This standard specifies the performance requirements and test methods for automobile anti-theft devices. This standard applies to M1 vehicles. GB 15740-1995 Performance requirements for automobile anti-theft devices GB15740-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Performance requirements for anti-theft devices for automobiles
Motor vehicle-Protective devices against unauthorized use-Performance reguirments1 Subject content and scope of application
This standard specifies the performance requirements and test methods for anti-theft devices for automobiles. This standard applies to M-category automobiles.
2 Terminology
2.1 Anti-theft device
refers to a system used to prevent the vehicle from being illegally used. 2.2 Steering mechanism
GB 15740--1995
refers to the steering control system, the steering column and its casing, the steering shaft, the steering gear and all parts that directly affect the effectiveness of the anti-theft device. 2.3 Combination
refers to a specially designed and manufactured combination of locking systems. 2.4 Key
is a device that enables the locking system to operate, and the locking system can only be operated with it. 3 General requirements
3.1 Each M-class vehicle must be equipped with an anti-theft device. 3.2 The anti-theft device should consist of a system that can prevent the illegal normal start of the engine or other main power source of the vehicle and one of the following systems:
steering mechanism locking system;
transmission system locking system;
shift mechanism locking system.
3.3 The anti-theft device should be designed to ensure that only when it does not work can the following processes be completed: start the engine with normal operation;
h turn the vehicle, drive it with its own power or move it forward. 3.4 The use of a key should be able to meet the requirements of 3.3. 3.5 For systems that rely on the capture of a key in the lock to operate, the key cannot be removed from the lock when the anti-theft device described in Article 3.3 has been activated or is in an activated position, except as described in Article 4.1.5. 3.6 The anti-theft device and the parts of the vehicle related to its operation should be designed to ensure that the device cannot be quickly and accidentally activated, or damaged by cheap, easily concealed tools that are easy for the general public to carry and make. 3.7 The anti-theft device should be installed in the vehicle as an original part (that is, the device is installed on the vehicle by the manufacturer before the vehicle is sold for the first time). Its installation method should ensure that when it is in the locked state, it cannot be disassembled without the use of special tools, even if its housing is removed. If the removal of the screw can render the anti-theft device ineffective, the screw should be covered by a fixing on the anti-theft device, or an anti-disassembly screw should be used.
GB 15740--1995
3.8 The keys used in the locking system shall include no less than 1000 different combinations. If the number of vehicles manufactured in a year is less than 1000, the number of combinations shall be equal to the number of vehicles. The occurrence rate of the same combination in a car model shall not exceed 1/1000.3.9 No visible code is allowed on the lock and key.3.10 The design, manufacture and installation of the lock shall ensure that when it is in the locked position, the lock cylinder cannot be rotated by anything except the key with a torque of less than 2.45N·m.3.10.1 For lock cylinders with pin-type tumblers, there shall be no more than two identical tumblers arranged in adjacent positions working in the same direction. The number of identical tumblers on the same lock shall not exceed 60% of the total.3.10.2 For lock cylinders with disc-type tumblers, there shall be no more than two identical tumblers arranged in adjacent positions working in the alternate direction. The number of identical tumblers on the same lock shall not exceed 50% of the total number. 3.11 When the vehicle is in motion, the anti-theft device shall not be locked accidentally in any way that may endanger safety. 3.11.1 The anti-theft device shall be locked only after the engine control device is first placed in the parking position and then an action is performed, and the action is not allowed to be a continuation of the engine parking state. 3.11.2 For anti-theft devices acting on the steering gear, transmission system or gearshift control, if the key is pulled out to achieve locking, before locking the anti-theft device, the key must have a movement of at least 2 mm or an additional manual function to prevent accidental movement or partial removal of the key.
3.12 The anti-theft device shall be able to be maintained in the working position by mechanical means only, and auxiliary power can only be used to lock and unlock the anti-theft device. 3.13 Before the anti-theft device is opened, the vehicle's driving power system cannot be started by normal means. 3.14 Devices that only prevent the vehicle's brakes from releasing do not belong to anti-theft devices. 3.15 For an anti-theft device equipped with a driver alarm system, when the driver's side door is opened, if the anti-theft device is not started or any key is not removed, the alarm system shall be triggered immediately. 4 Special requirements
In addition to the general requirements described in Chapter 3, the anti-theft device shall also meet the following special requirements. 4.1 Anti-theft device acting on the steering mechanism 4.1.1 The anti-theft device acting on the steering mechanism shall be able to lock the steering mechanism. 4.1.2 When the anti-theft device is in effect, it shall not fail. 4.1.3 After the anti-theft device has completed 2500 cycles of wear test according to the test method specified in Appendix A (Supplement), it shall still meet the requirements of 3.11, 4.1.1, 4.1.2, and 4.1.4. 41.4 The anti-theft device shall have sufficient strength to withstand a torque of 200 N·m applied in both directions around the steering axis when it is in working condition, and the steering mechanism shall not suffer damage that endangers safety. 4.1.5 If the key of the anti-theft device can be withdrawn from a position other than the position that locks the steering mechanism, it should be designed so that the action of reaching this position and removing the key cannot be achieved unintentionally. 4.2 Anti-theft device acting on the powertrain 4.2.1 Anti-theft device acting on the powertrain should be able to prevent the rotation of the vehicle's drive wheels. 4.2.2 When the anti-theft device is in effect, it should not fail. 4.2.3 When the key is placed in the lock of the device, the powertrain cannot be locked unintentionally, even if the mechanism preventing the engine from starting is in operation or in the working position. bzxz.net
4.2.4 The anti-theft device should be designed and manufactured so that it remains fully effective after withstanding the wear caused by 2500 locking cycles in each direction.
4.2.5 If the key of the anti-theft device can be withdrawn from a position other than the position that locks the powertrain, it should be designed so that the action of reaching this position and removing the key cannot be achieved unintentionally. 4.2.6 The anti-theft device shall be strong enough to withstand a static torque applied in two directions which is greater than 50% of the torque normally applied to the transmission system without causing damage that endangers safety. The test torque is not determined based on the maximum torque of the engine, but on the maximum torque that can be transmitted by the clutch or hydraulic transmission. 4.3 Anti-theft device acting on the gearshift mechanism 4.3.1 The anti-theft device acting on the gearshift mechanism shall be able to prevent any gear change. 4.3.2 For manual transmissions, it must be possible to lock the gear lever in the reverse position, and it is also allowed to have the function of locking the gear lever in the shift position. 4.3.3 For automatic transmissions with a "park" position, it must be possible to lock in the "park" position, and it is also allowed to lock in the neutral and/or reverse positions.
4.3.4 For automatic transmissions without a "park" position, it must be possible to lock in the neutral and/or reverse positions. 4.3.5 The design and manufacture of the anti-theft device shall ensure that it remains fully effective after being subjected to the damage caused by 2500 locking cycles.
5 Additional equipment
5.1 This standard allows the anti-theft device to be equipped with an audible or visual alarm device, and also allows the optional installation of an additional device to prevent the vehicle from being stolen, but the additional device needs to be activated by an independent method. 5.2 If the anti-theft device is additionally equipped with an external audible and/or visual alarm device, the signal emitted by the alarm device shall be a short signal that automatically stops within a time not exceeding 30 seconds. The signal can only be restarted when the device is activated again. 5.2.1 If an audible signal is used, the signal can be emitted by the audible alarm device normally installed on the vehicle. 5.2.2 If a visual signal is used, the signal can only be emitted by the flashing of the vehicle warning lights. 3
Test equipment
The test equipment should include:
GB 15740—1995
Appendix A
Destruction test of anti-theft device acting on steering mechanism (supplement)
Bracket for mounting the steering mechanism sample equipped with anti-theft device specified in this standard. Mechanism for opening and locking the anti-theft device with a key. b.
Mechanism for rotating the steering shaft relative to the anti-theft device. A2 Test method
42.1 Mount the steering gear sample with anti-theft device on the bracket described in A1.1. A2.2 One cycle of the test procedure shall include the following steps: a.
Starting position: Unlock the anti-theft device and turn the steering shaft to a position where the anti-theft device cannot engage, except for the type that can lock the steering mechanism in any position.
Turn the anti-theft device from the unlocked position to the locked position with the key in the working state. Start turning the steering shaft to ensure that the torque acting on it is 5.8±0.25N·m at the moment when the anti-theft device engages. Unlock the anti-theft device in the normal way. To facilitate opening, reduce the torque to zero. Unlock
Return the steering shaft to a position where the anti-theft device cannot engage. Repeat steps b, c, d, and e in the opposite direction, but the steering shaft is turned in the opposite direction. The time interval between two adjacent engagements shall be at least 10s. A2.3 Repeat the wear cycle as many times as required by 4.1.3 of this standard. 2.tkg
Weight 2.0kg
Tiss 0.8m
Swing angle 23
Schematic diagram of wear test device
Additional remarks:
This standard is proposed by China National Automotive Industry Corporation. GB15740—1995
This standard is issued by the National Technical Committee for Automotive Standardization. This standard is drafted by China Automotive Technology Research Center. The main drafter of this standard is Zhong Sizhao.
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