Patent ID: 6959591

Claim:
A test stand for cylinder head components of an internal combustion engine comprising at least one combustion or pressure chamber, said test stand comprising means for supplying a hydraulic fluid to the combustion or pressure chamber, and means for controlling the pressure of this fluid so as to simulate pressure cycles in the combustion or pressure chamber, wherein said means for controlling comprises: at least one source of high-pressure hydraulic fluid, the high-pressure being monitored at a constant level which is adjustable, at least one solenoid valve per combustion or pressure chamber, receiving hydraulic fluid from the high-pressure source, and driving means in order to automatically drive each solenoid valve as a function of the pressure in the combustion or pressure chamber and predetermined pressure-time curve, so that each solenoid valve feeds the combustion or pressure chamber with hydraulic fluid the pressure of which is controlled at any time by the solenoid valve and simulates predetermined pressure cycles as a function of time, wherein said test stand comprises: a hydraulic block in which channels are made, forming at least part of the means for supplying hydraulic fluid from the source of high-pressure hydraulic fluid to the solenoid valve and means for returning the hydraulic fluid from the solenoid valve to the hydraulic source which are continuously available, and means for creating a first calibrated leak in the hydraulic block for each combustion or pressure chamber, between the corresponding solenoid valve and the circuit for returning hydraulic fluid, said leak being designed to limit the flow of fluid in the return circuit when the corresponding chamber is not connected to the source of high pressure and to allow a quick reaction of the solenoid valve to make it able to regulate the pressure around the predetermined pressure-time curve.