A different method would be to make use of a variable displacement pump.  When the pump is configured for minimal displacement, it makes a minimal quantity of oil flow, leading to the hydraulic motor(s) to show additional gradually. In the Cvt transmission a v-formed metallic (rubber in some case) chain https://gearboxcvt97419.blue-blogs.com/39998733/the-basic-principles-of-gearbox-cvt