Engine exhaust temperature control method and device and engine exhaust temperature control system

Abstract

The invention discloses an engine exhaust temperature control method and device and an engine exhaust temperature control system. An ECU obtains the current environment temperature, the current vehicle working condition and the current intercooling temperature; and the ECU inquires and determines an intercooling temperature limit value by utilizing an intercooling temperature limit value mapping relation according to the current environment temperature and the current vehicle working condition, determines that the engine exhaust temperature exceeds an exhaust temperature safety value when determining that the current intercooling temperature exceeds the intercooling temperature limit value, and performs cooling control on the engine exhaust temperature, and damage to components such as a combustion chamber and an exhaust pipe of an engine and environmental pollution due to the over-high exhaust temperature of the engine are avoided. Due to the fact that the above control process is executed by the ECU of the existing equipment, other additional equipment does not need to be added, the engine exhaust temperature can be accurately controlled on the premise that the additional equipment is not added, and the temperature control difficulty of the engine exhaust temperature control system and the production cost of the engine exhaust temperature control system are reduced.

Description

technical field [0001] The present application relates to the technical field of vehicles, in particular to an engine exhaust temperature control method, device and engine exhaust temperature control system. Background technique [0002] In the face of increasingly stringent emission regulations, the exhaust temperature of the engine (abbreviated as: engine exhaust temperature) needs to be strictly controlled, and the high exhaust temperature of the engine will easily cause damage to the combustion chamber and exhaust pipe of the engine. Therefore, , in order to make the exhaust temperature of the engine comply with the emission regulations and protect the safety of the engine, it is necessary to control the exhaust temperature of the engine within the safe value of the exhaust temperature. [0003] At present, in the engine exhaust temperature control system, the exhaust temperature of the engine is usually controlled by means of a throttle valve or a cooling device (for ex...

AI Technical Summary

Problems solved by technology

Among them, since the throttle valve installed at the engine intake port reduces the exhaust temperature of the engine by greatly increasing the intake air volume, the excess air coefficient is greatly increased. Therefore, when the excess air coefficient is too large, it is easy to cause insufficient combustion in the engine. The particulate matter in the exhaust gas will increase, which will easily lead to an increase in waste of resources and an increase in environmental pollution

In addition, both of the above two engine exhaust temperature control systems need additional throttle valves or cooling devices to achieve cooling control of the engine exhaust temperature, which not only increases the difficulty of temperature control of the engine exhaust temperature control system, but also increases the Production cost of engine exhaust temperature control system

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