Pneumatic suspension leveling system for vehicles
AssigneeDaimlerChrysler AG
InventorsEberhard Kutscher, Joachim Lang, Gerhard Lohrmann, Reiner Schneider, Udo Walter
Life of this patent
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Abstract
It is proposed that a pneumatic suspension leveling system for vehicles with a compressor which can be turned on and off by a control device in function of demand, which compressor only needs to operate intermittently, with predetermined on-time duration, during normal operation, be improved with respect to its functional capacity. This problem is solved in accordance with the invention in that the control device of the pneumatic suspension leveling system varies the on-time duration of the compressor in function of the heat transfer conditions which prevail between the compressor and the air enveloping the latter.
Claims6
In an improved vehicle pneumatic suspension leveling system having pneumatic suspension leveling elements assigned to vehicle wheels and axles, and having a compressor with a predetermined on-time duration and with sufficient capacity to be selectively operated intermittently during normal operation of the pneumatic suspension leveling system, and having an electronic control device for activating and deactivating the compressor, the improvement comprising:
- a sensor for producing an input signal to the electronic control unit responsive to changes in the rate of heat transfer from the compressor to the air about the compressor wherein an increase in the rate of heat transfer corresponds to an increased on-time duration (ED) of the compressor.
In an improved vehicle pneumatic suspension leveling system having pneumatic suspension leveling elements assigned to vehicle wheels and axles, and having a compressor with a predetermined on-time duration and with sufficient capacity to be selectively operated intermittently during normal operation of the pneumatic suspension leveling system, and having an electronic control device for activating and deactivating the compressor, the improvement comprising:
- a sensor for producing an input signal to the electronic control unit responsive to changes in air temperature and in vehicle speed so that a decrease in air temperature produces an increase in the compressor on-time (ED) and an increase in vehicle speed produces an increase in the compressor on-time (ED) wherein air temperature prevailing in the compressor environment is determined by sensing the temperature of air entering the inlet of the vehicle engine and wherein the rate of air flow about the compressor is determined by sensing the speed of the associated vehicle.
Dependencies are inferred from the claim text.