ISO 15622:2010 pdf free download – Intelligent transport systems一Adaptive Cruise Control systems一Performance requirements and test procedures.
If the power demand of the driver is greater than that of the ACC system, automatic braking shall be disengaged with an immediate brake force release. A driver intervention on the accelerator pedal shall not lead to a significant delay of response to driver’s input.
6.3.1.5 Automatic brake activation (ACC type 2 only) shall not lead to locked wheels for periods longer than anti-lock devices (ABS) would allow. This need not require an ABS system.
6.3.1.6 Automatic power control by ACC shall not lead to excessive positive wheel slip for periods longer than traction control would allow. This need not require a traction control system.
6.3.1.7 ACC systems may automatically adjust the time gap without action by the driver in order to respond to the driving environment (e.g. poor weather). However, the adjusted time gap shall not be less than the minimum time gap selected by the driver.
6.3.1.8 If the system allows the driver to select a desired time gap, the selection method shall conform to either one of the following:
1) if the system retains the last selected time gap after it is switched to ACC OFF, as shown in Figure 2, the time gap shall be clearly presented to the driver at least upon system activation;
2) if the system does not retain the last selected time gap after it is switched to ACC OFF, as shown in Figure 2, the time gap shall be set to a predefined default value equal of 1,5 s or greater.
6.3.1.9 If there is a conventional cruise control function in addition to ACC there shall be no automatic switching between the ACC and conventional cruise control.
6.3.2 Display elements
A minimum feedback information for the driver contains activation state (whether the ACC system is active or not active) and the set speed. This can be done by a combined output, e.g. displaying of set speed information only when ACC is active.
If the ACC system is not available due to a failure, the driver shall be informed. If a symbol is used to notify the driver, a standard symbol shall be employed. See ISO 2575.
If the ACC system deactivates automatically, the driver shall be informed. If a symbol is used to notify the driver, a standard symbol shall be employed.
If the vehicle is equipped with both ACC and conventional cruise control systems, the driver should be made aware of which system is operating.
A “vehicle-detected” signal, with the meaning that the active ACC system is detecting a forward vehicle which is used for adaptation of the control, is recommended but not mandatory.
6.3.3 Symbols
If symbols are used to identify ACC function or malfunction, standardized symbols in accordance with ISO 2575 shall be used.
6.5 Activation of brake lights (ACC type 2 only)
If automatic service braking is applied, the brake light shall be illuminated. When the ACC system applies other deceleration devices the system may illuminate the brake lights. The brake lights shall be illuminated within 350 ms of the ACC system initiating the service brake. To prevent irritating brake light flickering, the brake light may remain on for a reasonable time after the ACC initiated braking has ended.
6.6 Failure reactions
Table 4 and Table 5 show the required reactions to failures depending on which subsystem fails. See Figure 6.
The failures described in Table 4 and Table 5 shall result in immediate notification to the driver (except in the case of a gearbox failure with type 2 systems). The notification shall remain active until the system is switched off.
The reactivation of the ACC system shall be prohibited until a successful self-test, initiated by either ignition off/on or ACC off/on, is accomplished.