A hydrostatic traction drive system of a mobile machine has a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side. The hydraulic traction motors are operated in an open circuit and are jointly supplied with h
A hydrostatic traction drive system of a mobile machine has a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side. The hydraulic traction motors are operated in an open circuit and are jointly supplied with hydraulic fluid by a single hydraulic pump. The first hydraulic traction motor is controlled by a first control valve and the second hydraulic traction motor is controlled by a second control valve. The first hydraulic traction motor and the second hydraulic traction motor are each variable displacement motors with an electrically variable displacement volume, and the first control valve and the second control valve are electrically actuatable control valves.
대표청구항▼
1. A hydrostatic traction drive system of a mobile machine, comprising: a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side, wherein the first and second hydraulic traction motors are operated in an open ci
1. A hydrostatic traction drive system of a mobile machine, comprising: a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side, wherein the first and second hydraulic traction motors are operated in an open circuit and are jointly supplied with hydraulic fluid by a single hydraulic pump, wherein the first hydraulic traction motor is controlled by a first control valve and the second hydraulic traction motor is controlled by a second control valve, wherein the first hydraulic traction motor and the second hydraulic traction motor are each variable displacement motors with an electrically variable displacement volume, and the first control valve and the second control valve are each electrically actuatable control valves, wherein an electronic control device controls the displacement volumes of the first and second hydraulic traction motors and actuates the control valves, wherein the electronic control device is constructed such that during travel around a curve, inlet-side pressures of the first and second hydraulic traction motors are brought to the same pressure level by varying the displacement volume of one of the two traction motors and by actuation of the associated control valve. 2. The hydrostatic traction drive system as recited in claim 1, wherein for travel around a curve, the actuation of the control valve associated with the vehicle side on the inside of the curve is reduced by the electronic control device, and during travel around a curve the inlet-side pressure of the hydraulic traction motor on the inside of the curve is controlled by the electronic control device to the inlet-side pressure of the hydraulic traction motor on the outside of the curve in a closed-loop control. 3. The hydrostatic traction drive system as recited in claim 2, wherein for closed-loop control of the inlet-side pressure of the hydraulic motor on the inside of the curve, the displacement volume of the hydraulic traction motor on the inside of the curve is reduced by the electronic control device, and the actuation of the control valve associated with the hydraulic traction motor on the inside of the curve is reduced such that an increase in the speed of the traction motor on the inside of the curve is prevented. 4. The hydrostatic traction drive system as recited in claim 3, wherein the electronic control device calculates a volumetric flow demand of the hydraulic traction motor on the inside of the curve from a set displacement volume of the traction motor on the inside of the curve, and sets the control valve of the hydraulic traction motor on the inside of the curve to the calculated volumetric flow demand of the hydraulic traction motor on the inside of the curve. 5. The hydrostatic traction drive system as recited in claim 4, wherein the volumetric flow delivered to the control valve of the hydraulic traction motor on the inside of the curve is calculated by the electronic control device from an actuation signal of the associated control valve and a pressure differential at the associated control valve. 6. The hydrostatic traction drive system as recited in claim 1, wherein for travel around a curve, the actuation of the control valve associated with the vehicle side on the inside of the curve is reduced by the electronic control device, and during travel around the curve the inlet-side pressure of the hydraulic traction motor on the outside of the curve is controlled by the electronic control device to the inlet-side pressure of the traction motor on the inside of the curve in a closed-loop control. 7. The hydrostatic traction drive system as recited in claim 6, wherein for closed-loop control of the inlet-side pressure of the hydraulic traction motor on the outside of the curve, the displacement volume of the hydraulic traction motor on the outside of the curve is increased by the electronic control device and the actuation of the control valve associated with the hydraulic traction motor on the outside of the curve is increased such that a decrease in the speed of the traction motor on the outside of the curve is prevented. 8. The hydrostatic traction drive system as recited in claim 7, wherein the electronic control device calculates the volumetric flow demand of the hydraulic traction motor on the outside of the curve from the set displacement volume of the traction motor on the outside of the curve and sets the control valve of the hydraulic traction motor on the outside of the curve to the calculated volumetric flow demand of the hydraulic traction motor on the outside of the curve. 9. The hydrostatic traction drive system as recited in claim 8, wherein the volumetric flow delivered to the control valve of the hydraulic traction motor on the outside of the curve is calculated by the electronic control device from the actuation signal of the associated control valve and the differential pressure at the associated control valve. 10. The hydrostatic traction drive system as recited in claim 1, wherein the electronic control device is operatively connected with pressure sensors, by means of which the inlet-side pressure at the first hydraulic traction motor and at the second hydraulic traction motor are measured. 11. The hydrostatic traction drive system as recited in claim 1, wherein the first hydraulic traction motor drives a first caterpillar track of a first vehicle side of the mobile machine and the second hydraulic traction motor drives a second caterpillar track of the second vehicle side of the mobile machine. 12. A method for the operation of a hydrostatic traction drive system of a mobile machine, wherein the traction drive system has a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side, wherein the hydraulic traction motors are operated in an open circuit and are jointly supplied with hydraulic fluid by a single hydraulic pump, wherein the first hydraulic traction motor is controlled by a first control valve and the second hydraulic traction motor is controlled by a second control valve, wherein a speed differential is set on the hydraulic traction motors for travel around a curve, wherein, during travel around a curve, a displacement volume of the hydraulic traction motor on the inside of the curve is reduced and, simultaneously, by activation of the control valve associated with the hydraulic traction motor on the inside of the curve, the volumetric flow of hydraulic fluid delivered to the hydraulic traction motor on the inside of the curve is reduced such that the inlet-side pressure of the hydraulic traction motor on the inside of the curve is equalized with the inlet-side pressure of the hydraulic traction motor on the outside of the curve, and an increase in the speed of the hydraulic traction motor on the inside of the curve is prevented, orwherein, during travel around a curve, a displacement volume of the hydraulic traction motor on the outside of the curve is increased and, simultaneously, by activation of the control valve associated with the hydraulic traction motor on the outside of the curve, the volumetric flow of hydraulic fluid delivered to the hydraulic traction motor on the outside of the curve is increased such that the inlet-side pressure of the hydraulic traction motor on the outside of the curve is equalized with the inlet-side pressure of the hydraulic traction motor on the inside of the curve, and a decrease in the speed of the hydraulic traction motor on the outside of the curve is prevented.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (9)
Callahan William L. (Lafayette IN) Noah Bruce C. (W. Lafayette IN) Kulp Jonathan B. (Terre Hill PA), Apparatus for controlling a steering-by-driving system.
Hartung Erwin (Stockstadt DEX) Strenzke Hilmar (Aschaffenburg DEX), Process for adjusting the characteristics of infinitely variable transmissions of a vehicle.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.