초록 ▼

A hydraulically operated industrial machine has hydraulic work components such as a boom, bucket or the like, and also uses hydraulic motors for propelling the machine. The motors and cylinders are controlled by pilot pressure valves to provide pressure to pilot operated valves. A pressure reducing

A hydraulically operated industrial machine has hydraulic work components such as a boom, bucket or the like, and also uses hydraulic motors for propelling the machine. The motors and cylinders are controlled by pilot pressure valves to provide pressure to pilot operated valves. A pressure reducing valve is utilized for providing hydraulic fluid at a pilot pressure to the pilot valves. The reducing valve regulates the pilot pressure as a function of one or more parameters indicating the consumption of hydraulic power in the system, such as drive engine speed, or other signals including oil temperature, throttle position, and, if desired, feedback signals from the system.

대표청구항 ▼

[ What is claimed is:] [1.]1. A pilot pressure controller connected in a hydraulic circuit of an industrial machine having a pump driven by a power source, a proportional output valve for controlling pressure from said pump to a pilot valve, said proportional output valve providing pressure to the p

[ What is claimed is:] [1.]1. A pilot pressure controller connected in a hydraulic circuit of an industrial machine having a pump driven by a power source, a proportional output valve for controlling pressure from said pump to a pilot valve, said proportional output valve providing pressure to the pilot valve as a function of an electric signal, and an electronic controller having an input connected to receive a signal which is a function of the horsepower demand on the power source and providing the electric signal to the proportional valve as a function of the signal received at the electronic controller input.