GB/T 19055-2024 English PDF (GBT19055-2024)

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GB/T 19055-2024: Reliability test methods for motor vehicle engines
GB/T 19055-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.01
CCS T 11
Replacing GB/T 19055-2003
Reliability test methods for motor vehicle engines
ISSUED ON: MAY 28, 2024
IMPLEMENTED ON: DECEMBER 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Test engine ... 7
5 General test requirements ... 7
6 Control of general test conditions ... 7
7 Adjustment of engine accessories and systems during the test ... 8
8 Working procedures ... 9
9 Reliability test specifications ... 11
10 Recommended inspection and maintenance ... 15
11 Test result evaluation ... 17
12 Test report ... 18
Appendix A (Normative) Reliability assessment methods for motor vehicle engines 20
Reliability test methods for motor vehicle engines
1 Scope
This document specifies the general reliability test methods and reliability assessment
methods for motor vehicle engine bench test.
This document applies to M and N category motor vehicle engines, which are
reciprocating, rotary type, excluding free piston type.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 1883.1, Reciprocating internal combustion engines - Vocabulary - Part 1:
Terms for engine design and operation
GB/T 15089, Classification of power-driven vehicles and trailers
GB/T 17754, Tribology terminology
GB/T 18297, Performance test code for road vehicle engines
3 Terms and definitions
For the purpose of this document, terms and definitions given in GB/T 15089, GB/T
1883.1, GB/T 17754 and GB/T 18297, as well as the following apply.
3.1
rated speed
The engine speed at rated power.
Note: The rated power is specified by the manufacturer, and the rated speed is
generally lower than the maximum power speed under full load.
3.2
speed of maximum net torque
nM
By GB/T 18297, the speed at which the engine with a full set of vehicle accessories
outputs the maximum effective torque.
3.3
rated net power
By GB/T 18297, the corrected effective power output of the engine with a full set of
vehicle accessories at rated speed and full load.
4 Test engine
The three test engines (numbered A, B, and C) shall comply with the product technical
standards of the engine manufacturer.
5 General test requirements
The accuracy of the instruments used in the test, the measurement locations and the
calculation of the test data shall be in accordance with the provisions of GB/T 18297.
6 Control of general test conditions
6.1 Air intake status
It is recommended to control the air intake temperature within the range of 25 ℃ ±
10 ℃.
6.2 Fuel
The fuel designation shall be in accordance with the regulations of the engine
manufacturer. The gasoline temperature shall be controlled at 25 ℃ ± 5 ℃; the diesel
temperature shall be controlled at 40 ℃ ± 5 ℃; the temperature of other fuels shall be
controlled in accordance with the regulations of the engine manufacturer.
Fuel pressure shall be controlled in accordance with the engine manufacturer's
regulations.
6.3 Engine oil
The engine oil designation shall be in accordance with the regulations of the engine
manufacturer. The engine oil temperature shall not exceed the permissible temperature
specified by the engine manufacturer, otherwise a forced cooling device shall be used.
6.4 Coolant
Use the coolant specified by the engine manufacturer. The coolant outlet temperature
shall be controlled at 95 ℃ ± 3 ℃ or the temperature specified by the engine
manufacturer; during the hot and cold shock test, the coolant temperature shall be
controlled according to the provisions of Table 5.
7 Adjustment of engine accessories and systems during the
test
7.1 Air intake system
Use a standard vehicle intake system or an equivalent laboratory intake system (under
full speed and full load conditions, the resistance difference with the standard intake
system is within ±5%). The intake temperature after intercooling of a supercharged
intercooled engine shall meet the product technical standard requirements of the engine
manufacturer, and the resistance of the intercooler or intercooler simulator under full
speed and full load conditions of the engine shall be equivalent to that of the vehicle
intercooler.
7.2 Exhaust system
Use a standard exhaust system installed on the vehicle or a laboratory exhaust system
with equal resistance (under full speed and full load conditions, the back pressure
difference with the standard exhaust system is within the range of ±2 kPa).
7.3 Cooling system
According to the technical requirements of the engine manufacturer, the maximum
power fan for the vehicle is selected (for the clutch fan, the clutch shall be locked to
achieve the effect of direct connection to the fan), and an external blower can be used
to blow the engine. The vehicle cooling system components or other equivalent
components shall be installed, and the cooling system pressure, radiator resistance and
coolant flow value shall meet the product technical standards of the vehicle and engine
manufacturer. The thermostat shall be set to the fully open position.
7.4 Ignition system
The ignition angular advance of the spark-ignition engine shall be in accordance with
the regulations of the engine manufacturer.
7.5 Power generation system
The vehicle-mounted generator, voltage regulator and battery (if any, fully charged) etc.
shall be installed and in working condition.
7.6 Accessory system
Test the net power (or total power), piston leakage and oil consumption in accordance
with the provisions of GB/T 18297, and select test conditions in accordance with the
provisions of the engine manufacturer.
8.4 Reliability test
Proceed as per Chapter 9.
8.5 Performance retest
Repeat 8.3.
8.6 Disassembly and inspection
Dismantle and inspect engine A, engine B and engine C:
a) Detect the attenuation of the tightening torque decrement of fasteners (such as
bolts, nuts, etc.), that is, when the fasteners are re-tightened, the difference
between the torque at which the fasteners start to rotate and the tightening torque
before the test is the torque decrement;
b) Dismantle, inspect and analyze performance-related assembly parts according
to the control requirements of the engine manufacturer;
c) Take local clear photos of the surface of the main friction pairs, which includes
the journal, bearing, cylinder barrel (hole) (the reversal point of the upper and
lower dead points of a ring), piston (skirt), piston ring, cam, tappet, rocker arm,
valve, valve seat, etc.;
d) Take magnified photos of the overall appearance of the failed parts, the fracture
surface and the cracks;
e) Take photos of the upper and lower surfaces of the piston top, the spark plug
ceramic body and electrode, and the injector;
f) Take photos of the deposits, sludge and paint films on the oil pan, cover, cylinder
head upper surface, piston and cam surfaces;
g) Take photos of leaking sea...