VEHICLE CONTROL SYSTEM
First Claim
1. A vehicle control system for a hybrid vehicle comprising:
- an engine for producing a driving force for the hybrid vehicle;
a motor-generator for generating electric power when the motor-generator is driven to rotate by the engine;
an electric-power charging device connected to the motor-generator for charging the electric power generated at the motor-generator and for supplying the electric power to an electric load of an accessory device mounted to the hybrid vehicle; and
a control device for controlling an operation of the engine, wherein the control device includes;
a first portion for obtaining information of cooling water temperature, which is temperature of cooling water for the engine;
a second portion for obtaining information of a charging state of the electric-power charging device; and
a third portion for calculating an engine operating point including engine rotational speed and engine torque,wherein the third portion operates the engine in a first operating mode when the cooling water temperature is lower than a predetermined temperature and the charging state of the electric-power charging device has a remaining charging capacity,in the first operating mode, the third portion calculates such engine rotational speed and engine torque based on the charging state of the electric-power charging device, which realize such engine operation according to which a fuel consumption amount for a unit amount of electric power to be charged into the electric-power charging device is minimized,the third portion operates the engine in a second operating mode when the cooling water temperature is lower than the predetermined temperature and the charging state of the electric-power charging device has no remaining charging capacity, andin the second operating mode, the third portion calculates such engine rotational speed and engine torque, which realize such engine operation according to which minimum electric power is generated by the motor-generator, wherein the minimum electric power satisfies at least electric power to be consumed by the electric load of the accessory device mounted to the hybrid vehicle.
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Accused Products
Abstract
A hybrid control device calculates engine rotational speed and engine torque based on cooling water temperature for an engine and a charging state of a main battery. The hybrid control device operates the engine in a maximum charging efficiency mode, when the cooling water temperature is lower than a target temperature value and the main battery has a remaining charging capacity. In the maximum charging efficiency mode, the hybrid control device calculates such engine rotational speed and engine torque, which realize engine operation according to which a fuel consumption amount for a unit amount of charging electric power is minimized. As a result, efficiency of a vehicle control system is improved as a whole, to thereby improve fuel consumption ratio.
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Citations
4 Claims
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1. A vehicle control system for a hybrid vehicle comprising:
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an engine for producing a driving force for the hybrid vehicle; a motor-generator for generating electric power when the motor-generator is driven to rotate by the engine; an electric-power charging device connected to the motor-generator for charging the electric power generated at the motor-generator and for supplying the electric power to an electric load of an accessory device mounted to the hybrid vehicle; and a control device for controlling an operation of the engine, wherein the control device includes; a first portion for obtaining information of cooling water temperature, which is temperature of cooling water for the engine; a second portion for obtaining information of a charging state of the electric-power charging device; and a third portion for calculating an engine operating point including engine rotational speed and engine torque, wherein the third portion operates the engine in a first operating mode when the cooling water temperature is lower than a predetermined temperature and the charging state of the electric-power charging device has a remaining charging capacity, in the first operating mode, the third portion calculates such engine rotational speed and engine torque based on the charging state of the electric-power charging device, which realize such engine operation according to which a fuel consumption amount for a unit amount of electric power to be charged into the electric-power charging device is minimized, the third portion operates the engine in a second operating mode when the cooling water temperature is lower than the predetermined temperature and the charging state of the electric-power charging device has no remaining charging capacity, and in the second operating mode, the third portion calculates such engine rotational speed and engine torque, which realize such engine operation according to which minimum electric power is generated by the motor-generator, wherein the minimum electric power satisfies at least electric power to be consumed by the electric load of the accessory device mounted to the hybrid vehicle.
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2. A vehicle control system for a hybrid vehicle comprising:
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an engine for producing a driving force for the hybrid vehicle; a motor-generator for generating electric power when the motor-generator is driven to rotate by the engine; an electric-power charging device connected to the motor-generator for charging the electric power generated at the motor-generator and for supplying the electric power to an electric load of an accessory device mounted to the hybrid vehicle; and a control device for controlling an operation of the engine, wherein the control device includes; a first portion for obtaining information of cooling water temperature, which is temperature of cooling water for the engine; a second portion for obtaining information of a charging state of the electric-power charging device; and a third portion for calculating an engine operating point based on a current cooling water temperature, a target temperature value for the cooling water temperature, a current charging-state value of the electric-power charging device and a target charging-state value for the charging state of the electric-power charging device, wherein the engine operating point includes engine rotational speed and engine torque. - View Dependent Claims (3, 4)
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Specification