CN112504690B

CN112504690B - Minimum curve test method for fuel consumption rate of engine

Info

Publication number: CN112504690B
Application number: CN202110072922.3A
Authority: CN
Inventors: 杜福银
Original assignee: Xihua University
Current assignee: Xihua University
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2023-02-24
Anticipated expiration: 2041-01-20
Also published as: CN112504690A

Abstract

Aiming at the problem of how to quickly test the minimum fuel consumption curve of the engine at low cost when the minimum fuel consumption curve of the engine is optimized, the invention provides a method for quickly testing the minimum fuel consumption curve of the engine at low cost.

Description

Minimum curve test method for fuel consumption rate of engine

Technical Field

The invention relates to a measurement technology, in particular to a method for testing a minimum curve of fuel consumption rate of an engine.

Background

The invention discloses a method for improving the fuel efficiency of an engine, which adopts the actual throttle opening of the engine as a throttle opening determined by an electronic throttle output signal and a throttle opening weighting result method of the engine rotating speed determined according to the minimum principle of the fuel consumption rate to improve the fuel efficiency of the engine, wherein the actual throttle opening can be regarded as a control result of a weighting throttle signal.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problem that when a weighted accelerator is adopted as an automobile engine accelerator, the minimum curve of the fuel consumption rate of the engine can be tested quickly and at low cost.

Technical scheme

The method for off-line testing the minimum curve of the fuel consumption rate of the vehicle comprises the steps of controlling an electric signal output by a traditional electronic accelerator pedal and fixing the electric signal on V1, controlling a loading device of a dynamometer on a chassis of the vehicle, enabling the rotating speed of an axle to be sequentially stabilized at different values within an allowable range from small to large, searching the rotating speed N1 of the engine when the fuel consumption rate of the engine is minimum, determining a point on the minimum curve of the fuel consumption rate through (V1, N1), sequentially changing the electric signal output by the accelerator pedal and stabilizing the electric signal at V2, V3, once.once.vm, sequentially searching the steady rotating speed N2, N3, once.once.Nm when the fuel consumption rate is minimum, fitting the curves of the m points ((V1, N1), (V2, N2), (V2, N2), once.once.consumption, (Vm, nm)) to obtain the minimum curve of the fuel consumption rate, calculating the fuel by adopting a real-time set value when the fuel consumption rate is calculated, and weighing the circuit board controller of the accelerator to participate in actual operation.

Beneficial effects

When the technical scheme is adopted, the fact that the accelerographs of hundreds of millions of automobiles kept in the market are changed into the weighted accelerographs can be realized, the effects of energy conservation and emission reduction can be very obvious in the future, the cost is low, and the method is simple and easy to implement.

Detailed Description

The minimum curve of the fuel consumption rate of the engine is the corresponding relation between the instantaneous fuel injection quantity of the engine and the engine rotating speed when the fuel consumption rate of the engine is minimum, the fuel injection quantity is set by the rotating speed of the engine based on the minimum curve of the fuel consumption rate in an open-loop control mode, and the output signal of the oxygen sensor is disconnected when the minimum curve of the fuel consumption rate is tested.

The basic real-time set value of the fuel injection quantity is as follows:

（1）

in the above formula:

is the amount of intake air,

is a constant of proportionality that is,

the engine rotating speed, the real-time set value of the fuel injection quantity after the fuel quantity is corrected and increased is considered as follows:

（2）

in the above formula:

is the correction oil amount coefficient of the oil amount,

，

is to increase the oil mass coefficient of the oil,

the test is that after the engine is started, the warm-up process is finished, the place is unchanged, the duration is short, the throttle opening is sequentially fixed to different values, and the speed value of each throttle opening with the minimum fuel consumption rate and the steady state is searched under the condition that the engine load is changed to change the rotating speed of the engine, so that the parameter of each point on the test curve in the process is measured

Is a constant.

Instantaneous fuel consumption rate of

（3）

In the above formula:

is the set value of the instantaneous fuel injection quantity, when a curve is tested by an automobile chassis dynamometer,

the instantaneous output power of the dynamometer is converted into the power of the output end of the engine,

the instantaneous output torque of the dynamometer is converted into the torque at the output end of the engine,

the instantaneous output rotation speed of the dynamometer is converted into the rotation speed of the output end of the engine, and a certain air input is searched under the condition that the mechanical transmission efficiency is determined

I.e. actual throttle opening

At constant, different rotational speeds

Is equivalent to finding

The maximum value of (a) is,

maximum engine speed

With actual throttle opening

Determining a point on the curve, and sequentially changing the actual throttle valve

Fixing, and finding the rotation speed corresponding to the minimum fuel consumption rate

And determining other points on the curve, fitting the curve of the points, downloading curve data into a weighted throttle circuit board controller during actual operation, acquiring an engine rotating speed signal by the circuit board controller in real time, determining an optimal throttle opening signal based on the minimum fuel consumption curve, and weighting the optimal throttle opening signal with a signal of a traditional electronic throttle to serve as an actual throttle control signal.

The relation between the air inflow and the opening of the throttle valve, the opening of the throttle valve and the electric signal output by the throttle valve are in one-to-one correspondence, and a controllable analog electric signal can be used for replacing the electric signal output by the throttle valve to test a curve with the minimum fuel consumption rate during testing, namely the corresponding relation curve between the electric signal output by the throttle valve and the rotating speed of the engine when the fuel consumption rate of the engine is minimum.

Claims

1. A method for testing an engine fuel consumption rate minimum curve is characterized in that in the testing process, a real-time set value is adopted for fuel consumption when fuel consumption rate is calculated, an electric signal output by a traditional electronic accelerator pedal is controlled and fixed on V1, a loading device of an automobile chassis dynamometer is controlled, axle rotating speeds are enabled to be sequentially stabilized in different values within an allowable range from small to large, engine rotating speeds N1 when the engine fuel consumption rate is minimum are searched, a point on the fuel consumption rate minimum curve can be determined through (V1, N1), the electric signal output by the accelerator pedal is sequentially changed and stabilized on V2, V3,.