Car engine electronic air throttle control system and its control method

Abstract

The invention discloses a reliable electronic throttle control system with high position precision, high output force linearity and high response speed for an automotive engine. The invention comprises a power supply, a position transducer and an SCM both of which are connected with an accelerator pedal in turn; an A / D transducer, a PWM output module and a CAN communication control module, which are embedded inside SCM. The CAN communication control module transmits processed digitized signal to a monitoring plant through a CAN communication interface. The PWM output module is connected with a motor drive circuit, transmits the feedback signal of opening of two throttles to the A / D transducer through the throttle bodies; the throttle comprises a DC motor, a throttle valve, two throttle opening sensors, a return spring device and a feedback signal output interface, which are sealed into one piece. The DC motor is connected with the throttle valve through the control interface of the DC motor. The opening signal of the throttle valve is transmitted through the opening sensor of the throttle valve and is fed to the A / D transducer through the feedback information output interface. The direction of the spring force of the return spring always faces towards the closing direction of the throttle valve.

Description

technical field [0001] The invention relates to a control system and a control method for an automobile throttle, in particular to a control system and a control method for an automobile electronic throttle. Background technique [0002] The engine throttle regulating mechanism in the prior art mainly includes two structures of non-electric control and electric control. [0003] The engine non-electric throttle adjustment mechanism is composed of an accelerator pedal with a fixed shaft and a stay wire, one end of the stay wire is connected with the accelerator pedal, and the other end of the stay wire is connected with the engine throttle pull rod. During operation, step on the accelerator pedal with your feet, and pull the accelerator rod through the accelerator cable. The displacement of the throttle rod is also different according to the force of the driver. Therefore, the opening degree of the engine throttle is also different due to the cooperation of the return spring...

AI Technical Summary

Problems solved by technology

[0008] To sum up, the common technical problem of automobile throttle control system in the prior art is that the same control method is adopted for the forward and reverse output control of the throttle body, due to the effect of the return spring in the throttle valve and the friction and other factors complicate the force of the throttle valve and increase the difficulty of control. When the throttle valve rotates in different directions, the tension generated by the main nonlinear spring is different, and the rotation range is also different, resulting in positive and negative rotation. The models are different, and the same control method is used in the forward and reverse directions, which will inevitably lead to the control in one direction, although the opening of the throttle valve can be controlled in time to the desired opening, but the control in the other direction can also control the opening of the throttle valve. If the opening degree is controlled at the desired opening degree, the time used will be extended, resulting in slow response

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