akkamaan
Agricultural
- Jun 20, 2010
- 110
I get a lot of questions about proportional hydraulic pilot control in mobile applications in Swedish forums.
I have started to dig into the 4-way X/Y controls and the history behind the proportional hydraulic pilot motion control. Since we started to have fully hydraulic excavators 60+ years ago manufacturers have worked on how to make machine control easier and more efficient.
I have tracked mechanical combination (X/Y) levers back to the early 1960s, and the earliest sign of 4-way X/Y joystick pilot control I have tracked back to 1965/1966 when Swedish Åkerman H11 fully hydraulic excavator (today Volvo CE) was marketed with hydraulic pilot control. After having contact with a retired Åkerman electronic head engineer from 1973 and forward in time, he believed that Åkerman had copied some other hydraulic manufacturers valve design and then simply manufactured their own valve system.
Swedish Monsun-Tison, later on, VOAC (VOlvoAtlasCopco), and today Parker-Hannifin started to market their own hydraulic pilot control valves around 1972-73, at least that was the time the three biggest logging equipment manufacturers in Sweden, Kockums, ÖSA, and Volvo BM, started to use them.
But it is about 7 years between 1965 and 1972 so there must have been other hydraulic valve manufacturers that have had these hydraulic pilot control valves on the market before 1965.
So my question is if someone can help me with the history of these pilot control valves before 1965. I know the aviation-, the marine-, and of course, the military-industry have been pioneers in many of these pilot control systems. When it comes to aviation, for example, remote control of rudders on big aircraft is not about motion control, it is rather position control which require some kind of "closed-loop" for feedback of position. A motion control lever usually includes a "dead man's grip" which means that the control lever returns to neutral and stop the motion if the operator "dies" or take his hand off the lever. If an aircraft pilot falls asleep during the flight the control lever cant go back to neutral, the lever has to stay in the assigned position. Just now I am only interested in hydraulic pilot motion control valve history.
Thanks for reading this
Cheers
//Per A
I have started to dig into the 4-way X/Y controls and the history behind the proportional hydraulic pilot motion control. Since we started to have fully hydraulic excavators 60+ years ago manufacturers have worked on how to make machine control easier and more efficient.
I have tracked mechanical combination (X/Y) levers back to the early 1960s, and the earliest sign of 4-way X/Y joystick pilot control I have tracked back to 1965/1966 when Swedish Åkerman H11 fully hydraulic excavator (today Volvo CE) was marketed with hydraulic pilot control. After having contact with a retired Åkerman electronic head engineer from 1973 and forward in time, he believed that Åkerman had copied some other hydraulic manufacturers valve design and then simply manufactured their own valve system.
Swedish Monsun-Tison, later on, VOAC (VOlvoAtlasCopco), and today Parker-Hannifin started to market their own hydraulic pilot control valves around 1972-73, at least that was the time the three biggest logging equipment manufacturers in Sweden, Kockums, ÖSA, and Volvo BM, started to use them.
But it is about 7 years between 1965 and 1972 so there must have been other hydraulic valve manufacturers that have had these hydraulic pilot control valves on the market before 1965.
So my question is if someone can help me with the history of these pilot control valves before 1965. I know the aviation-, the marine-, and of course, the military-industry have been pioneers in many of these pilot control systems. When it comes to aviation, for example, remote control of rudders on big aircraft is not about motion control, it is rather position control which require some kind of "closed-loop" for feedback of position. A motion control lever usually includes a "dead man's grip" which means that the control lever returns to neutral and stop the motion if the operator "dies" or take his hand off the lever. If an aircraft pilot falls asleep during the flight the control lever cant go back to neutral, the lever has to stay in the assigned position. Just now I am only interested in hydraulic pilot motion control valve history.
Thanks for reading this
Cheers
//Per A
