A drive system of vva solenoid valve with close detection function

Abstract

The invention discloses a VVA solenoid valve driving system with a closing detection function, which includes a VVA solenoid valve, a driving module, a current sampling amplifier circuit and a closing detection circuit, and the driving module uses the driving circuit to drive a transistor connected to the VVA solenoid valve state. The present invention utilizes the inherent characteristics of the VVA solenoid valve itself, and when driving the VVA solenoid valve, the operating current of the solenoid valve is changed in a "V" shape in which the sawtooth wave first drops step by step and then the sawtooth wave rises step by step during the rapid increase stage, so that The closed state of the VVA solenoid valve is detected by the closed detection circuit without adding additional sensors, so that the VVA solenoid valve is not only an actuator, but also a sensor, which can realize the closed state detection of the solenoid valve and adjust the driving timing of the solenoid valve. It is helpful to improve the idling stability of the internal combustion engine, increase the torque in low-speed conditions, ensure the power performance in high-speed conditions, and improve the fuel economy at low speeds and small loads.

Description

technical field [0001] The invention relates to a VVA solenoid valve drive system with a closing detection function, belonging to the technical field of VVA solenoid valves. Background technique [0002] A variable valve actuator (abbreviation: VVA) solenoid valve is a normally open valve commonly used in internal combustion engines. The state of the VVA solenoid valve (that is, the solenoid valve of the variable valve drive mechanism, the same below) is controlled by the driving current. The process of driving the VVA solenoid valve from the normally open state to the closed state and then back to the normally open state mainly includes excitation, rapid lifting, and maintenance. And open four phases, the current waveform of the corresponding VVA solenoid valve is as figure 1 Shown: [0003] 1) The excitation stage mainly includes the current rising section A and the magnetizing current holding section B. The excitation stage is not long, and it is mainly used to pre-magn...

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Problems solved by technology

[0007] In the above process, the VVA solenoid valve is just a simple actuator, and the state of its working process and the actual complete closing time are uncertain. Although its complete closing time can be obtained by theoretical calculation, it is affected by the inconsistent performance of different VVA solenoid valves, VVA Due to the aging of the solenoid valve or the influence of other external factors, the actual complete closing time of the VVA solenoid valve may be different from the theoretical calculation result, resulting in an inaccurate driving process

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