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A Fuel Pressure Controller Based on Active Disturbance Observation and Its Control Method

A disturbance observer, fuel pressure technology, applied in engine control, fuel injection control, electrical control and other directions, can solve the problems of performance degradation, backward interference effect of PID controller adjustment process, insufficient compensation, etc., to achieve good static performance and Dynamic performance, solving fluctuation tracking and compensation problems, reducing the effect of dynamic deviation

Active Publication Date: 2016-08-17
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

(2) During the transient process, the fuel pressure changes sharply and frequently
Due to the complexity, time-varying and non-linear problems of the internal combustion engine fuel injection system, with the change of engine speed, load and other operating conditions, its internal parameters have changed greatly, which makes the PID control performance insufficient to compensate Changes in fuel injection system parameters lead to performance degradation and even system instability
[0014] Since the PID control always adjusts after the error has occurred, if the disturbance has occurred but no deviation occurs, the PID controller will not work and adjust, so the adjustment process of the PID controller always lags behind the disturbance, and there is a lag

Method used

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  • A Fuel Pressure Controller Based on Active Disturbance Observation and Its Control Method
  • A Fuel Pressure Controller Based on Active Disturbance Observation and Its Control Method
  • A Fuel Pressure Controller Based on Active Disturbance Observation and Its Control Method

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Embodiment

[0114] Such as Figure 10 As shown, the fuel pressure controller based on active disturbance observation in the present invention is the fuel pressure control effect diagram when it is actually applied in a high-pressure common rail fuel injection system of a six-cylinder diesel engine.

[0115] The six-cylinder diesel engine has a displacement of 11.596L, a rated power of 353kW (corresponding to a diesel engine speed of 2100rpm), and a maximum torque of 1973N m (corresponding to a diesel engine speed of 1200-1500rpm). rail fuel injection system, the maximum injection pressure is 180MPa.

[0116] Fuel pressure controller based on active disturbance observation, execution cycle T O is 0.008s, the observation frequency ω O 3rad / s, control frequency ω C is 18rad / s, the physical property coefficient of the fuel injection system b O for 200.

[0117] PID-based fuel pressure controller, execution cycle T O is 0.008s, proportional coefficient K P is 2, the integral coefficient...

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Abstract

The invention relates to a fuel pressure control method based on active disturbance observation. Aiming at the problems of time-varying, non-linear and unsatisfactory application of traditional PID control in fuel pressure control of the fuel injection system of an internal combustion engine, a model-based feed-forward control and The fuel pressure control is realized by feedback control based on state observation. Mainly include: target fuel pressure calculation, fuel pressure sensor actual fuel pressure acquisition calculation, fuel volume flow rate feedback adjustment calculation of fuel metering unit, fuel volume flow rate feedforward control calculation of fuel metering unit, fuel volume flow rate conversion of fuel metering unit Convert current, fuel metering unit current to PWM duty cycle, fuel metering unit actual working current measurement and calculation, fuel metering unit current feedback regulator, fuel metering unit PWM modulation frequency calculation, fuel metering unit PWM drive, fuel metering unit, fuel oil Injection system and fuel pressure active disturbance observer.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine control, relates to an internal combustion engine fuel injection system, and relates to a fuel pressure control method for the internal combustion engine fuel injection system, in particular to a fuel pressure control method based on active disturbance observation. Background technique [0002] The internal combustion engine is the model with the highest thermal efficiency, the best energy utilization rate, and the most energy-saving model among the various power machinery currently being industrialized. It has been widely used in power generation, irrigation, ship power, vehicle power, etc. The advantage in power is the most obvious, and the global trend of "internal combustion engine" in vehicle power has been formed. [0003] According to the different ignition methods, internal combustion engines can be divided into spark ignition engines (such as gasoline engines, that is, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/04F02D41/30F02D41/20
Inventor 谢辉凌健
Owner TIANJIN UNIV
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