A method for controlling an engine operating mode

A technology of engine operation and control method, which is applied in the direction of engine components, combustion engines, machines/engines, etc., which can solve the problems that fuel consumption cannot be combined with emissions, low-temperature crystallization, and market problems cannot be completely solved, so as to achieve efficient and safe operation.

Active Publication Date: 2022-02-01
FAW JIEFANG AUTOMOTIVE CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the existing application technology, there is no switching logic of multiple modes, and it is impossible to achieve optimal operation, which leads to taking into account fuel consumption but not emission, and emission but not low-temperature crystallization, and the market problem cannot be completely solved.

Method used

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  • A method for controlling an engine operating mode
  • A method for controlling an engine operating mode
  • A method for controlling an engine operating mode

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Embodiment 1

[0053] This embodiment provides a method for controlling the engine operation mode, such as figure 1 As shown, the control method includes:

[0054] Obtaining engine operating parameters, using the parameters to calculate an operating index, comparing the operating index with a preset index, and then selecting a working condition;

[0055] The parameters include SCR inlet temperature, exhaust gas mass flow M, actual urea injection volume M ad , upstream NOx concentration, downstream NO x Concentration, running time t i , post-processor back pressure and fault information;

[0056] The operating indicators include window temperature T i , the urea crystallization factor E corresponding to the window temperature i , NO x Actual removal efficiency η 0 , NO x Theoretical removal efficiency η 1 and engine load rate γ;

[0057] The operating conditions include low crystallization mode of operation or high NO x Conversion rate mode of operation;

[0058] The low crystalli...

Embodiment 2

[0061] This embodiment provides a specific control method of the engine operation mode, which can be referred to figure 1 , based on the normal operation mode of the vehicle, real-time monitoring of actual operating parameters, including SCR inlet temperature, exhaust gas flow, urea injection volume, SCR post-treatment upstream NO x value and downstream NO x and carry out risk identification and judgment of urea crystallization according to the operating parameters of the whole vehicle, and switch to engine operation mode 2 if the high risk of crystallization is satisfied; x Conversion efficiency identification and judgment, if the current operating mode is NO x If the conversion efficiency is low, switch to engine operation mode 3; thus solving crystallization and low NO in some special operating conditions x Conversion efficiency issues. The schematic diagram of the comparison of urea crystallization factors in conventional mode is shown in Figure 4 .

[0062] Specific...

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Abstract

The present invention relates to a control method of an engine operation mode. The control method comprises: acquiring engine operation parameters, calculating an operation index by using the parameters, comparing the operation index with a preset index, and then selecting a working condition; Parameters include SCR inlet temperature, exhaust gas mass flow M, actual urea injection volume M ad , upstream NO x concentration, downstream NO x Concentration, running time t i , post processor back pressure and fault information. Through the selection and calculation of specific parameters, the efficient switching of various operating modes of the engine is realized in the development and design stage of the engine, and the engine operating mode can be switched according to the actual road spectrum of the vehicle, that is, the common operating conditions of the engine. Crystallization risk and NO x The low conversion efficiency operating condition identification method switches the engine operating mode for these two operating risks, so as to realize the efficient and safe operation of the engine.

Description

technical field [0001] The invention relates to the field of engines, in particular to a method for controlling engine operation modes. Background technique [0002] Currently, with emission regulations on NO x Limits and fuel consumption regulations are becoming increasingly stringent, and performance development has an impact on bare engine NO x The requirements for fuel consumption and fuel consumption are getting higher and higher, and the demand for specific engine development based on the common working conditions of the whole vehicle is getting higher and higher. However, since the development stage cannot take into account all vehicle applications, it is impossible to make the development stage take into account all operating conditions. In the development stage of engine emission, in order to solve the problem of fuel consumption, the exhaust temperature of the engine is generally developed to be low, and at the same time the NO x The lift of the bare metal is re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N3/28F01N9/00F01N11/00
CPCF01N3/208F01N3/28F01N9/00F01N11/002F01N2900/08F01N2900/1411F01N2900/1806F01N2610/02Y02T10/12Y02T10/40Y02A50/20
Inventor 陆晓燕陈勤学吴峰胜任学成陈灿玉郭际家
Owner FAW JIEFANG AUTOMOTIVE CO
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