EGR rate computing method and system and vehicle

Abstract

The invention provides an EGR rate computing method and system and a vehicle. The method comprises the following steps: acquiring an actual volume flow rate of gas entering an engine cylinder; detecting the gas inlet pressure and gas inlet temperature of an engine; obtaining the amount of substance of the gas according to the actual volume flow rate, the gas inlet pressure, the gas inlet temperature and a gas constant of the gas; obtaining the amount of substance of fresh air entering the engine cylinder according to the flow rate of the fresh air entering the engine cylinder and the molar mass of air; and obtaining an EGR rate according to the amount of substance of the gas and the amount of substance of the fresh air. The EGR rate can be simply and efficiently computed according to the method provided by the invention, and the working condition of the engine can be corrected in real time according to the computed result to improve the stability of oil consumption and discharge of the engine during instant operation.

Description

technical field

[0001] The invention relates to the technical field of automobiles, in particular to an EGR rate calculation method, system and vehicle. Background technique

[0002] Currently, the engines of petroleum-based vehicles have high fuel consumption, large emissions, and low thermal efficiency. Its control system generally does not calculate and actually control the EGR rate. The control of a few systems is also based on the EGR rate in the traditional sense, that is, the ratio of the recirculated exhaust gas volume to the total intake air volume. This value is used in existing engines. The test equipment is difficult to measure, that is, it is difficult to determine the composition of the intake air under different working conditions, which leads to the difficulty of calibration work, and in the theoretical derivation, the determination of the EGR rate requires More complex and less accurate models, which greatly increase the difficulty of calibration work and a...

Examples

Embodiment Construction

[0029] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0031] figure 1 is a flow chart of a method for calculating an EGR rate according to an embodiment of the present invention.

[0032] In the following description, the engine is, for example, an engine based on petroleum fuel.

[0033] Such as figure 1 As shown, the calculation method of the EGR rate according to an embodiment of the present invention includes the following steps:

[0034] S1: Obtain the actual volumetric flow of gas entering the cylinders of the engine.

[0035] In one embodiment of the present invention, as figure 1 shown, combined with figure 2 , the above step S1 is selected to obtain the actual volume flow of the gas entering the engine cylinder, further comp...

technical field

[0001] The invention relates to the technical field of automobiles, in particular to an EGR rate calculation method, system and vehicle. Background technique

[0002] Currently, the engines of petroleum-based vehicles have high fuel consumption, large emissions, and low thermal efficiency. Its control system generally does not calculate and actually control the EGR rate. The control of a few systems is also based on the EGR rate in the traditional sense, that is, the ratio of the recirculated exhaust gas volume to the total intake air volume. This value is used in existing engines. The test equipment is difficult to measure, that is, it is difficult to determine the composition of the intake air under different working conditions, which leads to the difficulty of calibration work, and in the theoretical derivation, the determination of the EGR rate requires More complex and less accurate models, which greatly increase the difficulty of calibration work and a...

Examples

Embodiment Construction

[0029] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0031] figure 1 is a flow chart of a method for calculating an EGR rate according to an embodiment of the present invention.

[0032] In the following description, the engine is, for example, an engine based on petroleum fuel.

[0033] Such as figure 1 As shown, the calculation method of the EGR rate according to an embodiment of the present invention includes the following steps:

[0034] S1: Obtain the actual volumetric flow of gas entering the cylinders of the engine.

[0035] In one embodiment of the present invention, as figure 1 shown, combined with figure 2 , the above step S1 is selected to obtain the actual volume flow of the gas entering the engine cylinder, further comp...

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