柴油機(jī)被驅(qū)動轉(zhuǎn)動、點(diǎn)火和建立油壓穩(wěn)定運(yùn)轉(zhuǎn)。準(zhǔn)備階段主要是預(yù)供機(jī)油和燃油。東風(fēng)4型機(jī)車采用45s 延時控制燃油泵和機(jī)油泵運(yùn)轉(zhuǎn)。實(shí)現(xiàn)起動前預(yù)先向管路供油。根據(jù)起動過程的不同階段，結(jié)合前面柴油機(jī)起動過程中的問題，可逐步解決。 

在東風(fēng)4型機(jī)車上裝有電動機(jī)油泵和燃油泵，在每次起動前需延時45s~60s 供機(jī)油和燃油，供機(jī)油是為了防止在柴油機(jī)停機(jī)時間較長時，其各運(yùn)動部件拉傷，而提供的燃油則是為柴油機(jī)點(diǎn)火建立燃油壓力。在供機(jī)油過程中，起動滑油泵運(yùn)轉(zhuǎn)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(jī)轉(zhuǎn)動和燃油泵向氣缸內(nèi)供油為同步控制。油壓建立以前，起動電機(jī)不可以停轉(zhuǎn)。 

       起動柴油機(jī)必須解決3 個問題：（1）燃油的供給；（2）運(yùn)動部件的潤滑；（3）蓄電池向起動電機(jī)供電，QD 帶動柴油機(jī)轉(zhuǎn)動。在整個起動過程中，對起動電機(jī)和噴油泵供油齒條的控制，都是通過起動接觸器（Q C）來實(shí)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(jī)起動，每次起動都需要耳聽發(fā)火聲，眼睛觀察機(jī)油壓力表的變化； 

       b.向氣缸內(nèi)供油過早，在柴油機(jī)低速轉(zhuǎn)動時，噴油器的噴油質(zhì)量很差，將降低氣缸內(nèi)的溫度，拖延點(diǎn)火轉(zhuǎn)速，導(dǎo)致起動能量耗高，排煙量大，甚至爆燃； 

       c. 在柴油機(jī)氣缸內(nèi)已經(jīng)點(diǎn)火后，蓄電池繼續(xù)向起動電機(jī)供電，造成蓄電池的放電量大； 

       d. 如果由于某種原因柴油機(jī)不能正常點(diǎn)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(jī)起動過程的編程設(shè)計 
       針對目前柴油機(jī)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(jìn)行編程控制，采用PCC 實(shí)現(xiàn)檢測和控制環(huán)節(jié)。 

       柴油機(jī)的起動過程大致可分為4 個階段，準(zhǔn)備、柴油機(jī)被驅(qū)動轉(zhuǎn)動、點(diǎn)火和建立油壓穩(wěn)定運(yùn)轉(zhuǎn)。準(zhǔn)備階段主要是預(yù)供機(jī)油和燃油。東風(fēng)4型機(jī)車采用45s 延時控制燃油泵和機(jī)油泵運(yùn)轉(zhuǎn)。實(shí)現(xiàn)起動前預(yù)先向管路供油。根據(jù)起動過程的不同階段，結(jié)合前面柴油機(jī)起動過程中的問題，可逐步解決。 

BALDOR Assy PUMP Motor W/viton 34H609W315G1

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