# US 9,592,821 B2 · Drive system for hybrid vehicle with means for calculating engine torque based on motor torque > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,592,821 B2 - Document ID: US9592821B2 - Status: Granted - Kind: B2 - Application number: 14/410,643 - Filed: 2013-06-26 - Published: 2015-07-09 - Granted: 2017-03-14 - Earliest claimed: 2012-06-27 - Assignees: Scania CV AB - Applicants: Scania Cv AB - Inventors: Niklas Pettersson; Mikael Bergquist; Karl Redbrandt; Mathias Björkman; Johan Lindstrom - Web page: https://patentgrep.com/patent/US9592821B2 ## CPC - B60W 20/10: Controlling the power contribution of each of the prime movers to meet required power demand - B60K 6/365: with the gears having orbital motion - B60K 6/48: Parallel type - B60W 10/06: including control of combustion engines - B60W 20/50: Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode - B60W 50/0098: {Details of control systems ensuring comfort, safety or stability not otherwise provided for} - F02D 29/02: peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers - B60W 2050/0088: {Adaptive recalibration} - B60W 2510/0657: Engine torque - B60W 2510/083: Torque - B60Y 2200/92: Hybrid vehicles - B60Y 2300/18025: Drive off, accelerating from standstill - Y02T 10/62: Hybrid vehicles - Y10S 903/905: Combustion engine - 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 - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - 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) - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A drive system and a method of driving a vehicle (1). The drive system includes (1) a combustion engine (2), a gear box (3), an electric machine (9), and a planetary gear. A control unit (18) has access to information concerning the moment (Tel) of the electric machine (9) for driving the vehicle (1) and to calculate the moment (T1c) of the combustion engine (2) for driving the vehicle (1) at at least a first operation occasion (D1) when there is a known relation between the moment (Tel) of the electric machine and the moment (T1c) of the combustion engine. ## Claims ### Claim 1 A drive system for a vehicle, wherein the drive system comprises a combustion engine with an output shaft, a gear box with an input shaft, an electric machine which comprises a stator and a rotor, and a planetary gear which comprises a sun wheel, a ring wheel and a planet wheel holder, wherein the output shaft of the combustion engine is connected to a first of the components of the planetary gear such that rotation of the output shaft leads to rotation of the first component, the input shaft of the gear box is connected to a second of the components of the planetary gear such that rotation of the input shaft leads to rotation of the second component, and the rotor of the electric machine is connected to a third of the components of the planetary gear such that rotation of the rotor leads to rotation of the third component; the drive system comprises a control unit which has access to information concerning the moment of the electric machine for driving the vehicle based on knowledge of the electric energy led to or from the electric machine, and the control unit calculates the moment of the combustion engine for driving the vehicle at at least a first operation occasion when there is a known relation between the moment of the electric machine and the moment of the combustion engine based on knowledge of the moment of the electric machine, wherein the control unit is configured to compare the calculated moment of the combustion engine with a demanded moment of the combustion engine at the first operation occasion, and wherein the control unit is configured to store information concerning a deviation between the calculated moment of the combustion engine and the demanded moment of the combustion engine at the first operation occasion and to use the stored information for controlling the combustion engine at a second operation occasion. ### Claim 2 (depends on 1) A drive system according to claim 1, further comprising the control unit is configured to store information concerning the deviation between the calculated moment of the combustion engine and the demanded moment of the combustion engine at different operation states of the combustion engine. ### Claim 3 (depends on 2) A drive system according to claim 2, further comprising the control unit is configured to supplement and/or update the stored information concerning the deviation between the calculated moment of the combustion engine and the demanded moment of the combustion engine during subsequent first operation occasions. ### Claim 4 (depends on 1) A drive system according to claim 1, further comprising the control unit is configured to use the calculated moment of the combustion engine for controlling the combustion engine at second operation occasions when the combustion engine supplies the demanded moment. ### Claim 5 (depends on 4) A drive system according to claim 4, further comprising the control unit is configured to use the calculated moment of the combustion engine for controlling the combustion engine at second operation occasions. ### Claim 6 (depends on 1) A drive system according to claim 1, further comprising the planetary gear comprises a coupling member configured to lock the output shaft of the combustion engine and the input shaft of the gear box in relation to each other and the control unit is configured to determine the calculated moment of the combustion engine at first operation occasions when the coupling member is in a non-locked position in which the output and input shafts are rotatable with different rotation speeds. ### Claim 7 (depends on 1) A drive system according to claim 1, further comprising the control unit is configured to determine the calculated moment of the combustion engine with assistance from a correlation which comprises the transmission ratio between the output shaft of the combustion engine and the electric machine in the planetary gear, the moment of inertia of the electric machine, the moment of inertia of the combustion engine, the acceleration of the electric machine, and the acceleration of the combustion engine. ### Claim 8 (depends on 1) A drive system according to claim 1, further comprising the output shaft of the combustion engine is connected to the sun wheel of the planetary gear, the input shaft of the gear box is connected to the planet wheel holder of the planetary gear and the rotor of the electric machine is connected to the ring wheel of the planetary gear. ### Claim 9 (depends on 1) Vehicle comprising a drive system according to claim 1. ### Claim 10 A method of driving a vehicle, wherein the vehicle comprises a control unit, a combustion engine with an output shaft, a gear box with an input shaft, an electric machine which comprises a stator and a rotor, and a planetary gear which comprises a sun wheel, a ring wheel and a planet wheel holder, wherein the output shaft of the combustion engine is connected to a first of the components of the planetary gear such that rotation of the output shaft leads to rotation of the first component, the input shaft of the gear box is connected to a second of the components of the planetary gear such that rotation of the input shaft leads to rotation of the second component and the rotor of the electric machine is connected to a third of the components of the planetary gear such that rotation of the rotor leads to rotation of the third component; the method comprising the steps of providing to the control unit access to information concerning the moment of the electric machine for driving the vehicle based on gaining knowledge of the electric energy led to or from the electric machine, calculating with the control unit the moment of the combustion engine for driving the vehicle at at least a first operation occasion when there is a known relation between the moment of the electric machine and the moment of the combustion engine based on knowledge of the moment of the electric machine, comparing the calculated moment of the combustion engine with a demanded moment of the combustion engine at the first operation occasion, storing information concerning the deviation between the calculated moment of the combustion engine and the demanded moment of the combustion engine at the first operation occasion, and using the stored information for controlling the combustion engine at a second operation occasion. ### Claim 11 (depends on 10) A method according to claim 10, further comprising storing information concerning the deviation between the calculated moment of the combustion engine and the demanded moment of the combustion engine at different operation occasions of the combustion engine. ### Claim 12 (depends on 10) A method according to claim 10, further comprising supplementing and/or updating the stored information concerning the deviation between the calculated moment of the combustion engine and the demanded moment of the combustion engine during subsequent first operation occasions. ### Claim 13 (depends on 10) A method according to claim 10, further comprising using the calculated moment of the combustion engine for controlling the combustion engine at second operation occasions when the combustion engine is to supply the demanded moment. ### Claim 14 (depends on 13) A method according to claim 13, further comprising using the calculated moment of the combustion engine for controlling the combustion engine at second operation occasions. ### Claim 15 (depends on 10) A method according to claim 10, further comprising locking the output shaft of the combustion engine and the input shaft of the gear box in relation to each other with a coupling member and determining the calculated moment of the combustion engine at first operation occasions when the coupling member is in a non-locked position in which the output and input shafts are rotatable with different rotation speeds. ### Claim 16 (depends on 10) A method according to claim 10, further comprising determining the calculated moment of the combustion engine with help of a correlation which comprises the transmission ratio between the output shaft of the combustion engine and the electric machine in the planetary gear, the moment of inertia of the electric machine, the moment of inertia of the combustion engine, the acceleration of the electric machine, and the acceleration of the combustion engine. ### Claim 17 (depends on 10) A method according to claim 10, further comprising connecting the output shaft of the combustion engine to the sun wheel of the planetary gear, connecting the input shaft of the gear box to the planet wheel holder of the planetary gear and connecting the rotor of the electric machine to the ring wheel of the planetary gear. ### Claim 18 A non-transitory computer program product comprising a non-volatile data storage medium on which computer code is stored and which is readable by a computer, wherein the computer program code of the computer program product causes a computer to implement a method when the computer program code is executed in the computer, the method comprising driving a vehicle, wherein the vehicle comprises a control unit, a combustion engine with an output shaft, a gear box with an input shaft, an electric machine which comprises a stator and a rotor, and a planetary gear which comprises a sun wheel, a ring wheel and a planet wheel holder, wherein the output shaft of the combustion engine is connected to a first of the components of the planetary gear such that rotation of the output shaft leads to rotation of the first component, the input shaft of the gear box is connected to a second of the components of the planetary gear such that rotation of the input shaft leads to rotation of the second component and the rotor of the electric machine is connected to a third of the components of the planetary gear such that rotation of the rotor leads to rotation of the third component; the method comprising the steps of providing to the control unit access to information concerning the moment of the electric machine for driving the vehicle based on gaining knowledge of the electric energy led to or from the electric machine, calculating with the control unit the moment of the combustion engine for driving the vehicle at at least a first operation occasion when there is a known relation between the moment of the electric machine and the moment of the combustion engine based on knowledge of the moment of the electric machine, comparing the calculated moment of the combustion engine with a demanded moment of the combustion engine at the first operation occasion, storing information concerning the deviation between the calculated moment of the combustion engine and the demanded moment of the combustion engine at the first operation occasion, and using the stored information for controlling the combustion engine at a second operation occasion.