Knock control system and method of hybrid vehicle

Abstract

The invention provides a knock control system and method of a hybrid vehicle. The knock control system is electrically connected with an engine and a power supply respectively. The knock control system comprises a detection unit, an arithmetic unit, a power supply management unit and a control module. The detection unit is used for detecting vibration intensity of the engine and outputting a knock voltage signal to the arithmetic unit. The arithmetic unit is used for converting the knock voltage signal to a knock intensity value and sending the knock intensity value to the control module. Thepower supply management unit is used for calculating generation power formed by converting output power of the engine and sending the generator power to the control module. The control module is usedfor adjusting an ignition angle of the engine according to the knock intensity value and the generation power. According to the knock control system and the control method disclosed by the invention,the ignition angle can be effectively prevented from being reduced in the event of having a false knock; and the fuel utilization rate and the generation power of the engine are improved.

Description

Technical field [0001] The invention belongs to the technical field of hybrid power control systems, and particularly relates to a knock control system and a control method for a hybrid vehicle. Background technique [0002] At present, part of the power on hybrid vehicles is provided by the internal combustion engine converting fuel energy into electrical energy. If the mixed gas in the internal combustion engine is ignited prematurely before the piston reaches the top dead center, a shock wave will be generated in the combustion chamber to make the cylinder pressure fast Ascends, produces violent gas vibration, forming a knock. Knock is an abnormal combustion phenomenon in internal combustion engines. If severe knocks continue to occur, it will cause severe wear of the engine cylinder and various parts, and even quickly scrap the engine. Therefore, a knock control system is required to prevent the internal combustion engine from knocking. The existing knock control system main...

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Problems solved by technology

The existing knock control system mainly uses the knock sensor to detect the knock signal to determine whether knock occurs, and at the same time adjusts the ignition angle based on the strength of the knock signal. The appropriate ignition angle is the maximum output torque of the engine, and will not The knocking of the internal combustion engine occurs, but because the knocking sensor converts the vibration of the engine into an electrical signal to obtain a knocking signal, the engine may have a relatively large knocking due to other parts or mechanical vibrations, and the knocking is not due to The internal combustion engine knock caused by the premature ignition of the mixed gas in the internal combustion engine before the piston reaches the top dead center is false knocking, so the ignition angle of the internal combustion engine is reduced according to the false knocking, which also causes the output torque of the engine to decrease , the power performance of the engine is reduced, thereby reducing the fuel economy of the hybrid vehicle

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