Air inflow detecting method for engine cylinder
A technology of engine cylinder and intake air flow, applied in engine control, machine/engine, electrical control, etc., can solve the problem of complex working process, inability to accurately estimate the cylinder intake flow of independent dual VVT engine, etc., to achieve a simple calibration process , ease of implementation, and improved accuracy
Active Publication Date: 2013-02-06
HANGZHOU BRANCH ZHEJIANG GEELY AUTOMOBILE RES INST +2
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Problems solved by technology
Although this method provides a low-cost charge estimator to obtain cylinder air estimation without using an air mass flow sensor, the air flow estimation method has a complicated working process and cannot accurately estimate the cylinder intake flow of an independent dual VVT engine
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[0022] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.
[0023] like figure 1 As shown, the engine cylinder air intake flow detection method, the engine ECU 1 respectively receives the intake VVT camshaft position sensor 2 for detecting the intake VVT phase, and the exhaust VVT camshaft position sensor for detecting the exhaust VVT phase 3. Signals sent by the intake manifold pressure sensor 4 for detecting the intake manifold pressure and the rotational speed sensor 5 for detecting the engine speed, and assign these signals to the cylinder intake air flow model in the engine ECU 1, and The cylinder intake flow is obtained by the cylinder intake flow model.
[0024] Among them, the cylinder intake flow model is as follows:
[0025] m ...
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The invention provides an air inflow detecting method for an engine cylinder and belongs to the technical field of engines. The air inflow detecting method for the engine cylinder solves the problem of inaccuracy of flow estimation of a cylinder of an independent double-VVT (variable valve timing) engine in the prior art. The air inflow detecting method for the engine cylinder includes: receiving signals through an ECU (electronic control unit) of the engine, valuating a cylinder air inflow model in the ECU of the engine after processing the signals and obtaining the air inflow of the cylinder via the cylinder air inflow model, wherein the signals are conveyed by an air inflow VVT cam shaft position sensor used for detecting air inflow VVT phase, an exhaust VVT cam shaft positioning sensor used for detecting exhaust VVT phase, an air inflow manifold pressure sensor used for detecting pressure of air inflow manifolds, and a rotation speed sensor used for detecting rotation speed of the engine. The air inflow detecting method for the engine cylinder is capable of accurately estimating cylinder air inflow of the independent double-VVT engine on different working conditions, is high in accuracy and easy to implement.
Description
technical field [0001] The invention belongs to the technical field of engines, and relates to a method for detecting intake air flow of an engine cylinder. Background technique [0002] Engine variable valve timing technology, referred to as VVT, is one of the new technologies that have been gradually applied to modern cars in recent years. The VVT variable valve timing system controls the engine cam The phase of the valve is adjusted, so that the valve opening and closing time changes with the engine speed, the intake charge is increased, the charge coefficient is increased, and the torque and power of the engine can be further improved. [0003] In addition, the cylinder intake flow information plays a very important role in the engine's electronic control unit (ECU). Only through the correct cylinder air intake flow information, the electronic control unit can match the correct fuel injection quantity, so that the air-fuel ratio of combustion in the cylinder is close ...
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IPC IPC(8): F02D41/18
Inventor 屈铮杨安志金吉刚任颖睦赵福全
Owner HANGZHOU BRANCH ZHEJIANG GEELY AUTOMOBILE RES INST