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Natural gas engine double-output mode control system and control method

A mode control and output mode technology, applied in engine control, electrical control, combustion engine, etc., can solve the problem of not having constant power output mode, and achieve the effect of increasing versatility

Active Publication Date: 2019-10-01
WEICHAI HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In practical applications, there is also a requirement for constant power when driving pumps. Taking water pumps as an example, when the water pressure decreases, the engine speed is required to increase; when the water pressure increases, the engine speed is required to be reduced to basically maintain the output power. Stable; but the current natural gas engine only has a constant speed output mode, not a constant power output mode

Method used

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  • Natural gas engine double-output mode control system and control method
  • Natural gas engine double-output mode control system and control method
  • Natural gas engine double-output mode control system and control method

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Embodiment 1

[0044] Such as figure 1As shown, a natural gas engine dual output mode control system, including natural gas engine a, electronic control unit ECU, speed sensor b, oxygen sensor c and actuator d (throttle valve, gas nozzle and gas valve), the installation position of the above components The electrical connection relationship is well known to those skilled in the art, and will not be repeated here; it also includes: a torque sensor 4 and a switching device; wherein, the torque sensor 4 is arranged on the rotating shaft of the natural gas engine a, and is electrically connected to the electronic control unit ECU Connection; switching device, the switching device is electrically connected with the electronic control unit ECU, and is used to send a constant power running signal or a constant power exit signal to the electronic control unit ECU.

[0045] In this embodiment, the switching device is a manual switch f; the manual switch f is connected in series between the constant p...

Embodiment 2

[0068] The difference between the second embodiment and the first embodiment above is that the switching device is different; the difference of the corresponding control method is that the steps of automatically exiting the constant power output mode are different.

[0069] Figure 4 The principle block diagram of the shown natural gas engine double output control method of the present invention and Figure 5 The specific flow chart of the constant power output control steps shown is applicable to this embodiment.

[0070] Only the differences are detailed below:

[0071] Such as figure 2 and image 3 Commonly shown, the switching device of this implementation is an instrument; the instrument includes a central processing unit CPU electrically connected to the control unit ECU; There is a manual switch s between the positive terminals (port 1), the constant power signal output terminal (port 10) of the central processing unit CPU is connected to the base of the triode T, ...

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Abstract

The invention discloses a natural gas engine double-output mode control system and control method. The system comprises a natural gas engine, an electronic control unit ECU, a rotating speed sensor, an oxygen sensor, an execution mechanism, a torque sensor and a switching device, wherein the switching device is used for sending a constant power operation or exit signal to the electronic control unit ECU. The method comprises the following steps that the constant power operation or exit signal is sent to the electronic control unit ECU through the manual control switching device; when a constant power output mode operates, the electronic control unit ECU calculates to obtain actual power and outputs power curve based on the torque sensor and the rotating speed sensor, and the electronic control unit ECU controls and adjusts air intake quantity through a PID based on the power curve; gas injection quantity is synchronously adjusted based on the current air intake quantity and target air-fuel ratio; and constant power is operated. The natural gas engine can be compatible with two output modes of the constant power and constant rotating speed, the requirement of a user for the constantpower is met, and the universality is increased.

Description

technical field [0001] The invention belongs to the technical field of natural gas engines, and in particular relates to a dual output mode control system and control method for natural gas engines. Background technique [0002] When a natural gas engine is matched with a fixed power such as driving a water pump, it generally adopts a control logic similar to that of a generator set, that is, the speed is kept constant regardless of the load change; Unit ECU control, no additional torque parameter input required. [0003] In practical applications, there is also a requirement for constant power when driving pumps. Taking water pumps as an example, when the water pressure decreases, the engine speed is required to increase; when the water pressure increases, the engine speed is required to be reduced to basically maintain the output power. Stable; but the current natural gas engine only has a constant speed output mode, not a constant power output mode. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D29/00F02D29/04F02D19/02F02D45/00
CPCF02D29/00F02D29/04F02D19/02F02D31/001Y02T10/30
Inventor 李杰宋杰张文杰田书广
Owner WEICHAI HEAVY MACHINERY
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