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Non-road national IV engine TVA calibration method

A calibration method and engine technology, applied in the direction of electric controllers, mechanical parts testing, controllers with specific characteristics, etc., can solve the problems of exhaust temperature difference, DPF burning, DPF can not be regenerated, etc., to achieve the effect of smooth regeneration

Inactive Publication Date: 2020-04-14
TIANJIN LOVOL ENGINES
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] Using the existing technology is not conducive to controlling the exhaust temperature deviation caused by the consistency of the engine or TVA itself, which may cause the same TVA opening to show different exhaust temperatures in different engines or different TVA valves.
If the exhaust temperature is lower than the target value, it may cause the DPF to fail to regenerate; if the exhaust temperature is too high, it may cause the DPF to burn out

Method used

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  • Non-road national IV engine TVA calibration method

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Embodiment Construction

[0019] In order to further understand the invention content, features and effects of the present invention, the following embodiments are exemplified and described in detail with reference to the accompanying drawings.

[0020] see figure 1 , a non-road national IV engine TVA calibration method:

[0021] It is mainly to improve the control and calibration method of TVA opening. The original open-loop control calibration based on the TVA target opening is changed to the closed-loop control calibration based on the pressure closed-loop after intercooling in this scheme.

[0022] The calibration method is as follows:

[0023] 1. Open-loop pre-control calibration. The open-loop control method is used to calculate the steady-state target opening of TVA. Through pre-control, the actual intake flow or pressure after intercooling can better track the target intake flow or pressure after intercooling, so as to further control TVA.

[0024] 2. Calibration of pressure closed-loop con...

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Abstract

The invention, which belongs to the technical field of engines, discloses a non-road national-IV-emission engine TVA calibration method. The method is characterized by comprising the following steps:S1, carrying out open-loop pre-control calibration; to be specific, calculating a steady-state target opening degree of TVA by using an open-loop control method, carrying out pre-controlling, and enabling an actual air inlet flow or an inter-cooled pressure to better track a target air inlet flow or an inter-cooled pressure; S2, carrying out pressure closed-loop control calibration after TVA intercooling; to be specific, adjusting the TVA opening degree based on deviation feedback of a set pressure and an actual pressure to realize a closed loop so as to obtain a TVA target opening degree; andS3, carrying out TVA opening degree self-adaptive control calibration; to be specific, carrying out closed-loop controlling by using a self-adaptive PI controller and a dynamic control DT1 controller. According to the invention, based on closed-loop control calibration of a pressure closed loop after intercooling, the consistency of exhaust temperatures of different engines or different TVA valves during DPF regeneration can be controlled.

Description

technical field [0001] The invention belongs to the technical field of engines, in particular to a TVA calibration method for non-road national IV engines. Background technique [0002] As we all know, the TVA (Throttle Valve Actuator) throttle valve actuator is a device that controls the gas flow into the engine by changing the opening of the valve. When the opening is the largest, the gas flow into the engine is the largest. In the calibration, it is defined that when the TVA opening is 0%, the intake air flow is the largest, that is, the valve is fully open; when the TVA opening is 100%, the valve is completely closed, and the engine may stop due to no intake air at this time. In order to comply with non-road country IV emission regulations, non-road country IV engines need to be equipped with an after-treatment system to reduce engine emissions. The usual after-treatment solution is DOC+DPF+SCR; the main function of DPF is to filter the particulate matter in the exhaust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42G01M13/00
CPCG05B11/42G01M13/00
Inventor 高亮
Owner TIANJIN LOVOL ENGINES
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