# US 8,771,142 B2 · Controller of vehicle and control method of vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,142 B2 - Document ID: US8771142B2 - Status: Granted - Kind: B2 - Application number: 13/305,187 - Filed: 2011-11-28 - Published: 2012-05-31 - Granted: 2014-07-08 - Earliest claimed: 2010-11-30 - Assignees: JATCO Ltd - Applicants: Shinichiro Watanabe; Keichi Tatewaki; Naohiro Yamada; Hideshi Wakayama - Inventors: Shinichiro Watanabe; Keichi Tatewaki; Naohiro Yamada; Hideshi Wakayama - Web page: https://patentgrep.com/patent/US8771142B2 ## CPC - F02N 11/0833: {Vehicle conditions (F02N11/0822, F02N11/0825 take precedence)} - B60W 30/18072: {Coasting} - B60W 2030/18081: {With torque flow from driveshaft to engine, i.e. engine being driven by vehicle} - B60W 2510/0657: Engine torque - B60W 2720/106: Longitudinal acceleration - F16H 37/022: {the toothed gearing having orbital motion} - F16H 61/66259: {using electrical or electronical sensing or control means} - F16H 61/702: {using electric or electrohydraulic control means} - F16H 2037/023: {the combined gearing being provided with at least two forward and one reverse ratio in a serially arranged sub-transmission} - F16H 2312/14: Going to, or coming from standby operation, e.g. for engine start-stop operation at traffic lights - Y02T 10/40: Engine management systems - Y02T 10/60: Other road transportation technologies with climate change mitigation effect - F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR - 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 - F16H: GEARING - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A controller of a vehicle, provided with a coast stop control unit which automatically stops an engine during the travel of a vehicle if coast stop conditions are met during the travel of the vehicle, and the coast stop control unit automatically stops the engine at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less. ## Claims ### Claim 1 A controller of a vehicle, comprising a coast stop control unit which automatically stops an engine during the travel of a vehicle when coast stop conditions are met during the travel of the vehicle, wherein the coast stop control unit automatically stops the engine at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less. ### Claim 2 (depends on 1) The controller of a vehicle according to claim 1, further comprising: an acceleration determining means unit determines whether the change amount of the acceleration of the vehicle caused by the automatic stop of the engine becomes larger than the predetermined acceleration when the coast stop conditions are met; and a coast stop control prohibiting unit which prohibits the automatic stop of the engine by the coast stop control unit if it is determined that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration. ### Claim 3 (depends on 2) The controller of a vehicle according to claim 2, further comprising: a fluid transmitting device which is interposed between the engine and driving wheels and transmits a driving force of the engine to the driving wheels, wherein the acceleration determining unit determines that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration if a rotation ratio of the fluid transmitting device is smaller than a predetermined rotation ratio. ### Claim 4 (depends on 2) The controller of a vehicle according to claim 2, further comprising: a driving force detecting means which detects a driving force to be transmitted from the engine to driving wheels, wherein the acceleration determining means determines that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration if the detected driving force is larger than the predetermined driving force. ### Claim 5 (depends on 2) The controller of a vehicle according to claim 2, further comprising: a driving force detecting unit which detects a driving force to be transmitted from the engine to driving wheels, wherein the acceleration determining unit determines that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration if the detected driving force is in a state to be transmitted from the engine to the driving wheels. ### Claim 6 (depends on 1) The controller of a vehicle according to claim 1, further comprising: a fluid transmitting device which is interposed between the engine and driving wheels and transmits a driving force of the engine to the driving wheels, wherein the coast stop control unit automatically stops the engine if a rotation ratio of the fluid transmitting device is a predetermined rotation ratio or more. ### Claim 7 (depends on 1) The controller of a vehicle according to claim 1, further comprising: a driving force detecting unit which detects a driving force to be transmitted from the engine to driving wheels, wherein the coast stop control unit automatically stops the engine if the driving force detected by the driving force detecting unit is a predetermined driving force or less. ### Claim 8 (depends on 1) The controller of a vehicle according to claim 1, further comprising: a driving force detecting unit which detects a driving force to be transmitted from the engine to driving wheels, wherein the coast stop control unit automatically stops the engine if the driving force detected by the driving force detecting unit is in a state to be transmitted from the driving wheels to the engine. ### Claim 9 (depends on 3) A controller of a vehicle according to claim 3, wherein the predetermined rotation ratio is 1. ### Claim 10 (depends on 6) A controller of a vehicle according to claim 6, wherein the predetermined rotation ratio is 1. ### Claim 11 A control method of a vehicle, the control method comprising automatically stopping an engine during the travel of a vehicle if coast stop conditions are met during the travel of the vehicle, wherein the engine is automatically stopped at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less. ### Claim 12 A controller of a vehicle, comprising coast stop control means for automatically stopping an engine during the travel of a vehicle when coast stop conditions are met during the travel of the vehicle, wherein the coast stop control means automatically stops the engine at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less.