# US 11,897,474 B1 · Fuel efficient operation mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,897,474 B1 - Document ID: US11897474B1 - Status: Granted - Kind: B1 - Application number: 18/138,958 - Filed: 2023-04-25 - Granted: 2024-02-13 - Earliest claimed: 2023-04-25 - Assignees: CNH Industrial America LLC - Applicants: CNH Industrial America LLC - Inventors: Kushan Vora; Joseph Shoemaker; Haibo Guo - Web page: https://patentgrep.com/patent/US11897474B1 ## CPC - B60W 30/1882: {characterised by the working point of the engine, e.g. by using engine output chart} - B60W 10/06: including control of combustion engines - B60W 10/103: of fluid type - E02F 9/2066: {of the type combustion engines} - E02F 9/2235: {including an electronic controller} - E02F 9/2296: {Systems with a variable displacement pump} - F02D 29/04: peculiar to engines driving pumps - F02D 31/001: {Electric control of rotation speed} - F02D 41/021: {Introducing corrections for particular conditions exterior to the engine (conjoint control of vehicle sub-units for propelling the vehicle B60W30/18)} - F16H 61/42: involving adjustment of a pump or motor with adjustable output or capacity - F16H 61/46: Automatic regulation in accordance with output requirements - B60W 2510/0638: Engine speed - B60W 2710/0644: Engine speed - B60Y 2200/411: Bulldozers, Graders - F02D 2200/0625: Fuel consumption, e.g. measured in fuel liters per 100 kms or miles per gallon - F02D 2200/1002: Output torque - F02D 2200/101: Engine speed - F02D 2200/60: said parameters being related to the driver demands or status - F16H 2059/366: {Engine or motor speed} - F16H 2061/0096: {using a parameter map} - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F16H: GEARING - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY ## Abstract A system includes a vehicle controller which includes a memory configured to store instructions and one or more processors. The vehicle controller is configured to set a fuel efficient operation mode. The fuel efficient operation mode includes setting a commanded engine speed to a nominal engine speed located within a range of optimal fuel efficiency engine speeds of a brake specific fuel consumption map. The fuel efficient operation mode also includes instructing an engine to operate at the commanded engine speed. The fuel efficient operation mode also includes determining a monitored engine speed. The fuel efficient operation mode also includes adjusting a commanded pump displacement in response to the monitored engine speed exceeding the range of optimal fuel efficiency engine speeds. The fuel efficient operation mode also includes instructing a hydraulic pump to operate at the commanded pump displacement. ## Claims ### Claim 1 A system, comprising: a vehicle controller, wherein the vehicle controller comprises: a memory configured to store instructions; and one or more processors, wherein the vehicle controller is configured to: set a fuel efficient operation mode, wherein the fuel efficient operation mode comprises: setting a commanded engine speed to a nominal engine speed located within a range of optimal fuel efficiency engine speeds of a brake specific fuel consumption map; instructing an engine to operate at the commanded engine speed; determining a monitored engine speed; adjusting a commanded pump displacement in response to the monitored engine speed exceeding the range of optimal fuel efficiency engine speeds; and instructing a hydraulic pump to operate at the commanded pump displacement. ### Claim 2 (depends on 1) The system of claim 1, wherein the vehicle controller is configured to transition from the fuel efficient operation mode to an engine operation mode, the engine operation mode comprising: receiving a signal from an input device; adjusting the commanded engine speed in response to receiving the signal; and instructing the engine to operate at the commanded engine speed. ### Claim 3 (depends on 1) The system of claim 1, wherein the vehicle controller is configured to transition from the fuel efficient operation mode to a pump operation mode, the pump operation mode comprising: receiving a signal from an input device; adjusting the commanded pump displacement in response to receiving the signal; and instructing the pump to operate at the commanded pump displacement. ### Claim 4 (depends on 1) The system of claim 1, wherein the vehicle controller is configured to transition from the fuel efficient operation mode to a motor operation mode, the motor operation mode comprising: receiving a signal from an input device; adjusting a commanded motor displacement in response to receiving the signal; and instructing the motor to operate at the commanded motor displacement. ### Claim 5 (depends on 3) The system of claim 3, wherein adjusting the commanded pump displacement comprises: decreasing the commanded pump displacement in response to the monitored engine speed falling below the range of optimal fuel efficiency engine speeds; and increasing the commanded pump displacement in response to the monitored engine speed rising above the range of optimal fuel efficiency engine speeds. ### Claim 6 (depends on 4) The system of claim 4, wherein adjusting the commanded motor displacement comprises: increasing the commanded motor displacement in response to the monitored engine speed falling below the range of optimal fuel efficiency engine speeds; and decreasing the commanded motor displacement in response to the monitored engine speed rising above the range of optimal fuel efficiency engine speeds. ### Claim 7 (depends on 1) The system of claim 1, wherein the vehicle controller is configured to set the fuel efficient operation mode in response to receiving a signal from a user interface. ### Claim 8 (depends on 1) The system of claim 1, wherein the fuel efficient operation mode comprises maintaining the commanded pump displacement at a nominal pump displacement in response to the monitored engine speed not exceeding the range of optimal fuel efficiency engine speeds. ### Claim 9 A method comprising: setting, via a controller having a memory and a processor, a commanded engine speed to a nominal engine speed located within a range of optimal fuel efficiency engine speeds of a brake specific fuel consumption map; instructing, via the controller, an engine to operate at the commanded engine speed; determining, via the controller, a monitored engine speed; adjusting, via the controller, a commanded pump displacement in response to the monitored engine speed exceeding the range of optimal fuel efficiency engine speeds; and instructing, via the controller, a hydraulic pump to operate at the commanded pump displacement. ### Claim 10 (depends on 9) The method of claim 9, comprising maintaining, via the controller, the commanded pump displacement at a nominal pump displacement in response to the monitored engine speed not exceeding the range of optimal fuel efficiency engine speeds. ### Claim 11 (depends on 9) The method of claim 9, comprising: decreasing, via the controller, the commanded pump displacement in response to the monitored engine speed falling below the range of optimal fuel efficiency engine speeds; and increasing, via the controller, the commanded pump displacement in response to the monitored engine speed rising above the range of optimal fuel efficiency engine speeds. ### Claim 12 A work vehicle, comprising: a hydrostatic drive, comprising: a motor; a pump configured to provide hydraulic fluid to the motor; an engine configured to power the pump; and a vehicle controller, wherein the vehicle controller comprises: a memory configured to store instructions; and a one or more processors configured to execute the instructions, wherein the vehicle controller is configured to set a fuel efficient operation mode, wherein the fuel efficient operation mode comprises: setting a commanded engine speed to a nominal engine speed located within a range of optimal fuel efficiency engine speeds of a brake specific fuel consumption map; instructing the engine to operate at the commanded engine speed; determining a monitored engine speed; adjusting a commanded pump displacement in response to the monitored engine speed exceeding the range of optimal fuel efficiency engine speeds; and instructing a hydraulic pump to operate at the commanded pump displacement. ### Claim 13 (depends on 12) The work vehicle of claim 12, wherein the brake specific fuel consumption map comprises a plurality of ranges corresponding to a plurality of levels of fuel efficiency, and the vehicle controller is configured to select the range of optimal fuel efficiency engine speeds from the plurality of ranges in response to operator input. ### Claim 14 (depends on 12) The work vehicle of claim 12, wherein the vehicle controller is configured to output a signal indicative of instructions to present an indication in response to the monitored engine speed exceeding the range of optimal fuel efficiency engine speeds. ### Claim 15 (depends on 12) The work vehicle of claim 12, wherein the vehicle controller is configured to set the fuel efficient operation mode in response to a startup sequence of the work vehicle, a signal received by an input device, or a combination thereof. ### Claim 16 (depends on 12) The work vehicle of claim 12, wherein the vehicle controller is configured to transition from the fuel efficient operation mode to an engine operation mode, the engine operation mode comprising: receiving a signal from an input device; adjusting the commanded engine speed in response to receiving the signal; and instructing the engine to operate at the commanded engine speed. ### Claim 17 (depends on 12) The work vehicle of claim 12, wherein the vehicle controller is configured to transition from the fuel efficient operation mode to a pump operation mode, the pump operation mode comprising: receiving a signal from an input device; adjusting the commanded pump displacement in response to receiving the signal; and instructing the pump to operate at the commanded pump displacement. ### Claim 18 (depends on 12) The work vehicle of claim 12, wherein the vehicle controller is configured to transition from the fuel efficient operation mode to a motor operation mode, the motor operation mode comprising: receiving a signal from an input device; adjusting a commanded motor displacement in response to receiving the signal; and instructing the motor to operate at the commanded motor displacement. ### Claim 19 (depends on 17) The work vehicle of claim 17, wherein adjusting the commanded pump displacement comprises: decreasing the commanded pump displacement in response to the monitored engine speed falling below the range of optimal fuel efficiency engine speeds; and increasing the commanded pump displacement in response to the monitored engine speed rising above the range of optimal fuel efficiency engine speeds. ### Claim 20 (depends on 18) The work vehicle of claim 18, wherein adjusting the commanded motor displacement comprises: increasing the commanded motor displacement in response to the monitored engine speed falling below the range of optimal fuel efficiency engine speeds; and decreasing the commanded motor displacement in response to the monitored engine speed rising above the range of optimal fuel efficiency engine speeds.