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Observation method and observation system of diesel SCR system input state

A technology of SCR system and input state, which is applied in mechanical equipment, engine components, combustion engines, etc.

Inactive Publication Date: 2015-10-14
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is to find a method suitable for SCR system to replace expensive NOx or ammonia sensor and reduce the difficulty of fault diagnosis

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  • Observation method and observation system of diesel SCR system input state
  • Observation method and observation system of diesel SCR system input state
  • Observation method and observation system of diesel SCR system input state

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Embodiment Construction

[0041] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the protection scope of the present invention.

[0042] The method adopted in the present invention is: establish a state space model according to the chemical reaction in the SCR system, and use the extended Kalman filter (EKF) method to estimate the NOx concentration or the ammonia gas concentration at the inlet respectively in two cases. The first case: if figure 1 , assuming that the input concentration of NOx is known (obtained by sensor 1), the output concentration of NOx is known (obtained by sensor 3), and the output concentration of ammonia gas is known (obtained by sensor 4), then we can use the EKF control algorithm to estimate the ammonia gas The input concentration, so that the sensor 2 can be omitted. The second case: Assuming tha...

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Abstract

The invention discloses an observation method and an observation system of a diesel SCR (Selective Catalytic Reduction) system input state. The observation method comprises the following steps that Step 1, a state space model is established according to a chemical reaction in an SCR system; Step 2, the state space model is combined with an EKF (Extended Kalman Filter) equation, wherein the EKF equation comprises a prediction equation, namely x(k) is equal to f[x(k-1),u(k)] plus w(k), and a renewal equation, namely z(k) is equal to h[x(k)] plus v(k), x(k) represents a state vector, u(k) represents an input vector, w(k) represents a gaussian process noise, z(k) represents an observation vector, h(x) represents an observation function, and v(k) represents a gaussian observation noise; and Step 3, the EKF algorithm mentioned above is encoded with software, and computational simulation is performed, thereby obtaining an input concentration estimated value. According to the observation method and the observation system, the method expanding Kalman filters to perform input state observation is designed, so that the validity of a designed observer is verified in simulation; in addition, the precision of the estimated concentration is ensured; the expected design purpose is achieved; and an ammonia gas sensor or an NOx sensor at an inlet can be replaced completely.

Description

technical field [0001] The invention belongs to the field of diesel engine exhaust aftertreatment SCR system control, and relates to a control method, in particular, relates to an observation method and an observation system for the input state of a diesel engine SCR system, especially suitable for medium and heavy diesel engine exhaust aftertreatment SCR systems. Estimated observations of NOx and ammonia input concentrations. Background technique [0002] The market share of diesel engines in the automotive industry has been growing for nearly a decade, mainly due to its considerable advantages over gasoline engines in terms of fuel efficiency, durability and range of applications. However, in recent years, with the deterioration of the global environment and the improvement of people's awareness of environmental protection, the problem of diesel engine exhaust pollution, especially nitrogen oxide pollution has attracted more and more attention. In order to solve the probl...

Claims

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Application Information

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IPC IPC(8): F01N11/00
CPCY02T10/40
Inventor 蒋楷张辉孟飞耿鹏魏立江祝小元
Owner SHANGHAI MARITIME UNIVERSITY
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