# US 10,371,078 B2 · Engine starter controller, engine start apparatus, and engine starter control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,078 B2 - Document ID: US10371078B2 - Status: Granted - Kind: B2 - Application number: 15/821,903 - Filed: 2017-11-24 - Published: 2018-05-31 - Granted: 2019-08-06 - Earliest claimed: 2016-11-25 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Tatsuya Fujita - Web page: https://patentgrep.com/patent/US10371078B2 ## CPC - F02D 41/221: {relating to the failure of actuators or electrically driven elements} - F02D 41/062: {for starting (F02D41/061 takes precedence)} - F02D 41/3005: {Details not otherwise provided for} - F02N 11/006: {using a plurality of electric motors} - F02N 11/08: Circuits specially adapted for starting of engines - F02N 11/0818: {Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode} - F02N 11/0848: {with means for detecting successful engine start, e.g. to stop starter actuation} - F02N 11/108: {for diagnosis of the starter or its components} - F02D 41/26: using computer, e.g. microprocessor - F02N 11/04: the motors being associated with current generators - F02N 15/067: {the starter comprising an electro-magnetically actuated lever} - F02N 15/08: the gearing being of friction type - F02N 2200/0801: Vehicle speed - F02N 2200/101: Accelerator pedal position - F02N 2200/102: Brake pedal position - F02N 2300/2002: using different starting modes, methods, or actuators depending on circumstances, e.g. engine temperature or component wear - F02N 2300/302: using data communication - Y02T 10/40: Engine management systems - 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 A starter controller incorporated in a starter control system for controlling actuation of a first starter and a second starter to start an engine. The second starter is an alternating-current (AC) starter. The starter control system actuates the first starter in response to an engine start-up request, deactivates the first starter before completion of engine start-up, and activates the second starter while the second starter is being rotated by rotation of an engine rotary shaft. In the starter controller, a determination unit is configured to, under a condition where the engine rotary shaft is rotating after deactivation of the first starter, determine whether or not recognition of rotation of the second starter is complete. A fail-safe unit is configured to, if the recognition of rotation of the second starter is complete, perform predefined fail-safe processing responding to an abnormality in the second starter. ## Claims ### Claim 1 A starter controller incorporated in a starter control system for controlling actuation of a first starter and a second starter to start an engine, the second starter being an alternating-current (AC) starter, the system being configured to start actuation of the first starter in response to an engine start-up request, and before completion of engine start-up, terminate the actuation of the first starter and then start actuation of the second starter while the second starter is being rotated by rotation of an engine rotary shaft caused by the actuation of the first starter, the starter controller comprising: a determination unit configured to, under a condition where the engine rotary shaft is rotating after termination of the actuation of the first starter, determine whether or not recognition of rotation of the second starter is complete; and a fail-safe unit configured to, when the determination unit determines that the recognition of rotation of the second starter is not complete, perform predefined fail-safe processing responding to an abnormality in the second starter, after the termination of the actuation of the first starter. ### Claim 2 (depends on 1) The starter controller according to claim 1, wherein the fail-safe unit is configured to, in the predefined fail-safe processing, output a signal for re-actuating the first starter. ### Claim 3 (depends on 2) The starter controller according to claim 2, wherein: the starter control system further comprises a first-starter controller configured to control actuation of the first starter, the first-starter controller being in communication with the starter controller; the starter controller further comprises a rotation recognition unit configured to initiate the recognition of rotation of the second starter in response to an actuation command signal received from the first-starter controller; and the fail-safe unit is configured to, in the predefined fail-safe processing, output to the first-starter controller the signal for re-actuating the first starter. ### Claim 4 (depends on 1) The starter controller according to claim 1, wherein the determination unit is configured to, at least when determining that the second starter is in a rotating state, when determining that a phase to be excited to actuate the second starter has been detected, or when determining that the actuation of the second starter has been started, determine that the recognition of rotation of the second starter is complete. ### Claim 5 An engine start apparatus comprising: a starter controller incorporated in a starter control system for controlling actuation of a first starter and a second starter to start an engine, the system being configured to start actuation of the first starter in response to an engine start-up request, and before completion of engine start-up, terminate the actuation of the first starter and then start actuation of the second starter while the second starter is being rotated by rotation of an engine rotary shaft caused by the actuation of the first starter; the second starter that is an alternating-current (AC) starter; and a rotation detector configured to detect rotation of the second starter based on an induced voltage or induced current generated in coils of the second starter, wherein the starter controller comprises: a determination unit configured to, under a condition where the engine rotary shaft is rotating after termination of the actuation of the first starter, determine whether or not recognition of rotation of the second starter is complete; and a fail-safe unit configured to, when the determination unit determines that the recognition of rotation of the second starter is not complete, perform predefined fail-safe processing responding to an abnormality in the second starter, after the termination of the actuation of the first starter. ### Claim 6 (depends on 5) The engine start apparatus according to claim 5, wherein the fail-safe unit is configured to, in the predefined fail-safe processing, output a signal for re-actuating the first starter. ### Claim 7 (depends on 6) The engine start apparatus according to claim 6, wherein: the starter control system further comprises a first-starter controller configured to control actuation of the first starter, the first-starter controller being in communication with the starter controller; the starter controller further comprises a rotation recognition unit configured to initiate the recognition of rotation of the second starter in response to an actuation command signal received from the first-starter controller; and the fail-safe unit is configured to, in the predefined fail-safe processing, output to the first-starter controller the signal for re-actuating the first starter. ### Claim 8 (depends on 5) The engine start apparatus according to claim 5, wherein the determination unit is configured to, at least when determining that the second starter is in a rotating state, when determining that a phase to be excited to actuate the second starter has been detected, or when determining that the actuation of the second starter has been started, determine that the recognition of rotation of the second starter is complete. ### Claim 9 A starter control system for controlling actuation of a first starter and a second starter to start an engine, the system being configured to start actuation of the first starter in response to an engine start-up request, and before completion of engine start-up, terminate the actuation of the first starter and then start actuation of the second starter while the second starter is being rotated by rotation of an engine rotary shaft caused by the actuation of the first starter, the starter control system comprising: a first controller configured to control actuation of the first starter; and a second controller configured to control actuation of the second starter that is an alternating-current (AC) starter, the second controller being communicable with the first controller, the second controller comprising: a determination unit configured to, under a condition where the engine rotary shaft is rotating after termination of the actuation of the first starter, determine whether or not recognition of rotation of the second starter is complete; and a fail-safe unit configured to, when the determination unit determines that the recognition of rotation of the second starter is not complete, perform predefined fail-safe processing responding to an abnormality in the second starter, after the termination of the actuation of the first starter, wherein: the fail-safe unit of the second controller is configured to, in the predefined fail-safe processing, output a signal for re-actuating the first starter; and the first controller is configured to, upon receipt of the signal for re-actuating the first starter from the second controller, re-actuate the first starter. ### Claim 10 (depends on 9) The starter control system according to claim 9, wherein the first controller is configured to, when the determination unit of the second controller determines that the recognition of rotation of the second starter is not complete, re-actuate the first starter and start controlling combustion of the engine. ### Claim 11 (depends on 9) The starter control system according to claim 9, wherein the first controller is configured to, when, after re-actuation of the first starter is started, the determination unit of the second controller determines that the recognition of rotation of the second starter is not complete, start controlling combustion of the engine before terminating the re-actuation of the first starter. ### Claim 12 (depends on 9) The starter control system according to claim 9, wherein the first controller is configured to, when, after re-actuation of the first starter is started, the determination unit of the second controller determines that the recognition of rotation of the second starter is not complete, turn off an actuation command for the second starter. ### Claim 13 A starter controller incorporated in a starter control system for controlling actuation of a first starter and a second starter to start an engine, the second starter being an alternating-current (AC) starter, the system being configured to start actuation of the first starter to crank the engine in response to an engine start-up request, and before completion of engine start-up, terminate the actuation of the first starter and then start actuation of the second starter to rotate an engine rotary shaft while the second starter is being rotated by rotation of the engine rotary shaft, the rotation of the engine rotary shaft being caused by the first starter cranking the engine, the starter controller comprising: a determination unit configured to, under a condition where the engine rotary shaft is rotating after termination of the actuation of the first starter, determine whether or not recognition of rotation of the second starter is complete; and a fail-safe unit configured to, when the determination unit determines that the recognition of rotation of the second starter is not complete, perform predefined fail-safe processing responding to an abnormality in the second starter, after the termination of the actuation of the first starter.