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Engine exhaust temperature control method and engine

A control method and engine technology, applied in engine control, combustion engine, machine/engine, etc., can solve problems such as low engine output power and affecting user experience

Pending Publication Date: 2021-09-03
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But once the torque limit control command is executed, the engine output torque will be limited, making the engine output power smaller, thus affecting the user experience

Method used

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  • Engine exhaust temperature control method and engine
  • Engine exhaust temperature control method and engine
  • Engine exhaust temperature control method and engine

Examples

Experimental program
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Embodiment 1

[0044] In order to ensure the normal driving of the vehicle, various operating parameters of the engine need to cooperate with each other to ensure the reliability and stability of the engine. One of the important parameters that characterize the working state of the engine is the engine exhaust temperature. As the name implies, the engine exhaust temperature is the exhaust temperature of the engine. Air temperature, in other words, refers to the temperature within the exhaust manifold of an engine. If the exhaust temperature of the engine is high, it will easily cause damage to structures such as the exhaust pipe and the supercharger. In the prior art, the torque limit is used to control the exhaust temperature of the engine, but the torque limit will directly reduce the output power of the engine and affect the user's use.

[0045] To solve this problem, such as figure 1 As shown, this embodiment provides an engine exhaust temperature control method, which includes the foll...

Embodiment 2

[0057] The steps in this embodiment are similar to those in Embodiment 1, and the difference lies in how to determine whether the EGR control exhaust temperature mode and the torque limit control exhaust temperature mode are turned off.

[0058] Among them, the first-stage exhaust temperature opening preset value T1 is the opening temperature for starting the EGR control exhaust temperature mode. With the operation of EGR, the actual exhaust temperature T of the engine gradually decreases. It can be understood that if the EGR control exhaust temperature mode is continued, the actual exhaust temperature T of the engine also tends to decrease gradually, so as to reach the safe range of the engine exhaust temperature.

[0059] To this end, the following steps are included after starting the EGR control exhaust temperature mode:

[0060] Compare the actual exhaust temperature T of the engine and the preset value T11 of the first exhaust temperature off, wherein the preset value of...

Embodiment 3

[0082] This embodiment is similar to the second embodiment, the only difference is that, on the basis of the second embodiment, this embodiment adds specific operation steps of the EGR control exhaust temperature mode.

[0083] As the main purification method in the engine, EGR has a great influence on the combustion temperature in the cylinder. With the increase of the EGR rate, the transient maximum temperature and average temperature in the cylinder decrease accordingly. Since high temperature environment is a necessary condition for NOx generation, the increase of EGR rate is beneficial to reduce NOx emission, which is one of the effective ways to reduce NOx emission.

[0084] Among them, the EGR rate is specifically the ratio of the amount of exhaust gas used for recirculating exhaust gas to the total amount of intake air sucked into the cylinder. The reasonable control of the EGR rate is extremely important for the purification effect of nitrogen oxides and the emission o...

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Abstract

The invention belongs to the technical field of vehicles, and discloses an engine exhaust temperature control method and an engine. The engine exhaust temperature control method comprises the following steps that the actual exhaust temperature T of the engine is obtained; the actual exhaust temperature T of the engine, the first-stage exhaust temperature starting preset value T1 and the second-stage exhaust temperature starting preset value T2 are compared, and the first-stage exhaust temperature starting preset value T1 is smaller than the second-stage exhaust temperature starting preset value T2; when T is larger than or equal to T1 and smaller than or equal to T2, the EGR control exhaust temperature mode is started, so that exhaust gas is connected into an intake manifold of an engine cylinder; and when T is larger than T2, the torque-limiting exhaust temperature control mode is started, and the fuel injection quantity and the air inflow of the engine are limited. According to the engine exhaust temperature control method, different exhaust temperature control modes are selected according to the actual exhaust temperature T of the engine to achieve hierarchical control over the exhaust temperature of the engine, compared with the prior art that the exhaust temperature is directly controlled through torque limiting, the control flexibility is improved, the output power of the engine is increased to a certain degree, and the user experience is improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, and in particular, to an engine exhaust temperature control method and an engine. Background technique [0002] Engine exhaust temperature refers to the temperature of the exhaust manifold of the engine. The engine exhaust temperature is one of the important parameters that characterize the combustion state of the engine and is an important factor affecting the reliability and consistency of the engine. When the exhaust temperature of the engine is high, it is easy to cause irreversible effects on the exhaust pipe and the supercharger. Therefore, it is necessary to take corresponding measures to control the engine exhaust temperature to avoid the situation that the engine exhaust temperature is too high. [0003] In order to solve this problem, in the prior art, when the exhaust temperature of the engine is high, the torque limit method is used to control the exhaust temperature of the engine. ...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02D41/30
CPCF02D41/0002F02D41/0052F02D41/30Y02T10/40
Inventor 张红倩江楠张家林王盼盼
Owner WEICHAI POWER CO LTD
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