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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard is under the jurisdiction of National Technical Committee of Auto Standardization (SAC/TC 114).
Performance requirements and testing methods for electronic stability control system (ESC) for commercial vehicles
1 Scope
This standard specifies the terms and definitions, general requirements, performance requirements, test conditions and test methods of electronic stability control system (ESC) for commercial vehicles.
This standard is applicable to M2 vehicles with the maximum design total mass greater than 3,500 kg and M3, N2, N3 vehicles, all of which are equipped with ESC.
Note: ESC as the abbreviation of electronic stability control system is used below.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 12428 Laden mass calculating method for buses
GB/T 12549 Terms and definitions for vehicle controllability and stability
GB 12676-2014 Technical requirements and testing methods for commercial vehicle and trailer braking systems
GB/T 13594-2003 Antilock braking performance and test procedure for motor vehicles and their trailers
GB/T 26987-2011 Road vehicles - Measurement of road surface friction
GB/T 30677 Performance requirements and testing methods for electronic stability control system (ESC) for light vehicles
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 12549 and GB/T 30677 and the following apply.
3.1
ESC braking
situation that ESC issues an instruction to apply a brake to any wheel for a period of at least 0.5s and a pressure of at least 34 kPa (pneumatic braking system) or 172 kPa (hydraulic braking system)
4 General requirements
The ESC shall have the following functions:
a) Apply braking torque separately to all wheels according to certain control logic 1);
b) Operate normally in all stages of driving, such as acceleration, coasting and deceleration (including braking), except in the following cases:
1) The driver turns off the ESC;
2) The speed is lower than 20 km/h;
3) The system self-test has been completed and the vehicle is in the driving state specified in 7.8.2 for not more than 2 min;
4) The vehicle is in a back state;
c) The normal operation of the ESC shall not be affected even during the action of the anti-lock braking system (ABS) or the drive anti-skid system (ASR).
5 Performance requirements
5.1 Test of J steering
5.1.1 Test is carried out according to 7.7.2, and the following requirements shall be met at least 2 times in 4 consecutive tests in each series:
a) ESC shall reduce the engine/drive motor output torque by 10% or more than the driver's request torque for at least 0.5s after the vehicle under test enters the test starting point for 1.5s and passes the test ending point;
b) The wheels of the vehicle under test shall remain in the test lane at all times from the beginning of the test to the end of the test.
5.1.2 Test is carried out according to 7.7.3, and the following requirements shall be met at least 6 times in 8 consecutive tests in each series:
a) The speed of the vehicle under test shall not exceed 47 km/h after passing the test starting point for 3s;
b) The speed of the vehicle under test shall not exceed 45 km/h after passing the test starting point for 4s;
c) The wheels of the vehicle under test shall remain in the test lane at all times from the beginning of the test to the end of the test;
d) The ESC braking shall be activated.
5.2 ESC fault monitoring
5.2.1 The vehicle shall be equipped with an ESC signal device and alarm the driver in case of any fault of the system affecting the generation or transmission of ESC control and response signals.
5.2.2 The ESC fault signal device shall meet the following requirements:
a) It shall be at a position in front of the driver, and easy for him or her to inspect the state of the signal device at the driving position;
b) The vehicle during driving shall be in an upright state, and its orientation is shown in Figure 1;
c) It shall be indicated by one of the symbol for "ESC fault signal" or the word "ESC" as shown in Figure 1;
d) It shall be yellow or amber;
e) The signal device shall be bright and eye-catching after being lit so that the driver can clearly observe whether driving in the daytime or at night after adapting to the environmental road lighting conditions;
Figure 1 Symbols of "ESC fault signal"
f) In addition to the requirements of g) below, if any fault occurs, the ESC fault signal device shall be lit; moreover, as long as the ignition system switch is in the "ON" ("RUN") position, the ESC fault signal device shall be kept ON until the fault is eliminated;
g) Except as specified in 5.2.3, the ESC fault signal device shall be lit for functional inspection when the ignition locking system is in the "ON" ("RUN") position but the engine/drive motor is not running or when the ignition locking system is in the manufacturer's specified inspection position between "ON" ("RUN") and "Start";
h) The ESC signal shall be turned off when the vehicle ignition system is activated again after the fault has been eliminated in accordance with 7.8.4;
i) It can also be used to indicate faults of ESC-related systems/functions, including traction control systems, trailer stability assistance systems, curve brake control systems, and other similar functions that utilize throttle valves and/or independently control each wheel torque and share components with ESC.
5.2.3 When the startup system is in an interlocked state, the ESC fault signal device shall not be started.
5.2.4 The requirement of 5.2.2 g) is not applicable to signal devices displayed in common areas.
5.2.5 The manufacturer may also use the flashing mode of the fault signal device to indicate that the ESC is in operating state.
5.3 ESC OFF control device and other system controls
5.3.1 Manufacturer can set ESC OFF control device. The device shall be illuminated when the vehicle headlights are activated, and can adjust the operating mode of ESC so that it no longer meets the performance requirements of 5.1.1 and 5.1.2. The manufacturers can also assist in controlling the operating mode of ESC through other systems. As long as the system meets the requirements of 5.3.2 to 5.3.4, it is allowed to install any control device that prevents the ESC from meeting the requirements of 5.1.1 and 5.1.2.
5.3.2 Whichever mode the driver has previously selected, the vehicle ESC shall revert to the manufacturer's initial default mode that meets the requirements of Clauses 4 and 5 when the vehicle ignition system is restarted. However, the vehicle ESC does not need to return to the mode that meets the requirements of 5.1.1 and 5.1.2 each time the ignition system is restarted under the following conditions:
a) For all-wheel drive vehicles, the driver chooses low speed and off-road driving mode. This driving mode can lock the driving mechanisms of the front axle and the rear axle at the same time, so that the reduction ratio between the engine/drive motor speed and the wheel speed can be increased by at least 1.6.
b) For all-wheel drive vehicles, the driver chooses the mode of driving at a higher speed on the road where snow, sand or dust accumulate. This mode is capable of locking both the front and rear axle drive mechanisms and satisfies the stability requirements specified in 5.1.1 and 5.1.2 under the test conditions specified in Clause 6. However, if the ESC has more than one control mode that meets the requirements of 5.1.1 and 5.1.2 in the driving mode selected by the driver during previous driving, the ESC shall return to the initial default mode set by the manufacturer for this driving mode after the ignition system is restarted.
5.3.3 If the function of the ESC control device is only to set the ESC to a control mode that no longer meets the requirements of 5.1.1 and 5.1.2, it shall be indicated by the symbol shown in Figure 2 or the words "ESC OFF".
Figure 2 Symbols of the ESC OFF control device
5.3.4 If the ESC control device can set the ESC to a different control mode, and at least one of the modes no longer meets the performance requirements of 5.1.1 and 5.1.2, it shall be indicated by the symbol shown in Figure 2 and marked with the word "OFF" near the control mode. For vehicles in ESC control mode controlled by a multifunction control device, when the control device is in this mode, the controls shall be clearly displayed in this mode through the driver information display system with the symbol specified in 5.3.3 or the words "ESC OFF".
5.3.5 If the control devices of other systems can also place the ESC in a mode that no longer meets the performance requirements of 5.1.1 and 5.1.2, it is not necessary to indicate it in the way of 5.3.3.
5.4 ESC OFF signal device
5.4.1 If the manufacturer installs a control device in accordance with 5.3 to shut down or degrade the performance of the ESC, the signaling requirements of 5.4.2 to 5.4.5 shall be met to alert the driver when the ESC function is in a degraded state. This requirement is not applicable to the driver-selected mode described in 5.3.2 b).
5.4.2 If the vehicle manufacturer has set a control mode that causes the ESC to fail to meet the requirements of 5.1.1 and 5.1.2, an alarm device shall be provided to indicate when the ESC is in the control mode.
5.4.3 The signal device shall meet the following requirements:
a) It shall be at a position in front of the driver, and easy for him or her to inspect the state of the signal device at the driving position;
b) The vehicle during driving shall be in an upright state, and its orientation is shown in Figure 2;
c) It shall be indicated by using the ESC OFF symbol specified in 5.3.3 or the words "ESC OFF"; it can also be indicated by marking "OFF" on or near the control device and illuminated fault signal device specified in 5.3.3 or 5.3.5;
d) It shall be yellow or amber;
e) The signal device shall be bright and eye-catching after being lit so that the driver can clearly observe whether driving in the daytime or at night after adapting to the environmental road lighting conditions;
f) As long as the ESC is in a mode that fails to meet the requirements of 5.1.1 and 5.1.2, the signal device shall remain on;
g) Except as specified in 5.4.4 and 5.4.6, the ESC Off signal device shall be lit for functional inspection when the ignition locking system is in the "ON" ("RUN") position but the engine/drive motor is not running or when the ignition locking system is in the manufacturer's specified inspection position between "ON" ("RUN") and "Start";
h) When the ESC returns to the manufacturer's initial default mode, the signal device shall be off.
5.4.4 The ESC OFF signal does not need to be activated when the startup system is in an interlocked state.
5.4.5 The requirement of 5.4.3 g) is not applicable to signal devices displayed in common areas.
5.4.6 The manufacturer can also indicate other functional states except the manufacturer's initial default mode by "ESC OFF" alarm; although in this state, the requirements of 5.1.1 and 5.1.2 can still be met.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Performance requirements
6 Test conditions
7 Test methods
Annex A (Informative) Additional tests
