CN103726934B - A hybrid automobile exhaust gas control method for full throttle - Google Patents

A hybrid automobile exhaust gas control method for full throttle Download PDF

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Publication number
CN103726934B
CN103726934B CN 201410013412 CN201410013412A CN103726934B CN 103726934 B CN103726934 B CN 103726934B CN 201410013412 CN201410013412 CN 201410013412 CN 201410013412 A CN201410013412 A CN 201410013412A CN 103726934 B CN103726934 B CN 103726934B
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exhaust gas
exhaust
engine
branch
throttle
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CN 201410013412
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CN103726934A (en )
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喻骏
丁济凡
李儒龙
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东风汽车公司
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Abstract

本发明属于汽车技术领域,具体涉及一种混合动力汽车节气门全开的排气控制方法。 The present invention belongs to the field of automotive technology, in particular to a hybrid vehicle control method of the exhaust gas of full throttle. 其控制过程为:首先在发动机节气门的催化器上设置一条与排气主干路连通的排气旁通支路,然后在发动机断油节气门全开一定时间后开通排气旁通支路,在发动机断油节气门退出全开状态后发动机开始动力输出时关闭通排气旁通支路,避免尾气未经过催化剂便通过通排气旁通支路排出。 Controlling the process as follows: First, a branch is provided with an exhaust bypass passage communicating the exhaust trunk of the engine throttle on the catalyst, and then off after a certain time the oil full-throttle opening of the engine exhaust gas in the bypass branch, exhaust gas through the bypass branch off at the start of the engine output power of the engine after the fuel cut exit throttle fully opened state, the exhaust gas has not been avoided by the catalyst will be discharged through the exhaust bypass branch. 本发明可有效解决因节气门全开后大量新鲜空气进入催化器导致催化器带来的催化转化效率降低和NOx排放增多的问题。 The present invention can effectively solve the problems caused by the catalyst and the catalytic conversion efficiency decreases due to an increase in NOx emissions after a large number of fresh air into the catalytic converter leads to a wide open throttle.

Description

一种混合动力汽车节气门全开的排气控制方法 A hybrid automobile exhaust gas control method for full throttle

技术领域 FIELD

[0001]本发明属于汽车技术领域,具体涉及一种混合动力汽车节气门全开的排气控制方法。 [0001] The present invention belongs to the field of automotive technology, in particular to a hybrid vehicle control method of the exhaust gas of full throttle.

背景技术 Background technique

[0002]混合动力电动汽车将发动机、电机、能量储存装置(蓄电池等)组合在一起,它们之间的良好匹配和优化控制,可充分发挥内燃机汽车和电动汽车的优点,避免各自的不足,是当今最具实际开发意义的低排放和低油耗汽车。 [0002] The hybrid electric vehicle engine, the motor, the energy storage device (battery, etc.) in combination, a good match between the control and optimization of them, can give full play to the advantages of internal combustion engine vehicles and electric vehicles, avoiding their shortcomings, it is low emissions of today's most practical significance of the development and fuel efficient vehicles. 发动机在低负荷运转时,其燃油消耗提供的输出扭矩都用于克服栗气损失,如果能减小甚至消除栗气损失,那么发动机的燃油消耗也会大幅降低,现有为消除混合动力电动汽车的栗气损失,有效减少发动机的制动力,通常采用发动机断油节气门全开技术来减小栗气损失。 When the engine low load operation, the output torque of fuel consumption which are provided for overcoming Li loss is, if Li can reduce or even eliminate the loss of gas, the fuel consumption of the engine will be substantially reduced, as the elimination of the conventional hybrid electric vehicles chestnut gas losses, reduce the braking force of the engine, usually the engine full throttle fuel cut Li techniques to reduce air loss. 但采用发动机断油节气门全开技术后,更多的新鲜空气被压入三元催化器中,三元催化器中的新鲜空气过多不仅会降低催化器温度、削弱催化转换效率,而且而大量的新鲜空气进入到三元催化器中,还会造成一个高温富氧的反应条件,促使氮气大量转化成氮氧化合物,排放到空气中后对环境污染较大。 But the use of full throttle fuel cut engine technology, more fresh air is pressed into the three-way catalyst, the excess fresh air in the three-way catalyst will not only reduce the catalyst temperature, the catalytic conversion efficiency to weaken, and the a large amount of fresh air entering into the three-way catalyst, the high temperature will result in an oxygen-rich reaction conditions, to promote substantial conversion of nitrogen oxides to nitrogen, the air polluting emissions into the environment.

发明内容 SUMMARY

[0003]本发明的目的就是为了解决上述背景技术存在的不足,提供一种混合动力汽车节气门全开的排气控制方法。 [0003] The object of the present invention is to solve the shortcomings of the background art, there is provided a method of controlling exhaust gas hybrid vehicle full throttle.

[0004]本发明采用的技术方案是:一种混合动力汽车节气门全开的排气控制方法,包括以下步骤: [0004] aspect of the present invention is employed: A hybrid car full throttle exhaust gas control method comprising the steps of:

[0005] ( I)、在发动机节气门的催化器上设置一条与排气主干路连通的排气旁通支路,所述排气旁通支路上设置控制阀; [0005] (I), a bypass branch is provided an exhaust passage communicating with the exhaust trunk on the engine throttle catalytic converter, the bypass exhaust gas control valve disposed branch;

[0006] (2)、在发动机断油节气门全开一定时间后开通排气旁通支路,使新鲜空气部分从排气旁通支路流过而不完全经过装有催化剂的排气主干路; [0006] (2), after the fuel cut engine full throttle opening of the exhaust bypass branch predetermined time, fresh air portion of the exhaust gas from the bypass branch flows through the exhaust gas without fully backbone containing catalyst road;

[0007] (3)、在发动机断油节气门退出全开状态后发动机开始动力输出时关闭通排气旁通支路,避免尾气未经过催化剂便通过通排气旁通支路排出。 [0007] (3), the exhaust gas through the bypass branch off at the start of the engine output power of the engine after the fuel cut exit throttle fully opened state, the exhaust gas has not been avoided by the catalyst will be discharged through the exhaust bypass branch.

[0008]进一步地,所述步骤(I)中排气旁通支路的支路管径大小为排气主干路管径的I/2-3/4ο [0008] Further, the step (I), the diameter size of the exhaust branch bypass branch exhaust passage trunk diameter of I / 2-3 / 4ο

[0009]更进一步地,所述步骤(2)中发动机断油节气门全开与排气旁通支路开通之间的间隔时间为0.3-ls。 The interval between [0009] Furthermore, the step (2) fuel cut engine full throttle opening of the exhaust bypass branch 0.3-ls.

[0010]本发明的控制方法可使节气门全开后流入的大量新鲜空气不完全经过装有催化剂的主干路,从而保证不会出现因大量空气降低催化器温度而导致催化转化效率降低的问题,同时因没有大量新鲜空气流入主干路,仅催化剂的高温环境无法产生较多的NOx,有效减少NOx的排放量。 [0010] The control method of the present invention can fully open throttle inflow of a large amount of fresh air is not completely through the trunk road with the catalyst, so as to ensure a large number of air does not occur due to the catalyst temperature decrease result in reduced efficiency of the catalytic conversion, At the same time because there is no large amount of fresh air flowing into the main road, not only the catalyst of high temperatures produce more NOx, effectively reduce NOx emissions. 该方法简单有效,在不降低催化器转化效率的同时,可减少对环境的污染。 The method is simple and effective, without decreasing the catalyst conversion efficiency, can reduce environmental pollution.

附图说明 BRIEF DESCRIPTION

[0011]图1为本发明NEDC循环过程中催化器温度变化示意图。 [0011] FIG. 1 is a schematic catalyst temperature NEDC cycle of the present invention.

[0012]图2为本发明节气门正常工作状态下的排气控制示意图。 [0012] FIG exhaust throttle valve 2 under normal operating state control schematic of the present invention.

[0013]图3为本发明节气门全开状态下的排气控制示意图。 [0013] FIG. 3 of the exhaust gas at full throttle control schematic of the present invention.

具体实施方式 detailed description

[0014]下面结合附图和具体实施例对本发明作进一步的详细说明,便于清楚地了解本发明,但它们不对本发明构成限定。 [0014] conjunction with the accompanying drawings and the following specific embodiments of the present invention will be described in further detail, facilitate a clear understanding of the invention, but they do not limit the present invention.

[0015]三元催化器是安装在汽车排气系统中最重要的机外净化装置,它可将汽车尾气排出的C0、HC和NOx等有害气体通过氧化和还原作用转变为无害的二氧化碳、水和氮气,使汽车尾气得以净化。 [0015] The catalytic converter is installed C0, HC and NOx and other harmful gases outside the most important systems in automotive engine exhaust purification device, which may be an automobile exhaust gas discharged by oxidation and reduction into harmless carbon dioxide, water and nitrogen, so that car exhaust will be purified. 三元催化剂最低要在350°C的时候起反应,温度过低时,转换效率急剧下降;而催化剂的活性温度(最佳的工作温度)是400°C到800°C左右,过高也会使催化剂老化加剧。 Catalyst from at least three yuan to 350 ° C when the reaction temperature is too low, the conversion efficiency drastically decreased; the activation temperature (optimum operating temperature) of the catalyst is 400 ° C to about 800 ° C, too high will the catalyst aging rapidly. 如图1所示,带节气门全开技术后三元催化器内温度明显高于不带节气门全开技术的温度,此时会导致大量的新鲜空气进入到三元催化器中,造成一个高温富氧的反应条件,促使氮气大量转化成氮氧化合物,造成了NOx的产生。 1, with a wide open throttle after the three-way catalyst technology temperatures significantly above the temperature Without full throttle art, this time can cause a lot of fresh air into the three-way catalyst, resulting in a the reaction conditions of high temperature oxygen-rich to promote substantial conversion of nitrogen oxides to nitrogen, resulting in the generation of NOx.

[0016]如图2、图3所示,要解决节气门全开后大量新鲜空气进入催化器导致催化器的催化转化效率降低和NOx排放增多的问题,本发明采用的方法步骤为: [0016] As shown in FIG 2, FIG. 3, to solve the problem a lot of fresh air into the catalyst after the catalytic converter resulting in full-throttle catalyst efficiency and reduced NOx emissions increase, the steps of the method of the present invention is used are:

[0017] (I)、在发动机节气门的催化器上设置一条与排气主干路连通的排气旁通支路,排气旁通支路上设置控制阀,通过控制阀的关闭和打开实现排气旁通支路的关闭与开通。 [0017] (I), provided a passage communicating with the exhaust trunk throttle on the engine exhaust gas catalyst bypass branch, branch exhaust bypass control valve is provided, achieved by controlling the exhaust valve opening and closing Close to the opening of the air bypass branch. 排气旁通支路的管径大小需要满足尽量将发动机断油节气门全开时进入的新鲜空气从支路排出的目的,因此支路管径的大小取决于主路管径的大小、走向和布置,本实施例中排气旁通支路的支路管径大小为排气主干路管径的1/2-3/4。 Exhaust bypass branch tube sizes required to meet the object as far as possible into the wide open throttle when the engine fuel cut fresh air discharged from the branch, the branch diameter and therefore depend on the size of the diameter of the main road towards and arrangement, the present embodiment the exhaust gas bypass branch diameter size of the exhaust branch passage trunk diameter of 1 / 2-3 / 4.

[0018] (2)、上述排气旁通支路只有在发动机断油节气门全开一定延迟时间后才开通,这样不仅可使新鲜空气部分从排气旁通支路流过而不完全经过装有催化剂的排气主干路,而且可确保流过排气旁通支路的是新鲜空气而不是在发动机内燃烧产生的尾气。 [0018] (2), of the bypass branch only after the fuel cut engine full throttle opening of a certain time delay, so that not only can fresh air portion from the exhaust gas flowing through the bypass branch without completely through Main exhaust passage containing the catalyst, but also to ensure that the exhaust gas flowing through the exhaust bypass branch is the fresh air instead of combustion in the engine. 新鲜空气部分从排气旁通支路流过,可在一定程度上减弱新鲜空气对催化器的冷却效果,同时因为没有了大量的新鲜空气流入排气主干路,仅仅高温环境是无法产生较多的NOx,减少对环境的污染。 The fresh air portion flows through the exhaust gas from the bypass branch, it may reduce the cooling effect of fresh air for the catalytic converter to a certain extent, and because there is no large amount of fresh air flowing into the exhaust trunk road, not only the high temperature environment produces more of NOx, reduce environmental pollution.

[0019]发动机断油节气门全开与排气旁通支路开通之间的间隔时间必须保证发动机从工作状态切换到断油节气门全开时残余的尾气全部从三元催化剂转化排尽,即间隔时间取决于尾气的排出速度,在保证尾气完全走排气主干路排出的前提下尽可能取小,本实施例米用的延迟时间为0.3_ls。 [0019] full throttle fuel cut engine exhaust bypass branch and the interval between the opening must ensure that the engine is switched from the operating state to the residue of the exhaust gas when fuel cut open throttle full conversion drained from the three-way catalyst, That time interval depends on the speed of the exhaust gas is discharged, as exhaust gas taken in ensuring small go completely discharged exhaust passage trunk premise, with the present embodiment, the delay time m 0.3_ls.

[0020] (3)、在发动机断油节气门退出全开状态后发动机开始动力输出时关闭通排气旁通支路,避免尾气未经过催化剂便通过通排气旁通支路排出。 [0020] (3), the exhaust gas through the bypass branch off at the start of the engine output power of the engine after the fuel cut exit throttle fully opened state, the exhaust gas has not been avoided by the catalyst will be discharged through the exhaust bypass branch.

[0021]本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。 SUMMARY [0021] In the present specification, not described in detail belong to the prior art techniques known to technicians.

Claims (2)

  1. 1.一种混合动力汽车节气门全开的排气控制方法,其特征在于,包括以下步骤: (1)、在发动机节气门的催化器上设置一条与排气主干路连通的排气旁通支路,所述排气旁通支路上设置控制阀;排气旁通支路的支路管径大小为排气主干路管径的1/2-3/4; (2)、在发动机断油节气门全开一定时间后开通排气旁通支路,使新鲜空气部分从排气旁通支路流过而不完全经过装有催化剂的排气主干路; (3)、在发动机断油节气门退出全开状态后发动机开始动力输出时关闭通排气旁通支路,避免尾气未经过催化剂便通过通排气旁通支路排出。 A hybrid vehicle control method of the exhaust gas full throttle, characterized by comprising the steps of: (1) is provided with an exhaust bypass passage communicating the exhaust trunk on the engine throttle catalyst branch, the branch exhaust bypass control valve is provided; branch diameter size of the exhaust gas bypass branch exhaust passage trunk diameter of 1 / 2-3 / 4; (2), in the engine off after a certain time the oil full throttle opening of the exhaust bypass branch, fresh air portion of the exhaust gas from the bypass branch exhaust gas flowing through the main conduit without completely through the catalyst-filled; (3), an engine fuel cut Close the throttle valve fully opened state begins to exit the output power of the engine exhaust gas through the bypass branch, through the catalyst will not prevent the exhaust gas is discharged through the exhaust gas through the bypass branch.
  2. 2.根据权利要求1所述的一种混合动力汽车节气门全开的排气控制方法,其特征在于:所述步骤(2)中发动机断油节气门全开与排气旁通支路开通之间的间隔时间为0.3-ls。 A hybrid car according to claim 1 full throttle exhaust gas control method as claimed in claim, wherein: said step (2) fuel cut engine full throttle opening of the exhaust bypass branch is the interval between the 0.3-ls.
CN 201410013412 2014-01-13 2014-01-13 A hybrid automobile exhaust gas control method for full throttle CN103726934B (en)

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CN106593600A (en) * 2016-12-26 2017-04-26 潍柴动力股份有限公司 Exhaust postprocessing device and method used for engine

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JP3972727B2 (en) * 2002-05-16 2007-09-05 トヨタ自動車株式会社 Exhaust gas purification system for an internal combustion engine
JP4793103B2 (en) * 2006-06-01 2011-10-12 日産自動車株式会社 Internal combustion engine
CN102251835A (en) * 2009-09-29 2011-11-23 福特环球技术公司 Particulate filter regeneration during engine shutdown
WO2013079117A1 (en) * 2011-12-01 2013-06-06 Umicore Ag & Co. Kg Method for operating exhaust gas purification systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3972727B2 (en) * 2002-05-16 2007-09-05 トヨタ自動車株式会社 Exhaust gas purification system for an internal combustion engine
JP4793103B2 (en) * 2006-06-01 2011-10-12 日産自動車株式会社 Internal combustion engine
CN102251835A (en) * 2009-09-29 2011-11-23 福特环球技术公司 Particulate filter regeneration during engine shutdown
WO2013079117A1 (en) * 2011-12-01 2013-06-06 Umicore Ag & Co. Kg Method for operating exhaust gas purification systems

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