Method and device for calculating virtual pressure behind throttle valve
A throttle and pressure technology, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as difficulty in measuring effective pressure, large front and rear pressure, and many pressure interference factors, so as to improve emissions and economy, The effect of improving accuracy
Active Publication Date: 2021-09-03
WEICHAI POWER CO LTD +1
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Problems solved by technology
1) Under transient working conditions, the pressure behind the throttle is disturbed by many factors, and it is difficult to measure the effective pressure of the calculated flow, which affects the accuracy of flow calculation
2) When the throttle opening is large, the front-to-back pressure ratio is large, and it is in the non-linear region, and the calculation accuracy of the actual intake flow is poor
Method used
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Embodiment Construction
[0022] The core of the invention is to provide a method and device for calculating the virtual pressure after the throttle valve, so as to improve the calculation accuracy of intake air flow.
[0023] A gas engine uses natural gas as a raw material, and air and gas are mixed into the cylinder to burn for work. At present, the intake system of a gas engine adopts an intake Venturi device, and the intake Venturi device integrates the throttle valve 100 and the nozzle 200 together, such as figure 1 shown. When working, the air flows into the throttle valve 100 from the throttle valve inlet 101, and enters the nozzle inlet 201 through the throttle valve outlet 102, and the gas enters the nozzle pipe 200 from the gas inlet 202 to fully mix with the air, and the mixed gas is then discharged from the nozzle nozzle 203 outflow. Among them, the pre-throttle pressure P1, the pre-throttle temperature T1, the nozzle outlet pressure P3 and the nozzle outlet temperature T3 are obtained by...
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The invention discloses a method and device for calculating virtual pressure behind a throttle valve. The method comprises the steps: calculating the steady-state pressure P2(t) of a nozzle inlet under the steady-state working condition; calculating the transient pressure delta(P2(t + 1)) of a nozzle inlet under the transient working condition, and calculating the virtual pressure P2(t + 1) = P2(t) + delta(P2(t + 1)) after the throttle valve is calculated. According to the method, the steady-state pressure P2(t) of a nozzle inlet under the steady-state working condition is calculated; according to the method, the throttle valve rear virtual pressure P2(t + 1) = P2(t) + delta(P2(t + 1)) can be finally calculated by calculating the throttle valve rear virtual pressure and calculating the throttle valve flow and the spray pipe flow through the throttle valve rear virtual pressure, so the accuracy of the air inlet flow is improved, the control of the air-fuel ratio of an engine is facilitated, and the emission and economy of the engine are improved.
Description
technical field [0001] The invention relates to the technical field of gas engines, in particular to a method and device for calculating virtual pressure after a throttle. Background technique [0002] The gas engine controls the amount of air entering the engine through the throttle, and injects the corresponding natural gas into the intake air according to the calculation, so as to realize the precise control of the engine power and air-fuel ratio. The accuracy of the calculation of the air volume directly affects the control of the air-fuel ratio, and the air-fuel ratio directly affects the emission and economy of the engine. In the prior art, the actual intake air flow is mainly calculated through the throttle opening and the front-rear pressure ratio. 1) Under transient working conditions, the pressure behind the throttle is subject to many interference factors, and it is difficult to measure the effective pressure for calculating the flow rate, which affects the accur...
Claims
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IPC IPC(8): G06F30/28G06F30/17G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F30/17G06F2113/08G06F2119/14G06F2111/10Y02T10/30
Inventor 鹿文慧李云霞江楠张家林王盼盼
Owner WEICHAI POWER CO LTD