Method for the control and regulation of an internal combustion engine

摘要

Disclosed is a method for the control and regulation of an internal combustion engine (1), comprising an independent common rail system on the A-side and an independent common rail system on the B-side. During normal operation, the rail pressure (pCR(A), pCR(B)) is controlled in each common rail system via a low pressure-side suction throttle (4A, 4B) as the first pressure-adjusting element in a rail pressure control loop and, at the same time, the rail pressure (pCR(A), pCR(B)) is subjected to a rail pressure disturbance variable via a high pressure-side pressure control valve (11A, 11B) as a second pressure-adjusting element, by means of which a pressure control valve volume flow is redirected via the high pressure-side pressure control valve (11A, 11B) from the rail (6A, 6B) into a fuel tank (2). The method is characterized in that a first emergency operation is implemented for the common rail system in question when a defective rail pressure sensor (8A, 8B) and a non-defective pressure control valve (11A, 11B) have been detected in said common rail system, while a second emergency operation is implemented for the common rail system in question when a defective rail pressure sensor (8A, 8B) and simultaneously a defective pressure control valve (11A, 11B) have been detected in said common rail system, and wherein the normal operation is implemented for the other, non-defective common rail system.

主权项

1. A method for open-loop and closed-loop control of an internal combustion engine with an independent A-side common rail system and an independent B-side common rail system, the method comprising the steps of, in a normal operating mode, automatically controlling rail pressure in each common rail system by a suction throttle on a low-pressure side as a first pressure regulator in a closed-loop rail pressure control system; simultaneously acting on the rail pressure with a rail pressure disturbance variable by way of a pressure control valve on a high-pressure side as a second pressure regulator by a pressure control valve volume flow being redirected from the rail into a fuel tank by the pressure control valve on the high-pressure side; setting a first emergency operating mode for an affected of the common rail systems if a defective rail pressure sensor and a nondefective pressure control valve are detected in the affected common rail system; setting a second emergency operating mode for the affected common rail system if a defective rail pressure sensor and simultaneously a defective pressure control valve are detected in the affected common rail system; and wherein normal operating mode continues to be set for the other, nondefective of the common rail systems.