Operating method and corresponding drive system for an exhaust gas cleaning system
An operation method and exhaust gas purification technology, which can be applied to mechanical equipment, electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, etc.
Active Publication Date: 2020-03-03
MAN TRUCK & BUS AG
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Problems solved by technology
[0003] A disadvantage of such known methods is the fact that engine-side measures for improving the cleaning action of the exhaust gas catalytic converter (for example ignition angle retardation adjustment) lead to more fuel consumption and a correspondingly increased CO 2 emission
That is to say, for such known methods there is optimization of the cleaning effect of the exhaust gas catalytic converter on the one hand and the fuel consumption and CO on the other hand. 2 Contradictions between the objectives of the minimization of emissions
Method used
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Embodiment Construction
[0069] Figure 1A A flow chart is shown for explaining a part of the operating method according to the invention, which part is operated only once during a driving cycle, that is to say on the one hand with the ignition switched on and the engine started and on the other hand with the ignition switched off and the engine between stops.
[0070] In the first step S1, the oxygen storage capacity of the exhaust gas catalytic converter (OSC: O xygen S storage C apacity) to determine smaller and smaller limit values OSC1, OSC2, . . . , OSCn. Apply OSC1>OSC2>…>OSCn.
[0071] In a further step S2, increasingly larger partial areas A1, A2, . . . figure 2 is schematically shown in . For some areas A1, A2,...An, A1
[0072] The following description and figures show an example of a system with three subranges and three OSC limit values.
[0073] In step S3 , the real-time value OSC of the oxygen storage capacity of the exhaust gas catalytic converter is then...
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The invention relates to an operating method and a corresponding drive system for an exhaust gas purification system. Method for operating an exhaust gas purification system having an exhaust gas catalytic converter (4), comprising the following steps: -Determining catalytic converter characteristic parameters of the exhaust gas catalytic converter (4), wherein the catalytic converter characteristic a parameter describing the cleaning effect of the exhaust gas catalytic converter (4); and - when the catalytic converter characteristic parameter indicates that the cleaning effect of the exhaust gas catalytic converter (4) is not sufficient, performing a method for improving the exhaust gas catalytic converter (4) ) engine-side measures of the cleaning effect; and - ascertaining the operating point of the combustion engine (1) in the engine characteristic field. The invention provides that engine-related measures for improving the cleaning effect of the exhaust gas catalytic converter ( 4 ) are introduced depending on the operating point of the combustion engine ( 1 ). Furthermore, the invention includes a corresponding drive system.
Description
technical field [0001] The invention relates to an operating method for an exhaust gas purification system having an exhaust gas catalytic converter, for example a three-way catalytic converter, for purifying exhaust gas on a combustion engine, in particular in a motor vehicle. Furthermore, the invention relates to a drive system, in particular for a motor vehicle with a combustion engine and an exhaust gas catalytic converter. Background technique [0002] Exhaust gas purification systems are known from the prior art for the purification of exhaust gases on combustion engines, which use three-way catalytic converters. However, such three-way catalytic converters are subject to aging caused by natural and environmental influences, as a result of which the so-called light-off temperature increases, from which the exhaust gas catalytic converter is effective and provides a sufficient cleaning effect. In combustion engines with relatively low exhaust gas temperatures, there is...
Claims
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IPC IPC(8): F01N9/00F01N11/00F02D43/00
CPCF01N9/00F01N11/00F02D37/02F01N2430/08F01N2430/04F01N3/101F02D41/0235F02D41/024F01N2900/0416F01N2900/08F01N2900/1602F01N2900/1624F02D2200/0802F02D2200/0816F02D41/1456F02D41/2451F02D2200/0814Y02A50/20Y02T10/12Y02T10/40F01N3/20
Inventor F.W.普吕姆
Owner MAN TRUCK & BUS AG