JPH0434332A - Detecting apparatus for deterioration of engine - Google Patents

Abstract

PURPOSE:To detect an output horsepower of an engine highly precisely and to evaluate deterioration by determining an acceleration due to a driving capacity of the engine and by calculating a driving force on the basis of the acceleration and the amount of inertia at a transient time point necessitating evaluation on an age basis in an endurance test. CONSTITUTION:A speed signal and the amount of inertia loaded on a machine to be tested are inputted from a testing system 20. In a driving force computing element 11, accelerations of a vehicle speed at transient time points T1, T2... Tn necessitating evaluation on an age basis are determined from speed sections V1 to V2, V2 to V3... Vn-1 to Vn and driving forces F1, F2... Fn at the transient time points T1, T2... Tn are calculated sequentially. Each of the driving forces F1, F2... Fn is inputted to a horsepower modification computing element 12, and this element 12 executes modifying computation corresponding to the kind of the body to be tested and executes correction to a standard state by a temperature signal and an atmospheric pressure signal. A horsepower data storing element 13 stores data P1, P2 to Pn on the modified horsepower as occasion calls. A data comparison computing element 14 calculates the amount of deterioration on the basis of the stored data and conducts evaluation on an age basis.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of Application The present invention relates to an engine deterioration pressure detection device for evaluating an engine over time in a test system using an engine as a driving source, and particularly to The present invention relates to an engine deterioration detection device that performs accurate quantitative evaluation.

B0 Summary of the Invention The present invention provides an engine deterioration detection device for evaluating an engine over time in a test system using an engine as a driving source, which detects speed signals and inertia detected from the test system at each transition point that requires evaluation over time. A driving force calculation unit that calculates the driving force based on the quantity, a horsepower correction calculation unit that converts the driving force into a standard value based on the type of specimen and atmospheric conditions, and a horsepower data storage unit that stores the corrected horsepower data at any time. and a data comparison calculation unit that performs longitudinal evaluation by comparing data at each transition point.This enables verification to be performed in parallel with durability tests without the need for a test bench or incidental equipment for engine evaluation. The objective is to provide a technology that enables accurate and quantitative evaluation over time and contributes to shortening testing time and saving manpower.

C1 Conventional Technology Tests of completed vehicles, power trains, etc. are naturally conducted using their engines as the driving source. There are generally two types of testing systems:

FIG. 3 is a configuration diagram showing an example of a test system. In the figure, a car 31 is placed on rollers to transmit the rotation of its wheels, and the rotation is transmitted to an absorber 33 via a flywheel 32. The absorber 33 is controlled by an absorber control panel 34, the automobile 31 is controlled by a vehicle system panel 35, and a program command section 36 controls them to perform the test.

FIG. 4 is a configuration diagram showing another example of the test system. In the figure, an automobile engine 41 itself is connected to a flywheel 42, and its rotation is transmitted to an absorber 43. The absorber 43 is controlled by an absorber control panel 44, the engine 41 is controlled by an engine control panel 45, and a program command section 46 controls them to perform the test.

D1 Problems to be Solved by the Invention However, in the conventional test system described above, there was no method for easily verifying engine deterioration during a durability test (acceleration/deceleration test). Although it is extremely important to evaluate the engine over time even during testing, conventionally there was no equipment available for evaluating acceleration performance, and the evaluation was limited to qualitative evaluations.If you want to understand detailed output characteristics, However, the engine had to be transferred to a different test bench capable of measuring the engine's output characteristics and then subjected to regular tests for evaluation, which wasted a great deal of effort and time, and there were also doubts about its accuracy.

The present invention was devised in view of these problems, and does not require a test bench or incidental equipment for engine evaluation.
The objective is to provide an engine deterioration detection device that can be verified in parallel with durability tests, performs accurate and quantitative evaluation over time, and contributes to shortening testing time and manpower.

Means for Solving the E0 Problem The means for solving the above problem in the present invention is a test system using an engine as a drive source, and an engine deterioration detection device that performs a secular evaluation of the engine during the test. A driving force calculation unit that calculates the driving force from the speed signal and inertia detected from the test system at each transient point that requires evaluation, and a horsepower correction that converts the driving force to a standard value based on the type of specimen and atmospheric conditions. The engine deterioration detection device is composed of a calculation unit, a horsepower data storage unit that stores calculated corrected horsepower data as needed, and a data comparison calculation unit that performs a secular evaluation by comparing data at each transition point. It is something.

F Effect The present invention aims to detect engine output horsepower with high accuracy even during a transient period during a test and evaluate deterioration.

The present invention calculates the acceleration due to the driving capacity of the engine at that time at a transitional point during a durability test that requires evaluation over time, calculates the driving force from the acceleration and the amount of inertia, and multiplies this by the speed. Calculate the engine output. Furthermore, by converting this into standard conditions based on the type of specimen and atmospheric conditions, the engine output can be calculated with high accuracy.

G. Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of the present invention.

In the figure, 10 is an engine deterioration detection device of the present invention, and 20 is a test system using an engine as a driving source, as shown in FIGS. 3 and 4.

The engine deterioration detection device 10 is composed of a driving force calculation section 11, a horsepower correction calculation section 12, a horsepower data storage section 13, and a data comparison calculation section 14. The amount of inertia to be applied is input.

In the driving force calculation unit II, the acceleration of the vehicle speed at the transient time points T+, Tt...T1, which require evaluation over time, is calculated as the speed interval V+.
~Vt, Vt~Va-V, , -+~V7, and the driving force is calculated from the known formula %.

In the test system shown in FIG. 3, the driving forces P , , F at transient times T, , T, . . . T are determined by the following equation.

...Calculate Fn sequentially.

However, F = driving force (kg) W - system inertia (kg) g = acceleration of gravity (m/sec") dV, - amount of speed change (km / h) dt, - time required for speed change ( sec) FDY - Load weight of test machine (kg) FML - Mechanical loss weight of the system (kg).

Each of the driving forces F, F,...Fn is input to the horsepower correction calculation unit I2, and the horsepower correction calculation unit 12 calculates the , P (KW) - F V / 3600 Make corrections to the condition.

This correction differs depending on the type of engine, such as a gasoline engine, a diesel engine without a turbo, or a diesel engine with a turbo. For example, for a gasoline engine, the following calculation is performed.

P′” K at x P however, P’=corrected horsepower P = measured horsepower P, = atmospheric pressure (m　m　Hg　) P, = water vapor partial pressure (mmHg) θ=Intake air temperature (’C) Also, water vapor partial pressure is determined from dry bulb temperature and wet bulb temperature.

Note that this calculation is normally performed by digital calculation using a microcomputer or the like. And each modified horsepower P,
, P, ~Pn. The horsepower data storage unit 13 stores corrected horsepower data P,,P.

~Pn is stored at any time up to the date %lIlkoNo, 1-No, and n data. The data comparison calculation unit 14 calculates the amount of deterioration based on the stored data and performs a secular evaluation.

FIG. 2 is a characteristic diagram illustrating a comparison of the amount of deterioration, in which the vertical axis shows horsepower P and the horizontal axis shows vehicle speed V. In the figure, ■ is No. 1 data, ■ is No. 002 data, ■ is No.
, 3 data are shown.

There are two ways to think about the amount of deterioration: (1) one that determines how much the engine has deteriorated from its initial state; for example, using ■ in the diagram as a reference, ■−■■−■, ~■
When calculating -■, (2) Grasping the progress of deterioration, for example, when calculating ■-■, ■-■, ~0-■ for each data in the figure.

In this embodiment, the data comparison calculation unit 14 selects vehicle speeds to be compared at certain intervals (V r, V t, V s, etc.) (for example, in 10 km/h increments such as 0-10-20...). Compare the engine output horsepower at this vehicle speed. Then, the deterioration value, , t is calculated as follows, and the final evaluation is determined to be abnormal when Knl≧A.

However, the value A corresponding to i=0.10.20 - evaluation reference value In this way, the data comparison calculation unit 14 performs a secular evaluation based on the data stored from time to time, and outputs the amount of deterioration.

This example clearly has the following effects.

(1) Can be verified simultaneously with durability tests.

(2) Long-term evaluation can be performed quantitatively and accurately.

(3) Improved test time reduction and labor savings.

(4) The test bench and incidental equipment required for evaluation are no longer required.

Effects of H1 Invention As explained above, according to the present invention, there is no need for test benches or incidental equipment for engine evaluation, verification can be performed in parallel with durability tests, and aging can be performed quantitatively with high accuracy. It is possible to provide an engine deterioration detection device that performs evaluation and contributes to shortening test time and saving labor.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a characteristic diagram of the amount of deterioration, and FIGS. 3 and 4 are block diagrams of a test system. lO...Engine deterioration detection device, 1 calculation section, 12...horsepower correction calculation section, 13 storage section, 14.
...Data comparison calculation section, stem. l...Driving force performance...Horsepower data 20...Test figure 2: Explanatory diagram for comparison of amount of deterioration

Claims (1)

[Claims] (1) In an engine deterioration detection device that evaluates the engine over time during a test using a test system that uses an engine as a driving source, it is determined based on the speed signal and inertia detected from the test system at each transition point that requires the evaluation over time. a driving force calculation unit that calculates the driving force; a horsepower correction calculation unit that converts the driving force into a standard value based on the type of specimen and atmospheric conditions; and a horsepower data storage unit that stores the corrected horsepower data from time to time; An engine deterioration detection device comprising: a data comparison calculation section that performs a secular evaluation by comparing data at each transition point.