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JP-2026075814-A - Vehicle control system

JP2026075814AJP 2026075814 AJP2026075814 AJP 2026075814AJP-2026075814-A

Abstract

[Problem] To provide a vehicle control device that can properly ensure the starting performance of an internal combustion engine. [Solution] The vehicle control device has a processing circuit. The vehicle is equipped with an internal combustion engine, a starter, a throttle valve, and an electric supercharger. The internal combustion engine has a first passage, a second passage, and a one-way valve. The first passage connects the crankcase to the downstream portion of the intake passage beyond the throttle valve. The second passage connects the crankcase to the upstream portion of the intake passage beyond the throttle valve and downstream of the electric supercharger. The one-way valve is provided in the first passage. The one-way valve opens when the intake pressure, which is the pressure downstream of the throttle valve in the intake passage, becomes lower than the pressure inside the crankcase. When the internal combustion engine is started in a low-temperature environment, the processing circuit operates the electric supercharger by closing the throttle valve while cranking the internal combustion engine with the starter (S103, S104, S105). [Selection Diagram] Figure 2

Inventors

  • 中渡瀬 明

Assignees

  • トヨタ自動車株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (5)

  1. A vehicle control device having a processing circuit, The vehicle comprises an internal combustion engine having a crankcase, a starter for starting the internal combustion engine, a throttle valve provided in an intake passage for introducing air into the combustion chamber of the internal combustion engine, and an electric supercharger provided upstream of the throttle valve in the intake passage. The internal combustion engine includes a first passage that connects the crankcase and the portion of the intake passage downstream of the throttle valve, A second passage connecting the crankcase and the portion of the intake passage upstream of the throttle valve and downstream of the electric supercharger, The system includes a one-way valve provided in the first passage, which opens when the intake pressure, which is the pressure downstream of the throttle valve in the intake passage, becomes lower than the pressure inside the crankcase, The processing circuit is a vehicle control device configured to perform a first process in which, when the internal combustion engine is started in a low-temperature environment, the starter cranks the internal combustion engine while closing the throttle valve and operating the electric supercharger.
  2. The vehicle control device according to claim 1, wherein the processing circuit 1A is configured to perform a second process of opening the throttle valve and operating the electric supercharger after the first process is completed.
  3. The vehicle control device according to claim 1 or 2, wherein the processing circuit is configured to execute the first processing only when a starting failure of the internal combustion engine occurs in a low-temperature environment.
  4. The vehicle control device according to claim 1 or 2, wherein the fuel for the internal combustion engine is hydrogen.
  5. A vehicle control device having a processing circuit, The vehicle comprises an internal combustion engine having a crankcase, a starter for starting the internal combustion engine, a throttle valve provided in an intake passage for introducing air into the combustion chamber of the internal combustion engine, and an electric supercharger provided upstream of the throttle valve in the intake passage. The internal combustion engine has a passage that connects the crankcase and the portion of the intake passage upstream of the electric supercharger, The processing circuit is a vehicle control device configured to open the throttle valve and activate the electric supercharger when the internal combustion engine is started in a low-temperature environment.

Description

This invention relates to a vehicle control device. Conventionally, there are vehicle control systems that, when stopping an internal combustion engine in a cold state, scavenge the combustion chamber before stopping the engine. A cold state is when the temperature of the internal combustion engine is below the ambient temperature. For example, the vehicle control system described in Patent Document 1 performs a scavenging process that motorizes the internal combustion engine while stopping fuel injection when stopping the engine in a cold state. Scavenging is performed to remove moisture from the combustion chamber and prevent problems caused by moisture remaining in the combustion chamber while the internal combustion engine is stopped. These problems include, for example, spark plug freezing. By stopping the internal combustion engine after scavenging is complete, problems caused by residual moisture in the combustion chamber are suppressed. Therefore, the starting performance of the internal combustion engine can be ensured. Japanese Patent Publication No. 2018-039347 This is a schematic diagram showing the configuration of an internal combustion engine according to one embodiment.This flowchart shows the procedure for the first processing step among the pre-startup processing performed by the control device according to one embodiment.This is a schematic diagram of an internal combustion engine showing the gas flow when a control device according to one embodiment is performing a first process as part of the pre-startup process.This flowchart shows the procedure for the second processing step among the pre-startup processing performed by the control device according to one embodiment.This is a schematic diagram of an internal combustion engine showing the gas flow when a control device according to one embodiment is performing a second process in the pre-startup process.This is a schematic diagram showing the configuration of an internal combustion engine according to another embodiment. The following describes one embodiment of a vehicle control device. As shown in Figure 1, the control device 1 controls the vehicle. The vehicle is equipped with an internal combustion engine 10. The internal combustion engine 10 is the power source of the vehicle and uses hydrogen as fuel, for example. The internal combustion engine 10 has a cylinder block 11, a cylinder head 12, a head cover 13, and a crankcase 14. The cylinder block 11 comprises multiple cylinders 15 and multiple pistons 16. For the sake of explanation, only one cylinder 15 and one piston 16 are shown in Figure 1. The cylinder 15 is a space located inside the cylinder block 11 and has a circular cross-sectional shape. The piston 16 is a cylindrical body with a circular cross-sectional shape and is housed inside the cylinder 15 so as to be able to reciprocate. The cylinder head 12 is located on the upper part of the cylinder block 11. The cylinder head 12 has a combustion chamber 17, an intake port 18, and an exhaust port 19. The combustion chamber 17 is the space where combustion takes place in the internal combustion engine 10, and is formed by the cylinder block 11, the cylinder head 12, and the piston 16. The intake port 18 introduces intake air into the combustion chamber 17. An intake valve 20 is provided in the intake port 18. The exhaust port 19 discharges exhaust gas from the combustion chamber 17. An exhaust valve 21 is provided in the exhaust port 19. The cylinder head 12 has a spark plug 22. The spark plug 22 is a device that ignites the mixture of fuel injected into the combustion chamber 17 from a fuel injector (not shown) and air introduced into the combustion chamber 17 from an intake port 18. The fuel injector is provided in the cylinder head 12. The fuel injected from the fuel injector is, for example, hydrogen. The head cover 13 is located on the upper part of the cylinder head 12. The head cover 13 is a hollow body that covers the upper part of the cylinder head 12. The crankcase 14 is located at the bottom of the cylinder block 11. The crankcase 14 houses the crankshaft (not shown). The crankshaft is connected to the piston 16 via a connecting rod (not shown). The crankshaft rotates in conjunction with the reciprocating motion of the piston 16. The vehicle is equipped with a starter 23. The starter 23 is a device for starting the internal combustion engine 10. The starter 23 is, for example, a motor, and is connected to the crankshaft in a manner that allows power to be transmitted. When starting the internal combustion engine 10, the starter 23 rotates the crankshaft to a level at which the internal combustion engine 10 can operate independently. The vehicle has an intake passage R IN and an exhaust passage R OUT . The intake passage R IN is a passage for introducing air into the combustion chamber 17 of the internal combustion engine 10 and has an intake manifold 31 and an intake pipe 32. The exhaust passage R OUT is a passage