Rack calibration system and method for SCR device of vehicle exhaust aftertreatment system
A technology for exhaust post-processing and bench calibration, which is applied in the direction of electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust treatment, etc., and can solve the problem of increasing the complexity of bench calibration or testing of SCR devices, Issues such as prolonging the preparation time for SCR bench test
Pending Publication Date: 2021-06-25
ROBERT BOSCH GMBH
View PDF0 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
This not only increases the complexity of SCR device bench calibration or testing, but also prolongs the preparation time for SCR bench testing
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0036] figure 1 A part of an SCR device bench calibration or testing system according to the present application is shown. The bench in the SCR device bench calibration system is not the focus of this application, so it is not shown in the figure, and will not be described in detail here.
[0037] refer to figure 1 , shows the engine 10 installed on the stand and the exhaust pipe 20 protruding from the engine 10, the exhaust gas discharged from the engine 10 flows through the exhaust pipe 20 along the arrow direction A.
[0038] Along the arrow direction A, the exhaust gas from the engine 10 sequentially flows through the NOx trap (NSC) device 30, the particulate filter (DPF) device 40, and the selective catalytic reduction (SCR) device in the aftertreatment system with the SCR device. ) device 50. exist figure 1In the embodiment, along the exhaust pipe 20, the DPF device 40 is arranged between the NSC device 30 and the SCR device 50, or along the flow direction A of the e...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a rack calibration method for an SCR device of an engine exhaust aftertreatment system. The rack calibration method comprises the steps that the exhaust aftertreatment system is provided, the exhaust aftertreatment system comprises an NSC device, a DPF device and the SCR device which are sequentially arranged in the flowing direction of engine exhaust, a first NOx sensor and a second NOx sensor, wherein the NSC device is located at the most upstream, the first NOx sensor is arranged at the upstream of the NSC device and configured to measure a NOx content in exhaust gas entering the NSC device, and the second NOx sensor is disposed between the downstream of the DPF device and the SCR device and configured to measure a NOx content in the exhaust gas entering the SCR device; an engine is started, and the exhaust gas from the engine sequentially flows through the NSC device, the DPF device and the SCR device in the flowing direction; a content difference between the NOx contents measured by the first NOx sensor and the second NOx sensor is calculated; the content stable duration is recorded when the content difference is continuously in a preset difference value range; and when the content stable duration reaches preset content stable duration, full and no-load testing of the SCR device is started.
Description
technical field [0001] The present application relates to the field of vehicle engine bench testing, in particular to a bench calibration system and method for a Selective Catalytic Reduction (SCR) device in an engine exhaust aftertreatment system. Background technique [0002] An important part of the SCR bench calibration process is the SCR full and empty test (Load&Empty Test), the test results can be used to evaluate the NOx conversion efficiency and NH of the SCR device of the engine exhaust aftertreatment system 3 storage capacity. [0003] Before the SCR full and empty load test, the SCR device needs to be pretreated, that is, the NH stored in the SCR device should be cleared. 3 . After pretreatment, the entire full-empty load test needs to be carried out under stable conditions, which involve at least the following aspects: the NOx concentration in the exhaust gas at the inlet of the SCR device is basically stable or constant for a specific period of time, the SCR ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): F01N11/00F01N3/20
CPCF01N11/00F01N3/2066F01N2570/14Y02T10/12Y02T10/40Y02A50/20
Inventor 王春梅
Owner ROBERT BOSCH GMBH