Methods, apparatus, systems, and articles of manufacture are disclosed to monitor engine starting systems. An example apparatus includes processor circuitry to execute instructions to measure engine starting system data from a machine; determine a total starting crank time and an ambient air temperature for the machine from the engine starting system data; compare the engine starting system data using a machine learning model; model a relationship between the ambient air temperature and the total starting crank time; generate a score of an engine starting system from the machine learning model; determine comparison result from the relationship between the ambient air temperature and the total starting crank time; and display an alert to a user based on at least one of the score of the engine starting system or the comparison result from the relationship between the ambient air temperature and the total starting crank time.

A system for a vehicle having an engine and a battery includes a memory and a controller. The memory has a first current expected to be provided by the battery for restarting the engine during a warm cranking event and a second current expected to be provided by the battery for restarting the engine during a cold cranking event. The controller to predict a first minimum voltage of the battery expected during the warm cranking event based on the first current and a second minimum voltage of the battery expected during the cold cranking event based on the second current.

A first power supply line and a second power supply line are connected to a load device. A power-supply control device supplies power of a first electrical storage device to the load device via the first power supply line. The power-supply control device supplies power of a second electrical storage device to the load device via the second power supply line. A fuse and a relay of the power-supply control device constitute a first current path between the first electrical storage device and the load device. A fuse and a relay of the power-supply control device constitute a second current path between the second electrical storage device and the load device. A control circuit detects the direction of current on the first current path and the second current path, and detects whether there is a short-circuit between the first power supply line and the second power supply line.

In a system that shares a battery with an external device, the system includes a power storage device connected to the battery via a power supply line. The system includes a switch provided on the power supply line, and a control unit. The control unit controls on-off switching operations of the switch to selectively establish an electrical conduction between the battery and the power storage device or interrupt the electrical conduction therebetween. The battery has a battery voltage thereacross, and the power storage device has a power-storage voltage thereacross. The battery charges the power storage device while the electrical conduction is established so that the power-storage voltage follows the battery voltage. The control unit turns off the switch when the battery voltage is in a predetermined insufficient voltage state to prevent electrical power charged in the power storage device from being discharged to the battery.

An apparatus for controlling a start of an engine may include the engine, a first motor connected to a crankshaft by a first connecting device to start the engine, a main battery supplying a start power to the first motor, a controller configured to monitor components of a vehicle according to a start command for the engine to generate diagnostic information and generating a reverse charging control command to supply the reverse charging power to the main battery as the determination result of the diagnostic information, and an auxiliary battery supplying the reverse charging power to the main battery according to the reverse charging control command.

An apparatus includes a stop/start module in operative communication with an engine. The stop/start module structured to determine whether a stopping event has occurred, determine whether an inhibiting condition is activated, turn off the engine for at least a portion of time in response to determining that a stopping event has occurred, and determine an actual stop ratio for the engine based on a number of times the engine is turned off in response to determining the occurrences of stopping events. Turning off the engine is inhibited in response to determining that an inhibiting condition is activated. The inhibiting condition is activated based on the actual stop ratio for the engine being greater than a target stop ratio at a beginning of a driving event. The target stop ratio is based on an operating parameter.

An engine diagnosis system (1) is provided with: a data collection device (11) that collects data relating to an operation situation of an engine E or an engine starting device ST; a data relay device (12) that processes the collected data; and a data analysis device (13) that analyzes the processed data.

A starting control method for a vehicle having an engine may include determining, by an ECU, whether engine RPM rises when the engine is started, determining whether combustion-related parts are normal, when the engine RPM does not rise over a starter RPM, determining whether a cam position sensor and a crank position sensor are normal, when it is determined that the combustion-related parts are normal, performing control to offset a recognized crank angle by 360 degrees, when it is determined that the cam position sensor and the crank position sensor are normal, and restarting the engine based on the offset crank angle.

In an example, a vehicle diagnostic system is disclosed. The vehicle diagnostic system includes a first DC-DC converter having an input and an output and a second DC-DC converter having an input and an output. The output of the first DC-DC converter is connected to the input of the second DC-DC converter at a first node, and the output of the second DC-DC converter is connected to the input of the first DC-DC converter at a second node. The vehicle diagnostic system includes a battery connected to a vehicle load and the first node and a redundant power source connected to the second node. The vehicle diagnostic system includes a control module that is configured to initiate operation of the first DC-DC converter and the second DC-DC converter to cause current re-circulation between the first DC-DC converter and the second DC-DC converter.

A retrofit engine start/stop control system includes a programmable logic controller, an engine block temperature sensor to measure an external engine temperature, an ambient temperature sensor, an ignition circuit connector, a battery voltage sensor and an engine speed sensor. The programmable logic controller includes computer executable instructions to start the engine when at least one of an external engine block temperature, an ambient air temperature and a battery output voltage fall below a predefined threshold value for startup. A related method for retrofit engine start/stop idle control includes activating a programmable logic controller to control stop and start and idle control functions of an internal combustion engine; measuring an engine block temperature, ambient temperature, and battery system voltage; determining if all of the monitored values exceed corresponding predetermined threshold values for shutdown; and shutting down the engine if all of the monitored values exceed corresponding predetermined threshold values.