# US 8,543,318 B2 · Controlled engine shutdown system for a stop-start system and a hybrid electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,318 B2 - Document ID: US8543318B2 - Status: Granted - Kind: B2 - Application number: 12/835,835 - Filed: 2010-07-14 - Published: 2011-12-01 - Granted: 2013-09-24 - Earliest claimed: 2010-06-01 - Assignees: GM Global Technology Operations LLC - Applicants: Qi Ma; Robert Douglas Shafto - Inventors: Qi Ma; Robert Douglas Shafto - Web page: https://patentgrep.com/patent/US8543318B2 ## CPC - F02D 29/02: peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers - F02D 13/0219: {by shifting the phase, i.e. the opening periods of the valves are constant} - F02D 17/02: Cutting-out (cutting-out engines in multiple engine arrangements F02D25/04) - F02D 2041/0095: {Synchronisation of the cylinders during engine shutdown} - F02N 11/08: Circuits specially adapted for starting of engines - Y02T 10/12: Improving ICE efficiencies - 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) - F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An engine system includes a stop-start module that generates a shut down signal to shut down an engine. A friction module that generates a friction signal based on the engine shut down signal. The friction signal indicates an estimate of a sum of friction forces between components of the engine. A position module estimates a position of the engine and generates a position signal. An energy module estimates kinetic energy of the engine based on the friction signal and the position signal. A cylinder deactivation module stops the engine based on the kinetic energy in at least one of (i) a predetermined position and (ii) a predetermined range. ## Claims ### Claim 1 An engine system comprising: a stop-start module that generates a shut down signal to shut down an engine; a friction module that generates a friction signal based on the engine shut down signal, wherein the friction signal indicates an estimate of a sum of friction forces between components of the engine; a position module that estimates a position of the engine and generates a position signal; an energy module that estimates kinetic energy of the engine based on the friction signal and the position signal; and a cylinder deactivation module that stops the engine based on the kinetic energy in at least one of (i) a predetermined position and (ii) a predetermined range. ### Claim 2 (depends on 1) The engine system of claim 1, wherein the stop-start module generates the shut down signal based on an accelerator signal. ### Claim 3 (depends on 1) The engine system of claim 1, wherein the stop-start module generates the shut down signal based on at least one of a state of a power source and a speed of a vehicle. ### Claim 4 (depends on 1) The engine system of claim 1, wherein the friction module generates the friction signal based on a speed of the engine and a temperature of the engine. ### Claim 5 (depends on 1) The engine system of claim 1, wherein the friction module generates the friction signal based on a pressure of an intake manifold of the engine. ### Claim 6 (depends on 1) The engine system of claim 1, wherein the friction module generates the friction signal based on a position of a cam phaser of the engine. ### Claim 7 (depends on 1) The engine system of claim 1, wherein the position module generates the position signal based on a signal from a position sensor and a pressure of a manifold. ### Claim 8 (depends on 1) The engine system of claim 1, wherein: the cylinder deactivation module stops the engine in the predetermined range; the predetermined range is bounded by a first position and a second position; a gap of a position indicating wheel of the engine is 90° away from a position sensor when the engine is in the first position; and the gap of the position indicating wheel is 270° away from the position sensor when the engine is in the second position. ### Claim 9 (depends on 1) The engine system of claim 1, wherein: the cylinder deactivation module stops the engine in the predetermined position; the predetermined position is between a first position and a second position; a gap of a position indicating wheel of the engine is 90° away from a position sensor when the engine is in the first position; and the gap of the position indicating wheel is 270° away from the position sensor when the engine is in the second position. ### Claim 10 (depends on 9) The engine system of claim 9, wherein the predetermined position is greater than the first position away from the position sensor and less than he second position away from the position sensor. ### Claim 11 (depends on 1) The engine system of claim 1, further comprising a throttle module that controls position of a throttle of the engine based on a throttle control signal from the cylinder deactivation module to stop the engine in the at least one of (i) the predetermined position and (ii) the predetermined range. ### Claim 12 (depends on 1) The engine system of claim 1, further comprising: a shut down control module that generates a transmission request signal and comprises the cylinder deactivation module; and a transmission control module that adjusts load of the transmission on the engine based on the transmission request signal to stop the engine in the at least one of (i) the predetermined position and (ii) the predetermined range. ### Claim 13 (depends on 12) The engine system of claim 12, wherein the transmission control module adjusts at least one of an oil pressure, a state of a clutch, and a state of a gear to stop the engine in the at least one of (i) the predetermined position and (ii) the predetermined range. ### Claim 14 A method of operating a stop-start system comprising: generating a shut down signal to shut down an engine; generating a friction signal based on the engine shut down signal, wherein the friction signal indicates an estimate of a sum of friction forces between components of the engine; estimating a position of the engine and generating a position signal; estimating kinetic energy of the engine based on the friction signal and the position signal; and stopping the engine based on the kinetic energy in at least one of (i) a predetermined position and (ii) a predetermined range. ### Claim 15 (depends on 14) The method of claim 14, wherein the shut down signal is generated based on an accelerator signal, a state of a power source, and a speed of a vehicle. ### Claim 16 (depends on 14) The method of claim 14, wherein the friction signal is generated based on a speed of the engine, a temperature of the engine, a pressure of an intake manifold of the engine, a position of a cam phaser of the engine. ### Claim 17 (depends on 14) The method of claim 14, further comprising stopping the engine in the predetermined range, wherein: the predetermined range is bounded by a first position and a second position; a gap of a position indicating wheel of the engine is 90° away from a position sensor when the engine is in the first position; and the gap of the position indicating wheel is 270° away from the position sensor when the engine is in the second position. ### Claim 18 (depends on 14) The method of claim 14, further comprising stopping the engine in the predetermined position, wherein: the predetermined position is between a first position and a second position; a gap of a position indicating wheel of the engine is 90° away from a position sensor when the engine is in the first position; and the gap of the position indicating wheel is 270° away from the position sensor when the engine is in the second position. ### Claim 19 (depends on 14) The method of claim 14, further comprising: generating a transmission request signal; controlling position of a throttle of the engine based on a throttle control signal to stop the engine in the at least one of (i) the predetermined position and (ii) the predetermined range; and adjusting load of the transmission on the engine based on the transmission request signal to stop the engine in the at least one of (i) the predetermined position and (ii) the predetermined range.