GB/T 26776-2011Road vehicles -- Alarm systems for commercial vehicles of maximum authorized total mass greater than 3.5 t (English PDF)

5.10.1 corresponds to ISO 7637-2;

-- changed ISO 7637-2 to GB/T 21437.2 that is identically adopted in China;

-- deleted the relevant content used as reference in ISO 512 as well as relevant

contents in ISO 15763:2002 because ISO 512 has been abolished;

-- deleted ISO 1176 and ISO 3833, because these two standards have been

transformed and the content is well known to the industry, it is unnecessary to cite

them again;

-- to be consistent with GB/T 3730.1, commercial vehicles (including passenger cars,

semi-trailer tractors and trucks) are used in the standard name and scope, and the

word "buses" is deleted;

-- the definition of key is not easy to understand, the definition of scanner is

inaccurate, and it is not necessary to define these two words, so delete them;

-- the subclauses 5.11 and 5.14 in ISO 15763:2002 are both tests for sound warning

devices. This standard incorporates the sound level test of the original text 5.14

into 5.11, which is easier to understand and operate;

-- IEC 60529 is changed to ISO 20653, the protection standard specially used for

Road vehicles - Alarm systems for commercial vehicles of

maximum authorized total mass greater than 3.5t

3.8 warning device

a system component that alerts on alarm condition

3.9 panic warning device

a system component that enables the warning device to immediately enter the alarm

condition regardless of whether the VAS is set or unset

3.10 status display

a system component that shows VAS status

3.11 immobilizer

a system component that prevents the use of the vehicle's own engine

3.12 perimeter protection

system functions designed to detect and warn of improper opening of doors, trunk lids,

hoods, panic exits, cab tilt, and trailer decoupling or power loss

3.13 volumetric protection

system functions designed to detect intrusions into the cab/passenger compartment and

actions inside

4.1 System description

The VAS shall include one or more detectors/sensors, a control unit with means for

setting/unsetting and triggering the alarm, power supply and alarm means.

The VAS shall include at least one audible warning device. It can also include light

alarm or wireless warning device (wireless warning device shall comply with relevant

regulations on the use and management of wireless equipment), or a combination of the

above-mentioned alarms. It may also include light indicators that provide VAS status

or status change information, immobilizer, and other equipment that meets the

requirements of this Standard. Figure 1 is a schematic diagram of the required (solid

lines) or recommended (dotted lines) components of the system and their connections.

g) The power is off.

All VAS components shall be compatible with each other and shall not affect the

performance of the vehicle when the alarm is removed. Regardless of setting or

unsetting the alarm, the status of the VAS cannot be changed at will. Do not operate or

stop working under the influence of any other warning device. When a power outage

occurs, the VAS must not change its status after power is restored. The failure of any

sound and light warning device shall not affect the normal operation of the rest of the

VAS. VAS components are designed, manufactured and installed to minimize the

possibility of false alarms. All VASs shall prevent unauthorized users from easily and

quickly entering or compromising the system.

4.2.2 Detection

VAS shall provide perimeter protection. Additional sensors can be installed to detect

interference or intrusion into the vehicle. Additional sensors can be unset by the user,

but only valid for one activation cycle of the VAS.

VAS can provide panic warning devices set from inside the vehicle. The driver can at

least set the audible warning device regardless of whether the VAS is in the setting or

unsetting status. The driver is at least able to set the audible warning device. It is also

possible to set a light or wireless alarm or a combination of warning devices. The driver

shall be able to unset the panic alarm. The operation of the panic alarm system shall not

affect the starting or running of the vehicle engine. The duration of each active alarm

must not be limited.

4.2.3 Control

The control unit shall provide an interface for receiving detector/sensor signals. When

the VAS is in the alarm setting status, the control unit shall monitor the detectors/sensors.

Output an alarm signal to the warning device within 1s of the alarm status appearing.

When the alarm is unset, the VAS shall cancel the alarm status and alarm signal within

1s.

4.2.4 Alarm setting/unsetting

4.2.4.1 Overview

VAS can display VAS setting/unsetting alarm status information and setting/unsetting

alarm status change information with light indicator signals. Light indication signals

may also be generated by turn signals, interior lights or vehicle position lights

(including all lamps connected to the circuit) or a combination thereof. The signal

duration does not exceed 3s.

4.2.4.2 Setting

The VAS can set an alarm by an appropriate method. After the VAS start-up procedure

is completed, the perimeter protection shall enter the alarm setting status within 10s.

The optional sensor shall enter the alarm setting status within 60s after the start-up

procedure is completed.

4.2.4.3 Unsetting

No VAS component shall be marked with a VAS unsetting code or warning. The alarm

shall be unset by one or more of the following methods:

a) Any type of mechanical key switch:

1) Integral key device or switch or both;

2) A door locking mechanism used in conjunction with a separate switch but

cannot be unset by using the interior door locking mechanism.

The key switch protrusion shall not exceed 1mm of the housing. The protrusions

shall be conical or convex. The connection between the protrusion and the shell

shall be able to withstand at least 600N tensile force. Both shall be able to bear

the moment of 25N·m alone. The key switch shall have a cylindrical bayonet.

Key profile shall have at least 1000 valid combinations. The key switch cannot

be opened even if only one tooth profile is different from the original key. The

key socket of the external key switch shall be covered or waterproof and dustproof

in other ways.

b) Code key switch: Shall be installed inside the vehicle with a limited opening time.

The time to unset the alarm is not less than 5s, not more than 15s. It shall meet

the requirements of a), otherwise the code switch shall have no less than 10,000

combinations.

c) Electrical or electronic devices [except for switches specified in b)]: For example,

the remote-control switches, shall use at least 50000 valid combinations of codes

to transmit signals. The minimum scan time for every 5000 variables is 24h,

otherwise there shall be a rolling code. The probability of obtaining the correct

code within 24 hours is no more than 4%.

d) If the mechanical key switch or electrical/electronic device is installed in the

cab/passenger compartment with time limit control, the alarm shall be unset

within 5s~15s after the door is opened.

4.2.5 Alarm signal

4.2.5.1 Overview

Alarm status shall be alerted by audible warning device. It can also be alerted by light

alarm signal, wireless signal or a combination of both. Audible warning signals must

not cause confusion about the cause of the alarm and must not sound the same as other

road traffic signals (for example, panic service vehicles).

4.2.7 Power supply

4.2.7.1 Main power

The main power source of the VAS is the vehicle battery. The supply voltage within the

ambient temperature range of 4.2.8 shall meet the following requirements:

-- For 12V system, it is 9V~15V;

-- For 24V system, it is 18V~32V.

The VAS (including all its sensors) must not consume more than 10mA (average) of

current in the alarm setting status at nominal voltage.

4.2.7.2 VAS backup power supply (optional)

If the VAS has a backup power source, it can include rechargeable batteries and chargers

or high-performance chemical batteries. The capacity of the VAS backup power supply

shall ensure that the VAS can work for at least 120h in a static status. Work at least 300s

in alarm status.

4.2.7.3 Self-powered sound device (optional)

If equipped with a self-powered sounder, it shall operate from a rechargeable battery

and charger or high-performance chemical battery. The battery capacity shall be

sufficient to operate the speaker for at least 300s. If the main power supply is cut off or

used up or the sounder connection is cut off, the sounder shall be able to work

automatically.

4.2.8 Installation environment

The VAS and its components are designed, manufactured and installed to withstand the

in-vehicle environment. There are two specified ranges for ambient temperature:

a) The temperature range for components installed in the passenger compartment or

trunk is (-40±2)°C~(+85±2)°C;

b) Unless otherwise specified, the temperature range of components installed in the

engine compartment is (-40±2)°C ~ (+125±2)°C.

According to ISO 20653, the following protection levels shall be achieved:

-- For components installed in the passenger compartment or trunk, it shall reach

IP40;

-- For components installed in a fully covered environment, it shall reach IP5K4;

-- For components installed in an uncovered environment, in shall reach IP6K7.

working.

5.3 Basic test

The basic test shall be carried out after the completion of each test procedure. It is

carried out according to the following steps:

a) Check whether the VAS is in the alarm unsetting status;

b) Put the VAS in the alarm setting status;

c) If an immobilizer is installed, output a signal to the immobilizer circuit to check

whether it starts within 1s;

d) Manipulate sensors/detectors to generate alarm status;

e) Output signal to the warning device circuit to check whether the start-up alarm

condition is consistent with 4.2.3;

f) Put the VAS in the alarm unsetting status;

g) If an immobilizer is installed, check that the output to the immobilizer circuit is

cut off;

h) Check that the output to the warning device has been cut off.

During the test, no status change shall occur regardless of whether the VAS is in the set

or unset status. Nor shall it cause any warning device to work or stop working.

5.4 Electrical test

5.4.1 Lamps

The following tests are not required when the vehicle light signal is used as a light

warning device.

5.4.2 Overvoltage

5.4.2.1 Make VAS subjected to the following overvoltage tests with the alarm set and

unset:

a) For 12V system, it is (18±0.2)V for 1h;

b) For 24V system, it is (36±0.5)V for 1h.

After the test, the VAS shall meet the requirements of the basic test (see 5.3).

5.4.2.2 For 12V system only, the VAS can withstand overvoltage of 24V±0.2V for 1min

in two status of setting alarm and unsetting. After the test, the VAS shall perform the

5.5 Temperature/humidity accelerated aging test

5.5.1 The VAS shall perform basic test and meet its requirements under the following

test conditions (see 5.3).

5.5.2 Except for batteries, components whose design ambient temperature is between -

40°C~85°C shall be tested at +85°C. Components whose design ambient temperature

is between -40°C~+125°C shall be performed at +125°C.

5.5.3 For components tested at +125°C, the test shall be carried out according to e)~h)

of 5.5.5 using the test temperature level of +125°C. Then load it into the VAS system.

Use the test temperature of +85°C to carry out the procedure in 5.5.5.

5.5.4 The test consists of 10 cycles. Each cycle is 24h. Carry out according to the

following test sequence (as shown in Figure 2).

5.5.5 The test cycle is as follows:

a) The temperature of the test room is kept at tc=23°C±5°C. The relative humidity

(RH) is between 45%~75%. Keep 4h.

b) Raise the temperature tc to 55°C±2°C within 0.5h. The relative humidity (RH) is

95%~99%.

c) Keep tc at 55°C±2°C. The relative humidity (RH) is 95%~99%. Keep 10h.

d) Reduce the temperature tc to -40°C±2°C within 2.5h.

e) Keep at -40°C±2°C for 2h.

f) Within 1.5h, according to the conditions of 4.2.8 and Table 2, increase tc to the test

temperature used.

g) According to the conditions of 4.2.8 and Table 2, keep tc at the adopted test

temperature for 2h.

h) Recover tc to 23°C±5°C within 1.5h.

5.5.6 The last cycle shall stop when the dew point is reached. After the test, the VAS

shall meet the requirements of the basic test (see 5.3).

NOTE: In the d), e), f), g), h) stages of 5.5.5, the relative humidity is not controlled.

5.5.7 If it takes more than 1.5h for the laboratory to reach the specified test temperature

level, the time in 5.5.5f) can be extended accordingly, and the time in a) can be

shortened.

5.5.8 The test can be interrupted at the end of a cycle. During the test interruption, the

test sample shall be kept at 23°C±5°C and 45%~75% relative humidity. Note the

interruption time in the test report.

5.5.9 The test temperatures provided above may not be the maximum temperatures that

components will experience when installed in an engine compartment. When parts are

intended to be installed under the hood close to the engine, the test temperature shall be

140°C.

5.6 Salt spray corrosion test

The components installed outside the passenger compartment shall be subjected to a

corrosion test for 144 hours in accordance with the provisions of GB 2423.17. The test

shall be carried out under power-off conditions. After the test, it shall perform the basic

test for the VAS and meet its requirements (see 5.3).

5.7 Vibration test

Conduct a sinusoidal vibration test on the component/VAS under the following

conditions. After the test, it shall perform the basic test for the VAS and meet its

requirements (see 5.3).

a) For Category 1 components [components installed in the interior of the vehicle

(cab)]

The maximum amplitude of the 10Hz~50Hz sweep frequency range is 0.5mm.

The maximum acceleration of 50Hz~500Hz is 50m/s2;

b) For Category 2 components (components mounted on the engine)

The maximum amplitude of 20Hz~62Hz sweep frequency range is 2mm. The

maximum acceleration of 62Hz~300Hz is 300m/s2;

c) For Category 3 components (components mounted on the chassis)

The maximum amplitude of the 5Hz~16Hz sweep frequency range is 10mm. The

maximum acceleration of 16Hz~500Hz is 100m/s2.

In each case, the frequency change rate is 1 octave/min, and the number of cycles is 10

(tests are performed along the three vertical axes). Vibration shall be carried out at low

and high frequencies at the maximum stable vibration amplitude.

NOTE: According to the negotiation between the supplier and the buyer, the parameters of GB/T

28046.3 can be used for testing.

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