Auto Throttle

[audsp98]

Does Mahindra offer an auto throttle feature on their HST transmissions?

 

[dickfoster]

What's an auto throttle? If you mean cruse control then the answer is yes.

 

[audsp98]

The feature on the throttle that when you press the pedal the engine throttles up.

Other manufactures offer this on their premium tractors.

 

[dickfoster]

The feature on the throttle that when you press the pedal the engine throttles up.

Other manufactures offer this on their premium tractors.

Hey I have one of those, it's called the accelerator pedal. I have a hand throttle too. I have a gear tractor not sure about HST but I know they do have the cruise control option for the HST it's not needed with a gear because you have the hand throttle.

 

[AchingBack]

Throttle - Wikipedia
Internal combustion engines
A cross-section view of a throttle valve

In a petrol/gasoline internal combustion engine, the throttle is a valve that directly adjusts the amount of air entering the engine, indirectly controlling the charge (fuel + air) burned on each cycle due to the fuel-injector or carburetor maintaining a relatively constant fuel/air ratio. In a motor vehicle the control used by the driver to regulate power is sometimes called the throttle pedal, as it controls the throttle opening, although "accelerator pedal" is more accurate, since not all vehicles have throttles. A diesel engine does not have a throttle except there is a throttle valve on the newer diesel engines which is generally referred to as air management valves. Air management valves can be with or without integrated control electronics. Air management valves throttle the intake air in the intake air system of diesel engines via electromotive means in order to achieve precision controlled exhaust gas recirculation and prevent the inconvenient shaking that would otherwise occur when the engine is switched off. [1] The power level of a diesel is controlled by regulating the fuel flow into the engine, thus "throttle" and "gas pedal" are both inaccurate terms when applied to any modern computerized engine, diesel or not. Both types (gas and diesel) are now true throttle- by- wire computerized systems with the main difference being that in gasoline engines, the throttle position ultimately controls the amount of air getting into the engine with the computer supplying the fuel via the fuel injectors; whereas in a diesel the throttle position really only informs the computer to supply the amount of fuel via the injectors and in some newer models the actual diesel fuel pressure.[2]

 

[oldpilgrim]

Hey I have one of those, it's called the accelerator pedal. I have a hand throttle too. I have a gear tractor not sure about HST but I know they do have the cruise control option for the HST it's not needed with a gear because you have the hand throttle.

The HST has a hand throttle too. The cruise control is a device that sets the HST tranny to a particular spot, basically keeping it in the same 'gear' and allowing you to take your foot off the pedal.

 

[RNeumann]

The feature on the throttle that when you press the pedal the engine throttles up.

Other manufactures offer this on their premium tractors.

We are trying to be helpful but the wording of your post is cryptic at best. What I'm gathering is you have seen a feature that increases engine RPM when the HST pedal is pressed? Then again, maybe it's an accelerator pedal you are thinking of? If explaining it is too difficult (genuine intent, not sarcasm.......I think- that part was sarcasm. Dam it I'll stop now) please provide the brand of tractor and name of feature you are describing. We are happy to help as most here are happy to talk tractors!

 

[RNeumann]

Throttle - Wikipedia
Internal combustion engines
A cross-section view of a throttle valve

In a petrol/gasoline internal combustion engine, the throttle is a valve that directly adjusts the amount of air entering the engine, indirectly controlling the charge (fuel + air) burned on each cycle due to the fuel-injector or carburetor maintaining a relatively constant fuel/air ratio. In a motor vehicle the control used by the driver to regulate power is sometimes called the throttle pedal, as it controls the throttle opening, although "accelerator pedal" is more accurate, since not all vehicles have throttles. A diesel engine does not have a throttle except there is a throttle valve on the newer diesel engines which is generally referred to as air management valves. Air management valves can be with or without integrated control electronics. Air management valves throttle the intake air in the intake air system of diesel engines via electromotive means in order to achieve precision controlled exhaust gas recirculation and prevent the inconvenient shaking that would otherwise occur when the engine is switched off. [1] The power level of a diesel is controlled by regulating the fuel flow into the engine, thus "throttle" and "gas pedal" are both inaccurate terms when applied to any modern computerized engine, diesel or not. Both types (gas and diesel) are now true throttle- by- wire computerized systems with the main difference being that in gasoline engines, the throttle position ultimately controls the amount of air getting into the engine with the computer supplying the fuel via the fuel injectors; whereas in a diesel the throttle position really only informs the computer to supply the amount of fuel via the injectors and in some newer models the actual diesel fuel pressure.[2]

This is why I switched the RPM increasing device on the floorboard of my diesel truck to a gas pedal. It's much faster now!

 

[audsp98]

We are trying to be helpful but the wording of your post is cryptic at best. What I'm gathering is you have seen a feature that increases engine RPM when the HST pedal is pressed? Then again, maybe it's an accelerator pedal you are thinking of? If explaining it is too difficult (genuine intent, not sarcasm.......I think- that part was sarcasm. Dam it I'll stop now) please provide the brand of tractor and name of feature you are describing. We are happy to help as most here are happy to talk tractors!

Kubota calls it auto throttle advance, JD just calls it auto throttle. MF and Kioti offer it as well.

Found this description in another forum discussing Kubota's HST+ transmission.
"As you increase the down pressure on the direction pedal; the engine RPMS will automatically increase as well. As you release the direction pedal, engine rpm's drop down to idle. Gas saver, quieter, less engine wear."

 

[RNeumann]

I have a 1538 and have not found that feature. I looked at the Kubota and Kioti very seriously with test drives etc. I was never told about or saw that feature. Is this something on larger machines?

 

[npalen]

Seems like it would not be too difficult to add some linkage to a hydrostat to accomplish the auto throttle advance at least in the forward direction. My concern, however, would be whether the throttle linkage into the pump would wear prematurely.

 

[chuck172]

I really thought someone would have invented a kit to convert the standard hst into the auto-throttle feature. Should be simple.

 

[RNeumann]

I read a little about the Kubota version and got the impression it would maintain a set RPM no matter the load. Interesting concept either way. I personally don't see a use for it for what I do. Hopefully someone who has or used the feature or can weigh in with its purpose.

 

[Uncle Hulka]

My 580CK Case TLB had such a feature (i.e. both a foot and hand throttle). Handy, but infrequently used.

My 2555HST does not have such an arrangement. It does, however, have Cruise Control and Load Sense. I use both of these features when I am snow-blowing. It's an Erskine 73" loader-mount w/3-pt PTO Hydraulic power plant. I set the cruise control to an appropriate speed for the amount of snow, then engage the Load Sense. If I hit a deep section, the tractor speed is decreased just enough to maintain the RPM speed. When I'm out of the deep stuff, the tractor automatically returns to the set cruise speed. Really helpful!!!

 

[JerryK]

My 2555 also has cruise/load sense/and HST response switch. I tried all of them once, just like the radio. Probably never use them. I have cruise on my 2011 5035 , and used it just once, too... Not that I am unhappy they are there, but I don't really need them. Just like OnStar and Sirus on my new truck....

 

[IH782]

With Mahindra, anything 50hp and up has load sensing, which prevents the tractor from stalling while still maintaining forward motion. Believe it or not its more of an EPA thing.

 

[DavesTractor]

We sell Mahindra as well as other brands. The newest Branson 15/20/25 series have this feature that links the throttle with the pedal. I think they call it the Hydro-Max. I know other brands have it as well, although not Mahindra at this point. I find this feature to be really nice, enough so that I can't see why all HST aren't built this way. I don't see a downside, other than cost.

When the Branson rep told me this feature was coming, I yawned. Then I drove one...pretty cool.

 

[adventure bob]

I have a L4060 Kub and the auto throttle essentially makes it drive like an automatic car. Step on the forward pedal, engine RPMs come up, tractor goes the direction of the pedal. Doesn't matter how much is the bucket or what your pulling. Again simplest analogy is a car with an automatic trans, except there's a pedal for reverse so you don't have to shift into R.
Kub also has a feature called stall guard on its auto throttle that will rev the engine so that you cant kill it. These features work excellent if your doing constant back/fwd with lift and load.
AT is programmable through the screen for how quick it responds and how high max RPM is. Also has cruise control that is set to cover ground at a constant speed. Hand throttle as well.

 

[ericm979]

Massey has it on some of the higher end compacts like the 1700 series. I don't know about Branson but on Masseys it's adjustable.
It seems like it'd be nice for loader work, so the engine's not revving all the time. They also call it stall guard.