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JP-2026075812-A - Vehicle control system

JP2026075812AJP 2026075812 AJP2026075812 AJP 2026075812AJP-2026075812-A

Abstract

[Problem] To provide a vehicle control device that can properly ventilate the inside of the crankcase. [Solution] The control device 1 has a processing circuit 1A. The internal combustion engine 10 has a ventilation system. The ventilation system has a first passage R1, a second passage R2, and a first PCV valve 51E. The first passage R1 connects the crankcase 14 to the downstream portion of the throttle valve 39 in the intake passage R IN . The second passage R2 connects the crankcase 14 to the portion between the compressor 37A and the electric supercharger 36 in the intake passage R IN . The first PCV valve 51E is provided in the first passage R1. The first PCV valve 51E opens when the intake pressure PIM becomes lower than the pressure inside the crankcase 14. The processing circuit 1A operates the electric supercharger 36 if the intake pressure PIM remains at or near atmospheric pressure for a set time. [Selection Diagram] Figure 1

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 throttle valve provided in the intake passage of the internal combustion engine, a compressor provided upstream of the throttle valve in the intake passage, and an electric supercharger provided further upstream of the compressor in the intake passage. The internal combustion engine has a ventilation system for ventilating the inside of the crankcase, The ventilation system includes a first passage connecting 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 between the compressor and the electric supercharger, The first one-way valve is provided in the first passage and 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 activate the electric supercharger when the intake pressure remains at or near atmospheric pressure for a set period of time.
  2. The ventilation system includes a third passage that connects the crankcase and the portion of the intake passage downstream of the throttle valve, The vehicle control device according to claim 1, further comprising a second one-way valve provided in the third passage, the second one-way valve which opens when the intake pressure becomes higher than the pressure inside the crankcase.
  3. The vehicle control device according to claim 1 or 2, wherein the processing circuit is configured to control the throttle valve to the closed side in order to suppress the increase in intake air volume associated with the operation of the electric supercharger when the electric supercharger is operated to ventilate the crankcase.
  4. The intake passage includes an intake manifold that introduces air into the combustion chamber of the internal combustion engine. The intake manifold has an intake pressure sensor configured to detect the pressure inside the intake manifold, The vehicle control device according to claim 1 or claim 2, wherein the intake pressure is the pressure inside the intake manifold detected by the intake pressure sensor.
  5. The vehicle control device according to claim 1 or 2, wherein the fuel for the internal combustion engine is hydrogen.

Description

This invention relates to a vehicle control device. In vehicle internal combustion engines, blow-by gas can leak into the crankcase through the gap between the piston and cylinder. Therefore, for example, the control device for an internal combustion engine described in Patent Document 1 utilizes the negative pressure in the intake manifold to ventilate the crankcase. Japanese Patent Publication No. 2024-076657 This is a schematic diagram showing the configuration of an internal combustion engine according to one embodiment.This is a flowchart showing the procedure for ventilation processing performed by a control device according to one 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 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 for discharging exhaust gas discharged from the combustion chamber 17 of the internal combustion engine 10 and has an exhaust pipe 33. The first end of the exhaust pipe 33 is connected to the downstream part of the exhaust port 19. The second end of the exhaust pipe 33 is open to the atmosphere via the exhaust system. The intake manifold 31 is connected to the upstream portion of the intake port 18. The upstream portion is the part of the intake port 18 opposite the combustion chamber 17. The intake manifold 31 is equipped with an intake pressure sensor 34. The intake pressure sensor 34 detects the intake pressure PIM . The intake pressure PIM is the pressure inside the intake manifold 31. The intake pipe 32 is connected to the upstream portion of the intake manifold 31. The upstream portion is the part of the intake manifold 31 opposite the intake port 18. The intake manifold 32 includes an air cleaner 35, an electric supercharger 36, a turbocharger 37, an intercooler 38, and a throttle valve 39. The air cleaner 35, electric supercharger 36, turbocharger 37, intercooler 38, and throttle valve 39 are arranged in that order from the upstream side of the intake manifold 32. The air cleaner 35 filters the air taken into the intake pipe 32. The electric supercharger 36 assists in providing the pressure necessary for supercharging. Supercharging is the process of compressing air to increase its density and introducing it into the cylinder 15 of the internal combustion engine 10. The electric supercharger 36 has a motor and a compressor driven by the motor. The compressor compresses the air in the intake manifold 32. The turbocharger 37 is a device that supercharges the internal combustion engine 10 using exhaust gas from the engine as a power source. The t