# US 10,480,643 B2 · Hydraulic control system of automatic transmission for vehicle provided with idle stop and go system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,643 B2 - Document ID: US10480643B2 - Status: Granted - Kind: B2 - Application number: 15/621,576 - Filed: 2017-06-13 - Published: 2018-06-14 - Granted: 2019-11-19 - Earliest claimed: 2016-12-12 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Jin Young Hwang - Web page: https://patentgrep.com/patent/US10480643B2 ## CPC - F16H 61/0031: {using auxiliary pumps, e.g. pump driven by a different power source than the engine} - F15B 11/17: using two or more pumps - F15B 13/026: {Pressure compensating valves} - F15B 13/027: {Check valves} - F15B 13/06: for use with two or more servomotors - F15B 2211/2053: Type of pump - F15B 2211/20576: with multiple pumps - F15B 2211/2656: by control of the pumps - F16H 59/74: Inputs being a function of engine parameters (F16H59/14 takes precedence) - F16H 61/30: Hydraulic {or pneumatic} motors {or related fluid control means} therefor - F16H 2059/746: {Engine running state, e.g. on-off of ignition switch} - F16H: GEARING - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ## Abstract A hydraulic control system of an automatic transmission for a vehicle provided with an ISG system is disclosed. The hydraulic control system may include: a mechanical hydraulic pump driven by an engine; a linear solenoid valve to control hydraulic pressure generated by the mechanical hydraulic pump; a first switch valve to selectively supply or not to supply controlled hydraulic pressure to one of friction members; an electric hydraulic pump driven by electric energy; and a second switch valve to selectively supply the hydraulic pressure, generated by the electric hydraulic pump, to the one friction member or to the linear solenoid valve. The hydraulic control system supplies the hydraulic pressure to one of the friction members operated at a gear stage where starting control is performed. ## Claims ### Claim 1 A hydraulic control system of an automatic transmission for a vehicle provided with an idle stop and go (ISG) system, the hydraulic control system configured to supply hydraulic pressure to at least one friction member of friction members operated at a gear stage where starting control is performed, the hydraulic control system comprising: a mechanical hydraulic pump driven by torque of an engine and configured to pump a fluid stored in an oil pan; a regulator valve configured to regulate hydraulic pressure fed from the mechanical hydraulic pump to be stable; a manual valve configured to receive the hydraulic pressure from the regulator valve through a first hydraulic line and to supply the hydraulic pressure to a second hydraulic line by manipulation of a shift lever; a linear solenoid valve configured to control the hydraulic pressure supplied from the manual valve through the second hydraulic line and to supply the controlled hydraulic pressure to a third hydraulic line; a first switch valve configured to selectively supply the hydraulic pressure supplied from the linear solenoid valve through the third hydraulic line to the at least one friction member through a fourth hydraulic line; and an electric hydraulic pump driven by electric energy and configured to pump the fluid stored in the oil pan through a fifth hydraulic line and to feed the pumped fluid to a second switch valve through a sixth hydraulic line, wherein the second switch valve is configured to supply the hydraulic pressure of the electric hydraulic pump supplied through the sixth hydraulic line to a seventh hydraulic line connected to the fourth hydraulic line, or to the second hydraulic line at an upstream side of the linear solenoid valve through an eighth hydraulic line. ### Claim 2 (depends on 1) The hydraulic control system of claim 1, wherein a check valve and an orifice are disposed in parallel with each other on the second hydraulic line at the upstream side of the linear solenoid valve. ### Claim 3 (depends on 1) The hydraulic control system of claim 1, wherein the first switch valve is configured to connect the third hydraulic line and the fourth hydraulic line when the hydraulic pressure of the second hydraulic line is supplied to the first switch valve as control pressure. ### Claim 4 (depends on 1) The hydraulic control system of claim 1, wherein the second switch valve is configured to connect the sixth hydraulic line and the eighth hydraulic line when the hydraulic pressure of the second hydraulic line is supplied to the second switch as control pressure, and to connect the sixth hydraulic line and the seventh hydraulic line when the control pressure of the second hydraulic line is not supplied to the second switch valve. ### Claim 5 (depends on 4) The hydraulic control system of claim 4, wherein the second switch valve is configured to supply the hydraulic pressure of the electric hydraulic pump to the linear solenoid valve through the sixth hydraulic line and the eighth hydraulic line in a static shift from a drive (D) range to a neutral (N) range. ### Claim 6 (depends on 1) The hydraulic control system of claim 1, wherein the electric hydraulic pump is a solenoid pump. ### Claim 7 (depends on 1) The hydraulic control system of claim 1, wherein a second check valve configured to inhibit the hydraulic pressure from flowing back to the second switch valve is disposed on the eighth hydraulic line. ### Claim 8 A hydraulic control system of an automatic transmission for a vehicle provided with an idle stop and go (ISG) system, the hydraulic control system configured to supply hydraulic pressure to at least one friction member of friction members operated at a gear stage where starting control is performed, the hydraulic control system comprising: a mechanical hydraulic pump driven by an engine; a linear solenoid valve configured to control hydraulic pressure generated by the mechanical hydraulic pump or supplied hydraulic pressure; a first switch valve configured selectively to supply or not to supply the controlled hydraulic pressure to the at least one friction member; an electric hydraulic pump driven by electric energy; and a second switch valve configured to selectively supply the hydraulic pressure, generated by the electric hydraulic pump, to the at least one friction member or to the linear solenoid valve, wherein the first switch valve and the second switch valve are controlled by a same hydraulic pressure. ### Claim 9 (depends on 8) The hydraulic control system of claim 8, wherein the same hydraulic pressure is the hydraulic pressure generated by the mechanical hydraulic pump or the controlled hydraulic pressure. ### Claim 10 (depends on 9) The hydraulic control system of claim 9, wherein the first switch valve is configured to supply the hydraulic pressure supplied from the linear solenoid valve to the at least one friction member, and the second switch valve is configured to supply the hydraulic pressure generated by the electric hydraulic pump to the linear solenoid valve when the mechanical hydraulic pump generates the hydraulic pressure. ### Claim 11 (depends on 9) The hydraulic control system of claim 9, wherein the second switch valve is configured to supply the hydraulic pressure generated by the electric hydraulic pump to the at least one friction member when the mechanical hydraulic pump does not generate the hydraulic pressure.