CONTROL SYSTEM OF HYBRID VEHICLE

• US 20190322269A1
• Filed: 02/19/2019
• Published: 10/24/2019
• Est. Priority Date: 04/19/2018
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: SASAKI, Keisuke, TSUDA, Satoshi, KATO, Naoto
• Granted Patent: US 11,167,745 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A control system of a hybrid vehicle includes an internal combustion engine loaded on a vehicle, an electric motor loaded on the vehicle, and connected to wheels via a power transmission mechanism, a battery storing power that drives the electric motor, and a control device that controls engine torque generated by the internal combustion engine, and motor torque transmitted to the wheels by the electric motor. The control device calculates an outputable power of the battery based on a temperature and a state of charge of the battery. The control device is configured to make a torque change amount of the engine torque larger when the calculated outputable power belongs to a predetermined low power region than when the outputable power belongs to a high power region with higher power than the low power region.

Claims

1. A control system of a hybrid vehicle comprising:

an internal combustion engine loaded on a vehicle;

an electric motor loaded on the vehicle and connected to wheels via a power transmission mechanism;

a battery that stores power that drives the electric motor; and

a control device that controls engine torque generated by the internal combustion engine, and motor torque that is transmitted to the wheels by the electric motor, based on a request driving force requested for the vehicle,

wherein the control device is configured to calculate an outputable power of the battery based on a temperature of the battery and a state of charge of the battery, and to make a torque change amount of the engine torque larger when the outputable power belongs to a predetermined low power region than when the outputable power belongs to a high power region with a higher power than the low power region.

2. The control system of a hybrid vehicle according to claim 1,

wherein the control device is configured to compensate torque, which becomes insufficient by the engine torque, by the motor torque so that a driving force of the vehicle is brought close to the request driving force.

3. The control system of a hybrid vehicle according to claim 1,

wherein the battery has a characteristic in that as the temperature of the battery becomes larger, the outputable power has a larger value.

4. The control system of a hybrid vehicle according to claim 1,

wherein the battery has a characteristic in that as the state of charge of the battery is larger, the outputable power has a larger value.

5. The control system of a hybrid vehicle according to claim 1,

wherein the control device is configured to make a torque change amount of the engine torque smaller when the outputable power is larger than a prescribed determination value than when the outputable power is smaller than the determination value.

6. The control system of a hybrid vehicle according to claim 1,

wherein the control device is configured to make a torque change amount of the engine torque smaller as the outputable power becomes larger.

7. The control system of a hybrid vehicle according to claim 1,

wherein the control device is configured to make a torque change amount of the engine torque be a fixed positive value when the outputable power is larger than a prescribed determination value.

8. The control system of a hybrid vehicle according to claim 1,

wherein the control device is configured to fix a torque change amount of the engine torque to zero when the outputable power is larger than a prescribed determination value.