Combustion engine, diagnostic arrangement for a combustion engine and a method for setting a combustion engine

A diagnostic arrangement for a combustion engine having a fuel supply unit;

• an ignition unit;
• a controller configured to control the amount (x) of fuel supplied and the ignition time point;
• an adjustable throttle element configured to control the amount of combustion air supplied to the combustion engine;
• an adjustable idling stop configured for the throttle element;
• and, the controller having a closed-loop control unit which is configured to regulate the rotational speed (n) of the combustion engine to a set-point rotational speed (nsoll) while idling;
• the diagnostic arrangement comprising:
• a diagnostic unit;
• said closed-loop control unit being configured to be switchable into an off state during idling;
• and,
• said diagnostic unit including a device for switching off said closed-loop control unit.

A method for setting a combustion engine including a fuel supply unit;

• an ignition unit;
• a controller configured to control the amount (x) of fuel supplied and the ignition time point;
• an adjustable throttle element configured to control the amount of combustion air supplied to the combustion engine;
• an adjustable idling stop configured for the throttle element;
• and, the controller having a closed-loop control unit which is configured to regulate the rotational speed (n) of the combustion engine to a set-point rotational speed (nsoll) while idling;
• the method comprising the steps of:
• switching off the closed-loop control unit during idling of said combustion engine;
• changing the amount (x) of fuel supplied to said combustion engine;
• evaluating a rotational speed value;
• determining how the idling stop is to be adjusted to achieve a set-point rotational speed maximum (nsollmax) on the basis of the rotational speed value;
• and,
• again switching on the closed-loop control unit.